A perchlorate-based fe(ii) spin crossover material and a preparation method and application thereof

Abstract

The application discloses a Fe(II) spin crossover material based on perchlorate, and a preparation method and application thereof. The application adopts a room temperature volatilization method to prepare [Fe(bamp)2]·(ClO4)2 with a higher yield, and compared with a high-temperature and high-pressure solvothermal synthesis method and a poor solvent solvent diffusion method, the method has the advantages of simple reaction condition and easy realization. The organic ligand 2,6-bis(amino methyl) pyridine has rich benzene groups and amino groups, and is easy to construct a pi-pi stacking and hydrogen bonding to finely control spin transition properties; meanwhile, ClO4 ‑ The control enhances the pi-pi intermolecular stacking effect, and under the synergistic action of the two, the material appears spin transition behavior. The Fe(II) spin crossover magnetic material has the characteristics of cheap raw materials, stable structure and performance, and the synthesized spin crossover material can be applied to the fields of molecular switch, molecular sensor and ultra-high density information storage.

Description

Technical Field

[0001] This invention belongs to the field of new materials technology, specifically relating to a perchlorate-based Fe(II) spin-crossing material and its preparation method and application. Background Technology

[0002] Spin-crossing materials are currently a hot topic in magnetic research. Spin transitions are often accompanied by changes in spin state, structure, magnetism, and color, thus offering broad applications in micro / nanomaterials such as molecular sensors, molecular switches, information storage, and displays. When spin transitions occur near room temperature, they can be applied to computer information storage and room-temperature molecular switches. However, most spin-crossing compounds have transition temperatures below room temperature, making their practical application difficult. Therefore, synthesizing compounds with room-temperature spin transitions and broad hysteresis loops remains essential. While dozens of room-temperature spin-crossing complexes have been reported, only a handful are practically applicable. Spin transitions require a suitable ligand field strength; generally, strong fields favor low-spin states, while weak fields favor high-spin states. Counter anions in the crystal lattice, ligand substituents, and crystallization solvent molecules can all significantly influence coordination synergy, leading to gradual, abrupt, and hysteresis changes in the metal spin center.

[0003] Counter anions significantly influence the coordination coordination of spin transitions, with different anions potentially leading to varying crystal packing and hydrogen bonding patterns. One study reported a mononuclear Fe(II) spin transition complex, [Fe(2-pic)3]·A2·Solv, containing three different anions: m-aminobenzenesulfonic acid, p-aminobenzenesulfonic acid, and trifluoromethanesulfonic acid, and 1-pic = 2-picolylamine. The different counter anion complexes exhibit distinct packing structures due to hydrogen bonding, significantly impacting the coordination coordination of the spin transition center and modulating its temperature, type, and hysteresis width. However, the rational design and precise control of these intermolecular interactions remain a considerable challenge. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0006] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art, provide a perchlorate-based Fe(II) spin crossover material, wherein the chemical structural formula of the Fe(II) spin crossover material is [Fe(bamp)2]·(ClO4)2;

[0007] In the formula, bamp represents 2,6-bis(aminomethyl)pyridine;

[0008] The crystal structure of the Fe(II) spin crossover material is monoclinic, the space group is P21 / c, and the cell parameters are respectively: α=90°, β=98.688(2)°, γ=90°, and the Fe-N bond length ranges from

[0009] Another purpose of the present application is to overcome the deficiencies in the prior art, provide a preparation method of the perchlorate-based Fe(II) spin crossover material.

[0010] To solve the above technical problems, the present application provides the following technical solutions:

[0011] The preparation method is carried out under anaerobic conditions, comprising,

[0012] 2,6-bis(aminomethyl)pyridine is added to a hot solvent to obtain solution I;

[0013] Perchlorate and ferrous salt are added to the hot solvent to obtain solution II;

[0014] Solution II is added to solution I, and then stirred, filtered, and volatilized in sequence, and the deep red crystals precipitated are the Fe(II) spin crossover material.

[0015] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material, wherein: the hot solvent is a solvent deoxygenated by passing nitrogen for 12-24 hours, and the temperature is 30-60℃.

[0016] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material, wherein: the hot solvent is obtained by mixing one or two of deionized water, methanol or ethanol.

[0017] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material, wherein: when the hot solvent is obtained by mixing two solvents, the volume ratio of the two solvents is 1:0.25-4.

[0018] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material according to the present application, in the solution II, the concentration of the perchlorate is 0.15-0.35 mol / L.

[0019] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material according to the present application, the molar ratio of the 2,6-bis(amino methyl) pyridine and the perchlorate is 2:1-1.2, and the molar ratio of the perchlorate and the ferrous salt is 1-2:1.

[0020] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material according to the present application, the perchlorate includes one or both of ferrous perchlorate and sodium perchlorate.

[0021] As a preferred scheme of the preparation method of the perchlorate-based Fe(II) spin crossover material according to the present application, the ferrous salt includes one or both of ferrous perchlorate and ferrous chloride.

[0022] It is another object of the present application to overcome the deficiencies in the prior art and provide the application of the perchlorate-based Fe(II) spin crossover material in information storage and molecular switch.

[0023] The present application has the following advantages:

[0024] (1) The method for preparing the material at room temperature according to the present application has the advantages of simple reaction conditions and easy implementation compared with the high-temperature and high-pressure solvothermal synthesis and the poor solvent solvent diffusion method.

[0025] (2) The organic ligand 2,6-bis(amino methyl) pyridine in the present application has rich phenyl groups and amino groups, which are easy to construct π-π stacking and hydrogen bonding to finely control the spin transition properties; at the same time, the ClO4 - The control enhances the π-π intermolecular stacking effect, and the synergistic effect makes the material exhibit spin transition behavior.

[0026] (3) The present application realizes a higher yield of [Fe(bamp)2]·(ClO4)2 by exploring the influence of the type and temperature of the solvent and the addition amount of ferrous perchlorate on the yield of the Fe(II) spin crossover magnetic material [Fe(bamp)2]·(ClO4)2.

[0027] (4) The Fe(II) spin crossover magnetic material [Fe(bamp)2]·(ClO4)2 disclosed in the present application has the characteristics of cheap raw materials and stable structure and performance, and the synthesized spin crossover material can be applied in the fields of molecular switch and information storage. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings. Among them:

[0029] Figure 1 The crystal structure diagram of [Fe(bamp)2]·(ClO4)2 in the embodiment 1 of the present application.

[0030] Figure 2 The crystal structure diagram stacking diagram of [Fe(bamp)2]·(ClO4)2 in the embodiment 1 of the present application.

[0031] Figure 3 The powder X-ray diffraction diagram of [Fe(bamp)2]·(ClO4)2 in the embodiment 1 of the present application.

[0032] Figure 4 The variable temperature magnetization curve diagram of [Fe(bamp)2]·(ClO4)2 in the embodiment 1 of the present application. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail in the following with reference to the embodiments of the specification.

[0034] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0035] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or selective embodiment which is mutually exclusive with other embodiments.

[0036] The reagents used in the present application are commercially available and are of analytical purity. Except for the solvent which is subjected to deoxygenation treatment, the other reagents are not subjected to further purification before use.

[0037] Embodiment 1

[0038] The present embodiment provides a preparation method of Fe(II) spin crossover magnetic material:

[0039] Deionized water at 60°C was charged into a Schlenk flask, and nitrogen was blown into the solvent through a gas guide tube for 24 hours to obtain an oxygen-free water solvent.

[0040] In the glove box, 0.6 mmol of organic ligand bamp (2,6-bis(aminomethyl)pyridine) was added to 2 mL of oxygen-free water solvent, and stirred to dissolve.

[0041] Then in the glove box, 0.35 mmol of ferrous perchlorate was added to 2 mL of water and stirred to dissolve, note that ferrous perchlorate needs to be weighed with a plastic spoon.

[0042] The ferrous perchlorate aqueous solution was slowly added to the organic ligand solution, and stirred at room temperature 25°C for 10 minutes. Filtration, static evaporation, and after two weeks, deep red block crystals suitable for X-ray diffraction were obtained, which was the divalent iron complex [Fe(bamp)2]·(ClO4)2.

[0043] The yield of [Fe(bamp)2]·(ClO4)2was 68%.

[0044] The [Fe(bamp)2]·(ClO4)2prepared in Example 1 was specifically characterized as follows:

[0045] (1) Crystal structure determination. The instrument used for single crystal testing was Apex Duo single crystal diffractometer, and the radiation source was Mo-Kα ray of graphite monochromator. The single crystal analysis data are shown in Table 1.

[0046] Table 1 Crystal data and structure refinement parameters of complex [Fe(bamp)2] system

[0047]

[0048]

[0049] Based on the test results of the crystal structure parameters in Table 1, Figure 1 And Figure 2 is the molecular structure of the complex [Fe(bamp)2]·(ClO4)2. The complex [Fe(bamp)2]·(ClO4)2belongs to a monoclinic system, and the space group is P21 / c. In the minimum asymmetric unit of the complex [Fe(bamp)2]·(ClO4)2, there are 2 [Fe(bamp)2] 2+ cationic centers, four ClO4 - anions. The Fe 2+ metal center is coordinated with two organic ligands through six coordination nitrogen atoms to form a distorted octahedral structure.

[0050] The octahedral configuration can be calculated by SHAPE 2.1 for the coordination environment of the metal center, as shown in Table 2, both of the two six-coordinated Fe(II) metal centers tend to be octahedral configuration. As can be seen from the packing structure, there is a face-to-face π-π stacking interaction between the phenyl groups of the ligand bamp, and the center-to-center distance is The dihedral angle is 2.56°, close to parallel.

[0051] Table 2 Fe 2+ Part of the calculation data of ionic coordination configuration

[0052]

[0053] Note: HP is hexagonal, PPY is pentagonal pyramid, OC is octahedral, TPR is triangular prism, and JPPY is Johnson pentagonal pyramid.

[0054] Table 3 is the coordination bond length of the metal center in the complex [Fe(bamp)2] system.

[0055] Table 3 is the coordination bond length of the metal center in the complex [Fe(bamp)2] system.

[0056]

[0057] As can be seen from Table 3, the Fe1-N coordination bond length is The Fe2-N coordination bond length is between , indicating that Fe1 and Fe2 are relatively long at 298K temperature, corresponding to the high spin state of Fe(II) ion.

[0058] (2) Powder X-ray diffraction determination of phase purity

[0059] The phase purity of the crystal product obtained in the embodiment was characterized by Rigaku MiniFlex 600c powder X-ray diffractometer, and the theoretical data was obtained by simulating the single crystal structure by Mercury software, and the results are shown in Figure 3 As can be seen, the experimental value of the diffraction peak of the complex obtained in the embodiment is very consistent with the diffraction peak simulated by the single crystal structure, indicating that the material has high phase purity.

[0060] (3) Magnetic performance characterization

[0061] The magnetic measurement was carried out by using superconducting quantum interference device Quantum Design MPMS SQUID VSM magnetic measurement system, and the diamagnetic correction was processed by Pascal constant. The test temperature of direct current magnetization rate was 2-300K, and the magnetic field was 1000Oe, and the polycrystalline sample was tested in different temperature range, such as Figure 4The spin crossover phenomenon of complex [Fe(bamp)2] · (ClO4)2 was observed. At 300 K, χ M The T value is 3.24, close to the high spin theoretical value 3 cm 5 of the six-coordinated divalent iron (Fe(II) high spin state 3 mol -1 K. As the temperature was cooled from 300 K to 50 K, χ M T value of the polycrystalline complex [Fe(bamp)2] · (ClO4)2 gradually decreased to 1.78 cm 3 mol -1 K, realizing a partial spin crossover behavior, and the transition temperature was 134 K. When the temperature was lower than 45 K, the value of the magnetic susceptibility continued to decrease, which was due to the influence of high spin zero field splitting rather than further spin crossover.

[0062] This example uses simple room temperature stirring in an oxygen-free environment to synthesize a spin crossover crystal material with π-π stacking structure from (2,6-bis(aminomethyl)pyridine) and ferrous perchlorate in deionized water.

[0063] Example 2

[0064] This example provides a method for preparing a Fe(II) spin crossover magnetic material:

[0065] Methanol at 40°C and deionized water at 60°C were respectively filled into a Schlenk flask, and nitrogen was blown into the solvent through a gas guide pipe for 24 hours to obtain an oxygen-free solvent.

[0066] In the glove box, 0.6 mmol of organic ligand bamp (2,6-bis(aminomethyl)pyridine) was added to 2 mL of oxygen-free methanol and deionized water mixed solvent (volume ratio 1:1), and stirred to dissolve.

[0067] Then in the glove box, 0.3 mmol of ferrous perchlorate salt was added to 2 mL of water and stirred to dissolve. Note that ferrous perchlorate needs to be weighed with a plastic spoon.

[0068] The above obtained ferrous perchlorate aqueous solution was slowly added to the organic ligand solution, and stirred at room temperature 25°C for 10 minutes. Filtration, static evaporation, and after two weeks, deep red block crystals suitable for X-ray diffraction were precipitated, which was the divalent iron complex [Fe(bamp)2] · (ClO4)2.

[0069] The yield of [Fe(bamp)2] · (ClO4)2 was 23%. The yield was significantly lower than that of Example 1.

[0070] Example 3

[0071] The present example provides a method for preparing a Fe(II) spin crossover magnetic material:

[0072] Deoxygenated solvents were obtained by bubbling nitrogen gas into ethanol at 50 °C and deionized water at 60 °C for 24 hours in a Schlenk flask.

[0073] In a glove box, 0.6 mmol of the organic ligand bamp (2,6-bis(aminomethyl)pyridine) was added to 2 mL of the deoxygenated ethanol and deionized water mixed solvent (1:1 by volume) and stirred to dissolve at room temperature.

[0074] Then in the glove box, 0.3 mmol of ferrous perchlorate was added to 2 mL of water and stirred to dissolve at room temperature. Note that the ferrous perchlorate needs to be weighed using a plastic spoon.

[0075] The above obtained ferrous perchlorate aqueous solution was slowly added to the organic ligand solution and stirred for 10 minutes at room temperature 25 °C. Filtration and static evaporation resulted in deep red block crystals suitable for X-ray diffraction after two weeks, which was the divalent iron complex [Fe(bamp)2]·(ClO4)2.

[0076] The yield of [Fe(bamp)2]·(ClO4)2was 12%. The yield was significantly lower than Example 1.

[0077] Example 4

[0078] The present example provides a method for preparing a Fe(II) spin crossover magnetic material:

[0079] Deoxygenated methanol was obtained by bubbling nitrogen gas into methanol at 40 °C for 24 hours in a Schlenk flask.

[0080] In a glove box, 0.6 mmol of the organic ligand bamp (2,6-bis(aminomethyl)pyridine) was added to 2 mL of the deoxygenated methanol and stirred to dissolve.

[0081] Then in the glove box, 0.3 mmol of ferrous perchlorate was added to 2 mL of deoxygenated methanol and stirred to dissolve. Note that the ferrous perchlorate needs to be weighed using a plastic spoon.

[0082] The above obtained ferrous perchlorate solution was slowly added to the organic ligand solution and stirred for 10 minutes at room temperature 25 °C. Filtration and static evaporation resulted in deep red block crystals suitable for X-ray diffraction after two weeks, which was the divalent iron complex [Fe(bamp)2]·(ClO4)2.

[0083] [Fe(bamp)2]·(ClO4)2yield 34%.

[0084] Example 5

[0085] This example provides a preparation method of Fe(II) spin crossover magnetic material:

[0086] Fill the Schlenk flask with ethanol at 40°C, and bubble nitrogen into the solvent through the gas inlet tube for 24 hours to obtain oxygen-free ethanol.

[0087] In the glove box, 0.6 mmol of organic ligand bamp (2,6-bis(aminomethyl)pyridine) is added to 2 mL of oxygen-free ethanol and stirred to dissolve.

[0088] Then in the glove box, 0.3 mmol of ferrous perchlorate salt is added to 2 mL of oxygen-free ethanol and stirred to dissolve. Note that ferrous perchlorate needs to be weighed with a plastic spoon.

[0089] The above-obtained ferrous perchlorate solution is slowly added to the organic ligand solution, and stirred at room temperature for 10 minutes. Filtration, static evaporation, and after two weeks, deep red block crystals suitable for X-ray diffraction are precipitated, which is the divalent iron complex [Fe(bamp)2]·(ClO4)2.

[0090] [Fe(bamp)2]·(ClO4)2yield 29%.

[0091] Example 6

[0092] This example provides a preparation method of Fe(II) spin crossover magnetic material:

[0093] Fill the Schlenk flask with deionized water at 60°C, and bubble nitrogen into the solvent through the gas inlet tube for 24 hours to obtain oxygen-free water solvent.

[0094] In the glove box, 0.6 mmol of organic ligand bamp (2,6-bis(aminomethyl)pyridine) is added to 2 mL of oxygen-free water solvent and stirred to dissolve at room temperature.

[0095] Then in the glove box, 0.3 mmol of ferrous perchlorate is added to 2 mL of water and stirred to dissolve at room temperature. Note that ferrous perchlorate needs to be weighed with a plastic spoon.

[0096] The above-obtained ferrous perchlorate aqueous solution is slowly added to the organic ligand solution, and stirred at room temperature for 10 minutes. Filtration, static evaporation, and after two weeks, deep red block crystals suitable for X-ray diffraction are precipitated, which is the divalent iron complex [Fe(bamp)2]·(ClO4)2.

[0097] [Fe(bamp)2]·(ClO4)2with a yield of 55%.

[0098] Example 7

[0099] The present example provides a method for preparing a Fe(II) spin crossover magnetic material:

[0100] Deionized water at 60°C was charged into a Schlenk flask, and nitrogen was bubbled into the solvent through a gas inlet tube for 24 hours to obtain an oxygen-free aqueous solvent.

[0101] In a glove box, 0.6 mmol of the organic ligand bamp (2,6-bis(aminomethyl)pyridine) was added to 2 mL of the oxygen-free aqueous solvent, and the solution was stirred to dissolve at room temperature.

[0102] Then in the glove box, 0.35 mmol of ferrous chloride and 0.7 mmol of sodium perchlorate were added to 2 mL of water, and the solution was stirred to dissolve at room temperature.

[0103] The above-obtained aqueous ferrous perchlorate solution was slowly added to the organic ligand solution, and the mixture was stirred for 10 minutes at room temperature. Filtration and static evaporation resulted in deep red block crystals suitable for X-ray diffraction after two weeks, which were the divalent iron complex [Fe(bamp)2]·(ClO4)2with a yield of 41%.

[0104] Comparative Example 1

[0105] The difference between the present comparative example and Example 1 is that no nitrogen bubbling was performed to remove oxygen.

[0106] After static evaporation for 1 day, the solution turned red, and no crystals were precipitated after the solvent was evaporated, i.e., the Fe(II) spin crossover magnetic material could not be successfully synthesized.

[0107] Comparative Example 2

[0108] The difference between the present comparative example and Example 1 is that all operations were performed in an outdoor fume hood.

[0109] After static evaporation for 1 day, the solution turned red and turbid, and no crystals were precipitated after the solvent was evaporated, i.e., the Fe(II) spin crossover magnetic material could not be synthesized.

[0110] Comparative Example 3

[0111] The difference between the present comparative example and Example 1 is that the amount of ferrous perchlorate was adjusted to 0.6 mmol, i.e., the molar ratio of bamp to ferrous perchlorate was 1:1, and the yield of the synthesized complex crystal material was extremely low, only 4%.

[0112] Comparative Example 4

[0113] The comparative example is different from example 1 in that the amount of ferrous perchlorate is adjusted to 0.2 mmol, that is, the molar ratio of bamp to ferrous perchlorate is 3:1, and the yield of the synthesized complex crystal material is extremely low, close to 0.

[0114] In summary, the method for preparing the material at room temperature volatilization has the advantages of simple reaction conditions and easy implementation compared with the methods such as high-temperature high-pressure solvothermal synthesis and poor solvent solvent diffusion. The organic ligand 2,6-bis(amino methyl) pyridine has rich phenyl groups and amino groups, which are easy to construct π-π stacking and hydrogen bonding to finely control the spin transition properties; at the same time, ClO4 - The regulation enhances the π-π intermolecular stacking interaction, and the synergistic effect of the two makes the material exhibit spin transition behavior; by exploring the effects of the types and temperatures of solvents and the amount of ferrous perchlorate on the yield of the Fe(II) spin crossover magnetic material [Fe(bamp)2]·(ClO4)2, a higher yield of [Fe(bamp)2]·(ClO4)2 is achieved. The Fe(II) spin crossover magnetic material [Fe(bamp)2]·(ClO4)2 of the present application has the characteristics of cheap raw materials, stable structure and performance, and the synthesized spin crossover material can be applied to the fields of molecular switches and information storage.

[0115] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A Fe(II) spin-crossing magnetic material based on perchlorate, characterized in that: The chemical structural formula of the Fe(II) spin-crossing magnetic material is [Fe(bamp)2]·(ClO4)2; In the formula, bamp represents 2,6-bis(aminomethyl)pyridine; The Fe(II) spin-crossing magnetic material has a monoclinic crystal system and a space group of . P 21 / c, with unit cell parameters of: a = 8.3368(9) Å, b = 30.301(3) Å, c = 17.388(2) Å, α = 90 o , β= 98.688(2) o ,γ= 90 o The Fe-N bond length ranges from 2.130(4) to 2.253(4) Å.

2. The method for preparing Fe(II) spin-crossed magnetic materials based on perchlorate as described in claim 1, characterized in that: The preparation method is carried out under anaerobic conditions and includes, 2,6-bis(aminomethyl)pyridine was added to a hot solvent to obtain solution I; Perchlorate and ferrous salt are added to a hot solvent to obtain solution II; Solution II is added to solution I, and after stirring, filtration, and evaporation, the precipitated deep red crystals are Fe(II) spin-crossing magnetic materials. The hot solvent is a solvent deoxygenated by purging nitrogen gas for 12-24 hours at a temperature of 30-60°C. The hot solvent is obtained by mixing one or two solvents selected from deionized water, methanol, or ethanol. When the hot solvent is obtained by mixing two solvents, the volume ratio of the two solvents is 1:0.25-4. The concentration of perchlorate in solution II is 0.15-0.35 mol / L. The molar ratio of 2,6-bis(aminomethyl)pyridine to perchlorate is 2:1-1.2, and the molar ratio of perchlorate to ferrous salt is 1-2:

1.

3. The preparation method according to claim 2, characterized in that: The perchlorate is selected from one or both of ferrous perchlorate and sodium perchlorate.

4. The preparation method according to claim 2, characterized in that: The ferrous salt is selected from one or both of ferrous perchlorate and ferrous chloride.

5. The application of the Fe(II) spin-crossed magnetic material based on perchlorate as described in claim 1 in information storage and molecular switches.

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