61 results about "Molecular magnets" patented technology

The invention discloses a method for preparing a single-molecular magnet [Dy2(saph)2(NO3)2(CH3OH)4] and relates to a method for preparing a single-molecular magnet. The invention aims at solving the problems that the synthetic method of the conventional rare earth complex single-molecular magnet is low in yield and the synthetic method of the complex is complicated. The method comprises the following steps: dissolving o-aminophenol salicylaldehyde in acetonitrile, thereby obtaining a solution A; dissolving dysprosium nitrate in methanol, thereby obtaining a solution B; mixing the solution A and the solution B, adding a triethylamine solution into the mixed solution, stirring under room temperature condition, thereby obtaining a preform; and volatilizing a solvent out of the preform, thereby obtaining the complex. The [Dy2(saph)2(NO3)2(CH3OH)4] prepared by the method disclosed by the invention is a single-molecular magnet with good ferromagnetic properties, the yield of the preparation method disclosed by the invention is high and is over 52.84 percent, and the synthetic method of the single-molecular magnet is simple and high in repeatability. The invention belongs to the field of preparation of single-molecular magnets.

The invention discloses a preparation method of a single-molecular magnet [Dy2(saph)2Cl2].4CH3OH and relates to the preparation method of the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH, which is used for solving the problems that an existing synthesis method for a rear-earth cluster compound single-molecular magnet is lower in yield, complex in synthesis method of a coordination compound and incapable of carrying out mass production. The preparation method comprises the following steps: I, dissolving o-aminophenol salicylaldehyde acetal into acetonitrile to obtain liquor A; dissolving dysprosium chloride into methanol to obtain liquor B; mixing the liquor A with the liquor B, adding triethylamine with concentration of 0.001mol/L to obtain mixed liquor; II, stirring the mixed liquor obtained in the step I under the room temperature to obtain a preform; and III, volatilizing the preform in the solvent to obtain the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH. The preparation method disclosed by the invention is simple, and high in yield which reaches over 45.76%. The preparation method disclosed by the invention is applied to the field of preparing the single-molecular magnets.

The invention discloses a mononuclear dysprosium complex and a preparation method and application thereof. The chemical formula of the complex is [Dy(HL)2(CH3OH)Cl3], wherein HL is 2-methyl-5,7-dibromo-8-hydroxyquinoline. The complex belongs to a monoclinic system and P21/n space groups. The preparation method of the mononuclear dysprosium complex includes the steps that DyCl3.6H2O and 2-methyl-5,7-dibromo-8-hydroxyquinoline are taken and dissolved with a mixed solvent, the pH of the obtained solution is adjusted to range from 6.5 to 7.8, the obtained mixed liquid reacts under the heating condition, and then the complex is obtained, wherein the mixed solvent is a composition of methyl alcohol and acetonitrile. The preparation method of the complex is simple, the cost is low, good repeatability is achieved, magnetic properties of the complex are shown as field-induced single-molecular magnet behaviors, and the complex can be used for preparing magnetic materials.

The invention relates to a preparation method of novel micro-nano prussian blue particles, in particular to micro-nano prussian blue particles which are synthesized by mixing two precursor solutions, i. e. potassium ferricyanide and ferric trichloride of prussian blue, and then fully stirring the mixture under the condition of a proper pH value. A synthesis device adopted by the method is simple; a common beaker is taken as a reaction vessel, and a magnetic stirring apparatus having a stirring function is used. According to the synthesis technology, the micro-nano prussian blue particles are synthesized by controlling the conversion speed of the prussian blue in a solution. The micro-nano material can be used for the application fields such as solid state batteries, electrochromic devices, molecular magnets, and the like.

The invention relates to a single molecular magnet and a preparation method of the single molecular magnet, namely to a single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2 and the preparation method of the single molecular magnet. The invention aims to solve the problems that the synthetic yield of rare earth complex single molecular magnet is relatively low, the synthetic method of the complex is complex, the batch production cannot be carried out and the like, which are faced at present. The molecular formula of the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2 is C84H56Dy2F12N4O16S4, and the crystal system is a triclinic system. The preparation method comprises the following steps: Carrying out heating reflux on a mixed solution C, then cooling to the room temperature, and filtering to obtain a solution D; dispersing a mixed solution E into the solution D in a solution dispersal mode, and standing to obtain the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2. The method is used for obtaining the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2.

The invention discloses a double-functional molecular magnet material. The structural formula of the double-functional molecular magnet material is [Co (4-Cl-PH-terpy) <2>] [Dy<3> (p-NO<2>-PHCOO)<14>], wherein the Dy represents rare-earth meal dysprosium ions, the Co represents transition metal ions, the p-NO<2>-PHCOO represents p-nitrobenzoic acid negative ions, and the 4-Cl-pH-terpy represents 4-(4-chlorophenyl)-terpyridine. The double-functional molecular magnet material integrates two functions of slow relaxation and spin transition and is synthesized by a cobalt chloride hexahydrate (CoCl<2>6H<2>O), 4'-(4-chlorophenyl)-2,2':6',2''-terpyridine, dysprosium oxide (Dy<2>O<3>), nitrobenzoic acid and other raw materials. The double-functional molecular magnet material prepared by means of a preparation method has the advantages that the good slow relaxation behavior of the dysprosium (Dy) is retained, meanwhile the high and low spin transition of cobalt (Co) is achieved, and the double-functional molecular magnet material is unprecedented at home and abroad.

The present invention relates to a PVP-coated magnetic nanoparticle, the preparation method and the application. The PVP-coated magnetic nanoparticles has the following chemical composition: KxMIIy [CrIII (CN) 6] z question mark nH2O question mark mPVP. Therein, the MII is FeII or CoII; PVP is the polyvinylpyrrolidone. The PVP-coated magnetic nanoparticle has the obvious size effectL with the increase of the content of the polymer surfactant, the size of the nanoparticle is gradually decreased; the magnetism has the dramatic changes. The present invention has the wide prospects to broaden the reorganization of people for the Prussian blue molecular magnet, to prepare and use the novel magnetic material.

The invention relates to a method for increasing the performance of a metallofullerene single-molecular magnet. The method includes: dispersing the metallofullerene single-molecular magnet into the ducts of an organic porous material, wherein the organic porous material is a metal organic framework compound material or a covalent organic frame compound material. Magnetism test results show that the metallofullerene single-molecular magnet dispersed in the organic frame compound is high in blocking temperature and magnetization intensity. By the method, the performance of the metallofullerene single-molecular magnet can be increased effectively.

The invention provides a low-temperature magnetic refrigeration material based on a molecular magnet, and a preparation method and application thereof. Molecular magnet [Mn3O (Et-Sao) _ 3 (ClO4) (OH)3] can be used for magnetic refrigeration in the temperature range of liquid helium because of its low blocking temperature and good air stability. The molecular magnet [Mn3O (EtSao) 3 (ClO4) (OH) 3]can be used for magnetic refrigeration in the temperature range of liquid helium. Secondly, by controlling the external magnetic field, the molecular magnet [Mn3O (EtSao) 3 (ClO4) (OH) 3] exhibits normal magnetocaloric effect or anti-magnetocaloric effect near the characteristic temperature to which can greatly improve the efficiency of the magnetic refrigeration cycle. The magnetization heating of conventional magnetic refrigeration materials can also be cooled by using the anti-magnetocaloric effect of molecular magnet [Mn3O (EtSao) 3 (ClO4) (OH) 3] as a heat sink.

The invention relates to an arrowhead complex material with solvent molecule-responded magnetic and ferroelectric properties and a preparation method of the arrowhead complex material. The arrowhead complex material is arrowhead (III) complex polymer simultaneously with single-molecular magnet behaviors and ferroelectric properties, has a molecular formula represented by formula (shown in the description) and is a three-dimensional porous structure containing two different coordination environment arrowhead (III) ions. The preparation method comprises the steps of dissolving Dy(NO3)3.6H2O and palmoxiric acid into a solvent, heating to react, filtering, washing to obtain solids, mixing the solids with acetone to react, heating, and drying. The arrowhead complex material has the advantages that the arrowhead complex presents the single-molecular magnet behaviors and has good ferroelectric properties, and meanwhile, the magnetic and ferroelectric properties of the arrowhead complex are can be changed along the change of solvent molecules, so that the arrowhead complex presents the solvent-responded magnetic and ferroelectric properties. The arrowhead complex material has great potential application values in solid devices such as low-temperature high-density storage equipment, nanometer devices, ferroelectric memories, integrated magnetoelectric devices and solvent photoelectromagnetic sensors.

The method includes steps: (1) dissolving Mn(CH3COO)2.4H2O,K2Cr O4 and KMnO4 in acetum fully under room temp, and continuous agitating; (2) Displacing reaction bulb to water bath jar, standing at room temp, coming up by using water bath method; (3) heating up to 318-328 K and keeping it at constant temperature; (4) cooling down to room temp naturally and standing at the state. The invention raises volume of unimolecule (Mn1-xCrx) 12-ac, and quanta storage capacity of crystal greatly, tunneling probability is 1-7.5 times larger than Mnl2-ac molecular magnet.

The invention relates to a method for preparing graphene/silver/methionine copper nano-aggregates by utilizing a liquid phase chemical reduction process and combining with coprecipitation through adjusting the pH value of a solution, and belongs to the technical field of nano-material preparation processes. The method is characterized by adjusting the pH valve of a mixed solution of graphene/silver, methionine and copper nitrate to facilitate heterogeneous nucleation of methionine and copper ions on a graphene/silver surface so as to fast prepare the nano-aggregates. The process disclosed by the invention is simple and easy, and is high in repeatability. The prepared nano-aggregates have potential applications in fields of biocompatibility electrodes, biosensors, molecular magnets and the like.

The invention discloses polyacid dysprosium single-molecular magnets and a preparation method of the polyacid dysprosium single-molecular magnets and belongs to the field of magnetic storage materials. The chemical formula of the single-molecular magnets is [NaDy(DOTA)2 7H2O] [Fe(CN)5NO]2 11H2O, wherein DOTA is 2,2',2'',2'''-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetra) quadrol. The preparation method of the polyacid dysprosium single-molecular magnets includes the following steps that dysprosium nitrate, DOTA and sodium nitroprusside are prepared into a solution according to the molar ratio 1:1:1, the solution is mixed at normal temperature for one hour and then filtered, filtrate stands still at normal temperature, crystals are separated out, and the crystals are the polyacid dysprosium single-molecular magnets. The polyacid dysprosium single-molecular magnets can be applied to new magnetic storage materials. The preparation method of the polyacid dysprosium single-molecular magnets is simple, easy to achieve and low in cost.

The invention discloses a 2-aldehyde-8-hydroxyquinoline-1,3-diamino-2-propyl alcohol Schiff base four-core dysprosium cluster compound and a synthesis method thereof. The cluster compound belongs to amonoclinic system, a P21/n space group, and the chemical formula is [Dy4(C23H17N4O3)2(mu3-OH)2(NO3)4(H2O)2]. The synthesis method of the cluster compound comprises the following steps: dissolving 2-aldehyde-8-hydroxyquinoline, 1,3-diamino-2-propyl alcohol and Dy(NO3)3*6H2O into a mixed solvent, adjusting the pH of the obtained solution to be 9.4 to 10.0, performing reaction on the obtained mixedliquid under the heating condition, cooling a reactant and separating out crystals to obtain the cluster compound, wherein the mixed solvent is a composition of ethanol and acetonitrile. The cluster compound has field induced single-molecular magnet behavior and can be used for preparing a magnetic material; furthermore, the synthesis method is simple and easy to operate.

The invention discloses a structure-fine controllable Mn<2+> paramagnetic compound and its preparation method and use. A complex precursor ligand is modified and is introduced to the same multi-anion framework so that the structure-fine controllable Mn<2+> paramagnetic compound is obtained. The preparation method comprises synthesizing an Mn-Salen type dual-core compound, preparing an Mn-Salen solution, preparing a multi-anion aqueous solution, dropwisely adding the Mn-Salen solution into the multi-anion aqueous solution, and carrying out constant-speed stirring at a temperature of 40 to 50 DEG C for 4 to 10h to obtain the structure-fine controllable Mn<2+> paramagnetic compound. The structure-fine controllable Mn<2+> paramagnetic compound can be used for molecular magnets. The preparation method realizes fine control of a magnetic complex first and provides a novel approach for magnetic compound controllable synthesis. The preparation method has mild conditions and a low cost, further enriches types of organic and inorganic hybrid materials and provides a novel method for research on properties of a single magnetic molecule.

The invention discloses a ten-core dysprosium cluster compound single-molecular magnet and a preparation method thereof. The ten-core dysprosium cluster compound single-molecular magnet has the chemical formula as [Dy10(ovpho)4(NO3)4(CH3O)3(mu4-O)2(mu3-OH)2(mu2-OH)(H2O)4].8H2O. The ten-core dysprosium cluster compound single-molecular magnet is crystallized in an orthorhombic system Pbcn space group and is structurally formed by two edge-shaped {Dy4} tetrahedron elements and two {Dy2} double-core units located on two sides of the tetrahedron elements. The preparation method comprises the stepsof adopting an H4ovpho ligand and Dy(NO3)3.6H2O with the molar ratio being 1:3 as raw materials, adopting methanol and acetonitrile as solvents, adopting triethylamine as an alkaline matter, stirring, carrying out solvothermal reaction, separating, and washing solids. The ten-core dysprosium cluster compound single-molecular magnet provided by the invention is simple in process, low in cost, easyto control chemical components, good in repeatability and high in yield. Meanwhile, the cluster compound size reaches to the nano scale and is the rare high-core nano single-molecular magnet.

The invention discloses a rare earth based molecular magnet constructed by taking alkylol amine Schiff base generated in situ as a ligand and a preparation method of the rare earth based molecular magnet. The chemical formula of the rare earth based molecular magnet is [Dy10(L)4(HL)2([mu]5-NO3)2(CH3COO)12].8H2O, wherein the L represents that three hydroxyl hydrogen atoms are removed from 3-[(2-hydroxyl-3-oxethyl)-benzylideneamino]-1, 2-propylene glycol; the HL represents that two hydroxyl hydrogen atoms are removed from 3-[(2-hydroxyl-3-oxethyl)-benzylideneamino]-1, 2-propylene glycol. The preparation method of the rare earth based molecular magnet comprises the following steps: taking Dy(NO3)3.6H2O, Dy(CH3COO)3.6H2O, 3-oxethyl-2-hydroxy benzaldehyde and 3-amino-1, 2-propylene glycol, dissolving the materials by using a mixed solvent, adjusting the pH value, carrying out liquid nitrogen refrigeration, vacuumizing, fusion-sealing, and carrying out the heating reaction, so as to obtain the rare earth based molecular magnet. The molecular magnet provided by the invention is integrally paramagnetic.

The invention discloses a mixed metal ion single-molecular magnet and a synthesis method thereof, belonging to the field of magnetic storage materials. The chemical formula of the single-molecular magnet is D<y>(DMF)4(H2O)3Fe(CN)6.H2O, wherein DMF is N,N-dimethyl formamide. The preparation method comprises the following steps: evenly mixing dysprosium nitrate and a potassium ferricyanide solution, adding a DMF (dimethyl formamide) solution of quinoline-2-formic acid, stirring for one hour at normal temperature, filtering, standing a filtrate at the normal temperature, and separating out crystals, namely the mixed metal ion single-molecular magnet. The mixed metal ion single-molecular magnet can be applied to a novel magnetic storage material; the method is simple, easy to realize and low in cost.

The invention discloses a Co(III)-Co(II) binuclear cobalt single-molecular magnet, a preparation method and application thereof, the chemical formula of the single-molecular magnet is [CoIIICoII(L)(DMAP)3(CH3COO)], wherein H4L is N, N'-bis(5-methylpyrazole-3-formyl)-1, 3-propane diamine, and the structure is as shown in the specification, DMAP is 4-dimethylaminopyridine, and the structure is as shown in the specification. Compared with the prior art, the Co(III)-Co(II) binuclear cobalt single-molecular magnet has the following advantages that: (1) the Co(III)-Co(II) binuclear cobalt single-molecular magnet can show typical slow relaxation behavior under an external magnetic field of 0.1T, has the characteristics of a single-molecular magnet, and can be used as a molecule-based magnetic material in novel high-density information storage equipment (such as an optical disk and a hard disk); and (2) the method is safe and simple in process, high in controllability and good in reproducibility.

The invention discloses a cobalt-based single-molecular magnet synthesizing method. Cobalt salt and 2-hydroxybenzimidazole ligand are adopted with participation of azides ions, and a cobalt-based single-molecular magnet is prepared under the solvothermal system or a microwave reaction condition. It is indicated by experiments that the process is safe and simple, the cost of raw materials is low, the defect that the reproducibility of a common solution method is poor is overcome, the obtained single-molecular magnet of the [Co12(L)15(N3)7](NO3)2.2(CH3OH).2(H2O) (L is the 2-hydroxybenzimidazole ligand ) is red hexagonal-prism-shaped crystal, the purity is high, the crystal size is large and can be controlled within 2*1*1.5 mm, and the yield is high and reaches over 50%.