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Spin crossover hollow nanosphere and its preparation method and use

A technology of spin crossing and nanospheres, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing sensitivity and achieve the effect of flexible preparation methods

Active Publication Date: 2017-01-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A serious disadvantage of these techniques is that the presence of large amounts of surfactants or functional polymers can greatly dilute the density of spin-crossing centers in the material, thereby reducing the sensitivity for the detection of spin-crossing behavior
However, in the field of spin crossing research, the research on assembling spin crossing materials into nanomaterials through liposome self-assembly has not been reported yet.

Method used

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  • Spin crossover hollow nanosphere and its preparation method and use
  • Spin crossover hollow nanosphere and its preparation method and use
  • Spin crossover hollow nanosphere and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 lipophilic alkylation 2,2'-bipyridyl ligand synthesis

[0050] In this example, N 4 , N 4 '-Dihexyl-(2,2'-bipyridine)-4,4'-diamide (N 4 , N 4 '-dihexyl-(2,2'-bipyridine)-4,4'-dicarboxamide, dhbdc) as an example: 100mg 4,4'-dicarboxylic acid-2,2'-bipyridine was dissolved in a 250mL round bottom flask in 60 mL of dry SOCl 2 In the solution, reflux at 80°C for 2h. Rotate to dryness at 60°C to remove excess SOCl 2 solution to obtain 114.34 g of 4,4-diacyl chloride-2,2-bipyridine. The resulting 4,4-diacid chloride-2,2-bipyridine was immediately dissolved in 80 mL of dichloromethane solution, and 83 mg of hexylamine and 100 mg of triethylamine were added to the solution, and stirred at room temperature for 2 hours to obtain lipophilic dhbdc ligand.

Embodiment 2

[0051] Embodiment 2 hydrophilic Fe(H 2 Bpz 2 ) component synthesis

[0052] 0.2mmol of Fe(ClO 4 ) 2 ·6H 2 O and 0.4 mmol of ligand KH 2 Bpz 2Dissolve in 20mL methanol solution in nitrogen atmosphere, stir for 20 minutes, the white precipitate KClO 4 Remove by filtration. The obtained filtrate is Fe(H 2 Bpz 2 ) in methanol solution.

Embodiment 3

[0053] Example 3 Synthesis of amphiphilic spin cross complexes

[0054] In this example [Fe(H 2 Bpz 2 ) 2 (dhbdc)] as an example: the above obtained Fe(H 2 Bpz 2 ) filtrate was slowly added to 20 mL of a chloroform solution in which 0.2 mmol of the ligand dhbdc was dissolved at a temperature of 60° C. The solution turned brown immediately, accompanied by the precipitation of a brown solid. The resulting suspension solution was stirred at 60° C. for 1 hour, filtered to obtain a brown solid, and washed with 10 mL of methanol and 10 mL of chloroform solution to obtain pure [Fe(H 2 Bpz 2 ) 2 (dhbdc)] product.

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Abstract

The invention discloses a spin crossover hollow nanosphere and its preparation method and use. The spin crossover hollow nanosphere is prepared from an amphiphilic spin crossover complex through self-assembling in a phosphate buffer solution (PBS) with pH of 7.2-7.4. The amphiphilic spin crossover complex has a chemical structural formula shown in the description. The self-assembled structure is a liposome-type double layer spherical structure. The solid nanosphere is obtained by freeze drying. The spin crossover hollow nanosphere does not contain any surfactant. The hollow nanosphere structure improves a spin crossover transformation temperature and realizes spin crossover in a normal temperature range. The spin crossover hollow nanosphere is prepared through simple processes, has stable performances and has a large application prospect in the fields of information storage, molecule switch and molecule display.

Description

technical field [0001] The invention belongs to the field of spin-crossed nanomaterials, and more particularly relates to a spin-crossed hollow nanosphere and its preparation method and application. Background technique [0002] Among molecular-based magnetic materials, molecular bistability is an attractive field. Spin crossing is one of the most important bistable materials. Under specific external stimulus conditions (such as temperature, pressure, light, strong magnetic field, etc.), the mutual conversion between high-spin and low-spin states will be accompanied by a series of Magnetic, optical, thermal and other performance changes. This excellent property makes the spin crossover materials have attractive application prospects in new information storage devices, molecular switches, display devices, detector devices and other fields at the molecular level (Chem Soc Rev 2011, 40, 3313-3335). [0003] The ultimate goal of the research on spin-crossed materials is to mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F15/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07F15/025
Inventor 罗洋辉孙伯旺王靖雯吴鸿帅张雅雯
Owner SOUTHEAST UNIV