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Spin crossover-upconversion nano composite material as well as preparation method and application thereof

A technology of nanocomposite materials and spin crossover, applied in the field of spin crossover-upconversion nanocomposite materials and their preparation, which can solve problems such as attenuation

Inactive Publication Date: 2018-09-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the LIESST effect has obvious disadvantages: it is usually only realized below 50K, and the excited HS state decays rapidly to the LS state
However, the research on the assembly of up-conversion nanoluminescent materials and spin-crossing materials into multifunctional and synergistic composite materials and realizing photo-induced spin-crossing at the single-molecule level has not been reported.

Method used

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  • Spin crossover-upconversion nano composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] A spin-crossing-upconversion nanocomposite material, the composite material is composed of a spin-crossing complex and an up-conversion nano-luminescent material through a coordination bond, and the structural formula is UCNPs@SCO, wherein SCO is a spin-crossing complex , the spin cross complexes are mononuclear ferrous compounds containing active functional groups, and UCNPs are up-conversion nano-luminescent materials. The mononuclear ferrous compound containing carboxyl functional group is [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)].

[0029] This example spin cross complex selects the mononuclear ferrous compound containing carboxyl functional group [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)], up-conversion nano-luminescent materials select up-conversion nanoparticles β-NaYF 4 :ErYb is used as material to prepare spin crossover-upconversion nanocomposite.

[0030] The preparation method of the spin cross-up conversion nanocomposite is as follows:

[0031] Step 1. Synthetic Fe(H 2 Bp...

Embodiment 2

[0036] This example spin cross complex selects the mononuclear ferrous compound containing carboxyl functional group [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)], up-conversion nano-luminescent materials select up-conversion nanoparticles β-NaYF 4 : TmYb is used as material to prepare spin cross-up conversion nanocomposite.

[0037] The preparation method of the spin cross-up conversion nanocomposite is as follows:

[0038] Step 1. Synthetic Fe(H 2 Bpz 2 ) 2 Alcoholic solution, 0.3 mmol of Fe(ClO 4 ) 2 ·6H 2 O and 0.5 mmol of ligand KH 2 Bpz 2 Dissolve in 50 mL of methanol solution in a nitrogen atmosphere, stir for 25 min, and remove the resulting white precipitate KClO 4 Remove by filtration, the filtrate obtained is Fe(H 2 Bpz 2 ) 2 methanol solution.

[0039] Step 2. Synthesis contains the mononuclear ferrous compound [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)], 0.3 mmol 4,4'-dicarboxy-2,2'-bipyridine ligand and 1 mmol hexadecylamine were mixed and fully dissolved in 45 mL methanol...

Embodiment 3

[0043] This example spin cross complex selects the mononuclear ferrous compound containing carboxyl functional group [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)], up-conversion nano-luminescent materials select up-conversion nanoparticles β-NaYF 4 : HoYb is used as material to prepare spin crossover-upconversion nanocomposite.

[0044] The preparation method of the spin cross-up conversion nanocomposite is as follows:

[0045] Step 1. Synthetic Fe(H 2 Bpz 2 ) 2 Alcoholic solution, 0.25 mmol of Fe(ClO 4 ) 2 ·6H 2 O and 0.5 mmol of ligand KH 2 Bpz 2 Dissolve in 12.5 mL of methanol solution in a nitrogen atmosphere, stir for 20 min, and remove the resulting white precipitate KClO 4 Remove by filtration, the filtrate obtained is Fe(H 2 Bpz 2 ) 2 methanol solution.

[0046] Step 2. Synthesis contains the mononuclear ferrous compound [Fe(H 2 Bpz 2 ) 2 (bipy-COOH)], 0.2 mmol 4,4'-dicarboxy-2,2'-bipyridine ligand and 0.4 mmol hexadecylamine were mixed and fully dissolved in 15 mL ...

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Abstract

The invention discloses a spin crossover-upconversion nano composite material as well as a preparation method and application thereof, and belongs to the field of spin crossover complex materials. Thespin crossover-upconversion nano composite material is formed by combining a spin crossover complex and an upconversion nano luminous material through a coordination bond, and a structural formula isUCNPs@SCO, wherein SCO is the spin crossover complex; the spin crossover complex is an active functional group-containing single-core ferrous compound; UCNPs is the upconversion nano luminous material for exploring regulation and control of a spin crossover behavior by near infrared excitation. The method is easy to operate and mild in condition and can realize low-energy photoinduced spin crossover behavior at a solid-state unimolecule level; the material is applied to molecular electronic appliances related to information storage, molecular switching and molecular displaying.

Description

technical field [0001] The invention belongs to the field of spin crossing complex materials, and more specifically relates to a spin crossing-up conversion nanocomposite material and its preparation method and application. Background technique [0002] The spin crossing phenomenon is an attractive research area in molecular-based magnetic materials. The heat, pressure or light-induced spin crossing phenomenon of spin crossing complexes may be accompanied by a series of other synergistic effects, such as changes in physical and chemical properties such as magnetic behavior, dielectric constant, compound color, and the presence of large thermal hysteresis effect etc. In contrast to other types of bistable materials, the electronic transitions within the corresponding transition metal central ions of spin-crossed materials are distinct from electron transfer between ions or bond transfer of bonded isomers without fatigue effects of any kind , and the spin crossover phenome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F15/02C07F19/00B82Y30/00B82Y40/00H01L51/54H01L51/50C09K11/06C09K11/85
CPCC09K11/06C09K11/7773B82Y30/00B82Y40/00C07F15/025C07F19/005C09K2211/182C09K2211/187H10K85/361H10K50/00
Inventor 罗洋辉王靖雯陈晨何晓彤洪丹丽孙伯旺
Owner SOUTHEAST UNIV
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