Confined Crystallization of Spin-Crossover Nanoparticles in Block-Copolymer Micelles.
Angew Chem Int Ed Engl
; 59(14): 5765-5770, 2020 Mar 27.
Article
em En
| MEDLINE
| ID: mdl-31891660
ABSTRACT
Nanoparticles of the spin-crossover coordination polymer [FeL(bipy)]n were synthesized by confined crystallization within the core of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer micelles. The 4VP units in the micellar core act as coordination sites for the Fe complex. In the bulk material, the spin-crossover nanoparticles in the core are well isolated from each other allowing thermal treatment without disintegration of their structure. During annealing above the glass transition temperature of the PS block, the transition temperature is shifted gradually to higher temperatures from the as-synthesized product (T1/2 ↓=163â
K and T1/2 ↑=170â
K) to the annealed product (T1/2 ↓=203â
K and T1/2 ↑=217â
K) along with an increase in hysteresis width from 6â
K to 14â
K. Thus, the spin-crossover properties can be shifted towards the properties of the related bulk material. The stability of the nanocomposite allows further processing, such as electrospinning from solution.
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MEDLINE
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article