Issue 38, 2022

Room temperature light induced spin state switching in a FeII coordination polymer featuring a photo responsive anion

Abstract

The FeII coordination polymer, [Fe(NH2trz)3](psca)2·2H2O (CP-1), incorporating a photo-responsive non-coordinated anion, p-sulfocinnamic acid (psca), was synthesized in the pursuit of solid state light-induced spin crossover at room temperature. 57Fe Mössbauer spectroscopy shows that CP-1 exists in a mixed spin state with a major low-spin fraction at room temperature. UV irradiation on CP-1 caused a colour change from pink to brown and yielded the photoproduct, [Fe(NH2trz)3](dsta)·2.5H2O (CP-2) at room temperature. Diffuse reflectance spectroscopy suggested successful photodimerization of psca after irradiation and also indicated a change in spin states as an irradiation effect. This is supported by SQUID magnetometry and 57Fe Mössbauer spectroscopy measurements of CP-2, which confirmed an increase in the high-spin fraction from 29% to 53% at room temperature, as an effect of UV irradiation. Such Anion Driven Light Induced Spin State Change (AD-LISC), which is observed for the first time, leads to a modification of the spin crossover properties from CP-1 to CP-2. A spin crossover material embedding a non photo-switching anion, [Fe(NH2trz)3](tos)2·H2O was studied too, to support the photo-irradiation effect, on CP-1.

Graphical abstract: Room temperature light induced spin state switching in a FeII coordination polymer featuring a photo responsive anion

Supplementary files

Article information

Article type
Paper
Submitted
09 Jun 2022
Accepted
11 Aug 2022
First published
19 Aug 2022

J. Mater. Chem. C, 2022,10, 14128-14134

Room temperature light induced spin state switching in a FeII coordination polymer featuring a photo responsive anion

V. Kumar, A. Rotaru and Y. Garcia, J. Mater. Chem. C, 2022, 10, 14128 DOI: 10.1039/D2TC02415B

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