Room temperature light induced spin state switching in a Fe<sup>II</sup> coordination polymer featuring a photo responsive anion
(2022) Journal of Materials Chemistry C — Vol. 10, n° 38, p. 14128-14134 (2022)
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- 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.
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Kumar, V., Rotaru, A., & Garcia, Y. (2022). Room temperature light induced spin state switching in a Fe<sup>II</sup> coordination polymer featuring a photo responsive anion. Journal of Materials Chemistry C, 10(38), 14128-14134. https://doi.org/10.1039/d2tc02415b (Original work published 2022)