ON/OFF Photoswitching and Thermoinduced Spin Crossover with Cooperative Luminescence in a 2D Iron(II) Coordination Polymer - Archive ouverte HAL Access content directly
Journal Articles Inorganic Chemistry Year : 2020

ON/OFF Photoswitching and Thermoinduced Spin Crossover with Cooperative Luminescence in a 2D Iron(II) Coordination Polymer

Abstract

A 2D coordination polymer, {[Fe(L) 2 (NCSe) 2 ]•6MeOH•14H 2 O} n (1; L = 2,5-dipyridylethynylene-3,4-ethylenedioxythiophene), has been synthesized based on a redox active luminescence ligand. 1 possesses a 2D [4 × 4] square-grid network where the iron(II) center is in a FeN 6 octahedral coordination environment. 1 displays reversible thermoinduced high-spin (HS; S = 2) to diamagnetic low-spin (LS; S = 0) ON/OFF spin-state switching with a T 1/2 value of 150 K. Interestingly, optical reflectivity and photomagnetic studies at 10 K under light irradiation revealed an efficient conversion to a photoinduced metastable HS excited state from a LS ground state. Remarkably, the photoexcited HS state can be reversibly switched ON and OFF by using 625 and 850 nm light-emitting-diode lights. Intriguingly, the thermal dependence of the luminescence intensity of the maximum emission at 524 nm for 1 shows a minimum at around the spin-crossover (SCO) temperature, indicating a cooperative nature between the SCO and luminescence properties. Theoretical calculations confirmed the above findings.
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Dates and versions

hal-03086345 , version 1 (22-12-2020)

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Subrata Ghosh, Sujit Kamilya, Titas Pramanik, Mathieu Rouzières, Radovan Herchel, et al.. ON/OFF Photoswitching and Thermoinduced Spin Crossover with Cooperative Luminescence in a 2D Iron(II) Coordination Polymer. Inorganic Chemistry, 2020, 59, pp.13009 - 13013. ⟨10.1021/acs.inorgchem.0c02136⟩. ⟨hal-03086345⟩

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