Issue 25, 2019

Spin crossover and photomagnetic behaviors in one-dimensional looped coordination polymers

Abstract

Three one-dimensional looped coordination polymers with the formula of [Fe(dpds)2{C(CN)3}2]·dpds (1, dpds = 4,4′-dipyridyl disulfide), [Fe(dpds)2(NCBH3)2] (2) and [Fe(dpds)2(NCSe)2]·3.5H2O (3) have been synthesized and characterized by single-crystal X-ray crystallography, Mössbauer spectroscopy and magnetic measurements. The spin-crossover (SCO) behaviors of these compounds depend significantly on axial ligands: compound 1 exhibited thermal-induced complete one-step SCO behavior with a T1/2 of 170 K, and 2 showed incomplete SCO behavior with T1/2 being 130 K, whereas 3 was paramagnetic. Meanwhile, both compounds 1 and 2 displayed light-induced excited spin-state trapping (LIESST) effects, featuring TLIESST values of 45 K and 61 K for 1 and 2, respectively, which were independent of exciting laser wavelengths. These results suggest that anions such as C(CN)3 and NCBH3 with much stronger ligand fields are needed in order to realize spin-state switching, if a ligand such as dpds is adopted to synthesize SCO compounds.

Graphical abstract: Spin crossover and photomagnetic behaviors in one-dimensional looped coordination polymers

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2019
Accepted
23 May 2019
First published
24 May 2019

Dalton Trans., 2019,48, 9243-9249

Spin crossover and photomagnetic behaviors in one-dimensional looped coordination polymers

X. Sun, T. Liu, Z. Yao and J. Tao, Dalton Trans., 2019, 48, 9243 DOI: 10.1039/C9DT01520E

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