Issue 2, 2022

Thermal and photoinduced spin-crossover of mononuclear FeII complexes based on bppCHO ligand

Abstract

Two new iron(II) complexes [Fe(bppCHO)2](ClO4)2 (1·ClO4) and [Fe(bppCHO)2](BF4)2·H2O (1·BF4) were synthesized by using 2,6-di(1H-pyrazol-1-yl)isonicotinaldehyde (bppCHO) as the ligand. The structures and spin states of the complexes were characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. Complex 1·ClO4 exhibits light-induced excited spin state trapping (LIESST) up to 53 K and two-step spin-crossover (SCO) over room temperature, in which the first step shows a thermal hysteresis of 26 K, whereas 1·BF4 exhibits a gradual SCO behavior. A magnetostructural study reveals that the difference in the SCO property is related to the supramolecular interactions and crystal packing effect.

Graphical abstract: Thermal and photoinduced spin-crossover of mononuclear FeII complexes based on bppCHO ligand

Supplementary files

Article information

Article type
Paper
Submitted
29 Oct 2021
Accepted
01 Dec 2021
First published
01 Dec 2021

Dalton Trans., 2022,51, 602-607

Thermal and photoinduced spin-crossover of mononuclear FeII complexes based on bppCHO ligand

Q. Yang, Y. Meng, T. Liu and J. Tang, Dalton Trans., 2022, 51, 602 DOI: 10.1039/D1DT03664E

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