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Spin Crossover and Thermochromism in Iron-4-methoxypyridine
Ist Teil von
International journal of molecular sciences, 2023-06, Vol.24 (12)
Ort / Verlag
MDPI AG
Erscheinungsjahr
2023
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
New iron(II) complexes with 2,6-bis(1H-imidazol-2-yl)-4-methoxypyridine (L) of the composition [FeL[sub.2]]A[sub.n]∙mH[sub.2]O (A = SO[sub.4] [sup.2−], n = 1, m = 2 (I); A = ReO[sub.4] [sup.−], n = 2, m = 1 (II); A = Br[sup.−], n = 2, m = 2 (III)) have been synthesized and investigated. To determine the coordination ability of the ligand, a single crystal of a copper(II) complex of the composition [CuLCl[sub.2]] (IV) was obtained and studied by X-ray technique. Compounds I–III were studied using methods of X-ray phase analysis, electron (diffuse reflection spectra), infrared and Mössbauer spectroscopy, static magnetic susceptibility. The study of the µ[sub.eff](T) dependence showed that the [sup.1]A[sub.1] ↔ [sup.5]T[sub.2] spin crossover manifests itself in the compounds. The spin crossover is accompanied by thermochromism: there is a distinct color change orange ↔ red-violet.