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Iron(II) Spin Crossover Complexes with 4,4′-Dipyridylethyne—Crystal Structures and Spin Crossover with Hysteresis
Open AccessFeature PaperArticle

First Cobalt(II) Spin Crossover Compound with N4S2-Donorset

Department of Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, ‎Germany
Author to whom correspondence should be addressed.
Molecules 2020, 25(4), 855; (registering DOI)
Received: 30 January 2020 / Revised: 10 February 2020 / Accepted: 11 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Functional Magnetic Molecular Materials)
Herein we report the synthesis and characterization of a novel bis-tridentate 1,3,4-thiadiazole ligand (L = 2,5-bis[(2-pyridylmethyl)thio]methyl-1,3,4-thiadiazole). Two new mononuclear complexes of the type [MII(L)2](ClO4)2 (with M = FeII (C1) and CoII (C2)) have been synthesized, containing the new ligand (L). In both complexes the metal centers are coordinated by an N4S2‑donorset and each of the two ligands is donating to the metal ion with just one of the tridentate pockets. The iron(II) complex (C1) is in the low spin [LS] state below room temperature and shows an increase in the magnetic moment only above 300 K. In contrast, the cobalt(II) complex (C2) shows a gradual spin crossover (SCO) with T1/2 = 175 K. To our knowledge, this is the first cobalt(II) SCO complex with an N4S2-coordination.
Keywords: spin crossover; iron(II); cobalt(II); N4S2-donorset; 1,3,4-thiadiazole; magnetism spin crossover; iron(II); cobalt(II); N4S2-donorset; 1,3,4-thiadiazole; magnetism
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MDPI and ACS Style

Fürmeyer, F.; Münzberg, D.; Carrella, L.M.; Rentschler, E. First Cobalt(II) Spin Crossover Compound with N4S2-Donorset. Molecules 2020, 25, 855.

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