First Cobalt(II) Spin Crossover Compound with N4S2-Donorset
Department of Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
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Molecules 2020, 25(4), 855; https://doi.org/10.3390/molecules25040855
Received: 30 January 2020
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Revised: 10 February 2020
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Accepted: 11 February 2020
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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.
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Keywords:
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. https://doi.org/10.3390/molecules25040855
AMA Style
Fürmeyer F, Münzberg D, Carrella LM, Rentschler E. First Cobalt(II) Spin Crossover Compound with N4S2-Donorset. Molecules. 2020; 25(4):855. https://doi.org/10.3390/molecules25040855
Chicago/Turabian StyleFürmeyer, Fabian, Danny Münzberg, Luca M. Carrella, and Eva Rentschler. 2020. "First Cobalt(II) Spin Crossover Compound with N4S2-Donorset" Molecules 25, no. 4: 855. https://doi.org/10.3390/molecules25040855
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