Herein we report the synthesis and characterization of a novel bis-tridentate 1,3,4-thiadiazole ligand ( = 2,5-bis[(2-pyridylmethyl)thio]methyl-1,3,4-thiadiazole). Two new mononuclear complexes of the type [M()](ClO) (with M = Fe () and Co ()) have been synthesized, containing the new ligand (). In both complexes the metal centers are coordinated by an NS-donorset and each of the two ligands is donating to the metal ion with just one of the tridentate pockets. The iron(II) complex () 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 () shows a gradual spin crossover (SCO) with = 175 K. To our knowledge, this is the first cobalt(II) SCO complex with an NS-coordination.
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| http://dx.doi.org/10.3390/molecules25040855 | DOI Listing |
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