Department of Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, Germany.
Molecules. 2020 Feb 14;25(4):855. doi: 10.3390/molecules25040855.
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() (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.
在此，我们报告了一种新型双齿 1,3,4-噻二唑配体（ = 2,5-双[(2-吡啶甲基)硫基]甲基-1,3,4-噻二唑）的合成与表征。合成了两种新型单核配合物M()（其中 M = Fe() 和 Co()），含有新型配体（）。在这两个配合物中，金属中心均由一个 NS 供体配位，两个配体中的每一个都只通过一个三齿口袋向金属离子供体。铁(II)配合物()在室温以下处于低自旋[LS]状态，仅在 300 K 以上时磁矩才会增加。相比之下，钴(II)配合物()表现出逐渐的自旋交叉(SCO)，T1/2 = 175 K。据我们所知，这是首例具有 NS 配位的钴(II)SCO 配合物。
