Synthesis and Crystal Structures of Dinuclear Zinc Complexes with the 3,5-Bis(pyridine-2-yl)pyrazolato Ligand
Résumé
Zincation of 3,5-bis(pyridine-2-yl)pyrazole with Zn[E(SiMe3)2]2 in tetrahydrofuran yields dimeric 3,5-bis(pyridine-2-yl)pyrazolato zinc bis(trimethylsilyl)amide (E = N, 1) and bis(trimethylsilyl)methanide (E = CH, 2). These complexes crystallize in the space groups P21/n and P ī, respectively. The zinc atoms are in distorted tetrahedral environments. In the solid state the 3,5-bis(pyridine-2-yl)pyrazolato anions act as bridging tridentate bases with one pyridyl group not participating in the coordination behaviour. In solution exchange processes fast on the NMR time scale lead to a single set of resonances for the pyridyl substituents.
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