Synthesis and Crystal Structures of Dinuclear Zinc Complexes with the 3,5‐Bis(pyridine‐2‐yl)pyrazolato Ligand

Abstract

AbstractZincation 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 $\rm P2_1/n$, 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 behavior. In solution, exchange processes, which are fast on the NMR time scale, lead to a single set of resonances for the pyridyl substituents.