New bimetallic complexes of late transition metals involving pyrazole-bridged bis N-heterocyclic carbene ligands

摘要

Bimetallic Ni,Rh,and Ir complexes of pyrazolate biscarbene containing bulky substituents have been synthesized and characterized by X-ray crystallography;the Ni complex dimerizes to a highly congested L2Ni2 structure,whereas the corresponding Rh and Ir complexes form bimetallic LM2 structures.