Mononuclear Cobalt(II or III) Hydrazonate Complexes:Synthesis,Characterization,Spectroscopic,Electrochemical and MagneticProperties

摘要

Picolinoylhydrazones with additional donor substituents are often used in moderncoordination chemistry because of their versatility of coordination modes.In addition,theirtransition-metal complexes are expected to show an intriguingproton-coupled electron transfer reaction using the uncoordinatingN-H group.A variety of transition-metal complexes bearing theseligands have been reported,but a systematic study on theircoordination modes and the resulting properties of metalcomplexes are limited so far.Herein,we utilize the 2-pyridyl and1H-imidazol-4-yl substituted picolinolylhydrazones (Scheme 1:HLpy and H2Lim) to prepare their cobalt(II or III) complexes.