Spectroscopic and Electrochemical Properties of Cyclopalladated Complexes of 2,3-Diphenylquinoxaline and 2,2',3,3'-Tetraphenyl-6,6'-Biquinoline

摘要

Comparative study of cyclopalladated ethylenediamine complexes of 2,3-diphenylquinoxaline(Hdphqx)[Pd(dphqx)En]ClO4 and 2,2',3,3'-tetraphenylbiquinoline(H2tphbq)[(PdEn)2(mu-tphbq)](ClO4)2,and the free heterocyclic ligands was performed by means of ~1H NMR spectroscopy,electronic absorption and emission spectroscopy,and cyclic voltammetry.It was shown that cyclopalladation gives rise to a long-wave absorption band in the visible spectrum,a batochromic shift of the vibrationally structured phosphorescence band,and an anodic shift of the ligand-centered reduction potential of the complexes corn-pared to free ligands.