Abstract
Comparative study of cyclopalladated ethylenediamine complexes of 2,3-diphenylquinoxaline (Hdphqx) [Pd(dphqx)En]ClO4 and 2,2′,3,3′-tetraphenylbiquinoline (H2tphbq) [(PdEn)2(μ-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 com-pared to free ligands.
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