The synthesis, crystal structure and photophysical properties of mononuclear platinum(II) 6-phenyl-[2,2′]bipyridinyl acetylide complexes

The synthesis, structural, electrochemical and photophysical properties of a series of 4,6-diphenyl-2,2′-bipyridine platinum(II) complexes bearing σ-alkynyl ancillary ligands were studied. Absorption bands were observed in UV-Vis absorption spectra (maximum peaks range from 431 to 455 nm) and phosphorescence emission maxima varied from 554 nm to 577 nm. Both the UV absorption and photoluminesence emission maxima of the complexes were red-shifted in accordance with not only the electron-donating ability of the para-substituent on the phenylacetylide ligand, but also the extension of the π-conjugated length of the oligo phenylacetylide ligand. The photoluminescent and electrochemical properties as well as crystal structure were investigated with the aim of providing the basis for elucidating structure-physical property relationships in the context of light-emitting materials.