New tridentate cyclometalated platinum(II) and palladium(II) complexes of N,2-diphenyl-8-quinolinamine : syntheses, crystal structures, and photophysical properties

Abstract A new tridentate cyclometalated platinum(II) complex derived from N ,2-diphenyl-8-quinolinamine, which consists of two crystallographic independent molecules with two intermolecular N–H–Cl–Pt hydrogen bonds forming a dimer, exhibited a low-energy luminescence at ca. 740 nm in a 1 × 10 −3  M dichloromethane solution and a strong emission centered at 670 nm in a solid state, but the analogous palladium(II) complex was nonemissive at room temperature.