Synthesis and luminescence properties of platinum(II) complexes of 4'-chloro-2, 2': 6', 2'-terpyridine and 4, 4', 4'-trichloro-2, 2' : 6', 2'-terpyridine

摘要

The complex [Pt(Cl_3terpy)Cl]PF_6 had been prepared from cis-[Pt(dimethylsulfoxide)_2Cl_2] and 4, 4', 4"-trichloro-2, 2':6', 2"-ter-pyridine(Cl_3terpy). The complex [Pt(Clterpy)Cl]Cl has been prepared from cis-[Pt(1, 5-cyclooctadiene)Cl_2] and 4'-chloro-2, 2':6', 2"-terpyridine (Clterpy). Complexes have been charaterized by ~-1H NMR, IR nad UV-Vis spectroscopies and elemental analysis. The lowest energy excited state for these complexes is metal-to-ligand charge transfer (MLCT) in charcter. UV-Vis and low-temperature luminescence spectroscopy indicate that the MLCT stae energy is lowered by chlorination of the terpy ligand. Chlorination also has substantial effects on the luminescent prperties in fluid solutin at 298 K. Unlike the related 'parent' complex [Pt(terpy)Cl]~+, the chlorinated terpy complexes in fluid solution at 298 K. The 1.9 #mu#s ~3MLCT emission lifetime for [Pt(Cl_3terpy)Cl] PF_6 is unusually long for a platinum(II) complex in fluid solution.