Synthesis and photophysical properties of cyclometalated 4′-phenyl-2,2′:6′,2″-terpyridyl Pt(II) chloride complexes with different aryl substituents

Energy transfer in metal-exchange binuclear complexes covalently linked by asymmetric ligands

“…However, the heterometallic complexes C5, C6, C9, and C10 exhibited four absorption bands in the range of 200-800 nm. The ligand-centered π → π* transitions of all complexes were observed in the range of 285 to 289 nm, [36][37][38][39] even though the transition involving the bipyridine ligand was expected to occur at a slightly higher energy than that involving the bridging ligand L. 40,41 All complexes exhibited broad MLCT absorption bands with moderate intensity at 234-255 and 450-460 nm, 42 due to the overlapping of the absorption spectra of the bridging ligand L and bipyridine. 43,44 For monometallic complexes C1 and C2, we calculated their MLCT at 456 nm ( f = 0.443 for C1 and f = 0.040 for C2), in good agreement with the experimental value at 458 nm.…”