176981-55-8Relevant articles and documents
Photoluminescent cyclometallated diplatinum(II,II) complexes: photophysical properties and crystal structures of ClO4 and 2 (HL=6-phenyl-2,2'-bipyridine, dppm=Ph2PCH2PPh2)
Cheung, Tsz-Chun,Cheung, Kung-Kai,Peng, Shie-Ming,Che, Chi-Ming
, p. 1645 - 1652 (2007/10/03)
The complexes 1, ClO4 2 and 2 3 (HL=6-phenyl-2,2'-bipyridine, dppm=Ph2PCH2PPh2) have been prepared and their spectroscopic and emission properties studied.Complex 3 shows a broad and intense absorption at 420-510 nm which is tentatively assigned to a metal-metal to ligand charge-transfer transition 1m.m.l.c.t. 1?*->?(?*)>, where d?* arises from the antisymmetric combination of the two platinum dz2 orbitals and ?(?*) from the symmetric combination of ?* orbitals of the two L ligands.All the complexes show luminescence in both the solid state and in solution.Both 1 and 2 display 3m.l.c.t. emission in solution at room temperature.The solid state emission of 1 and both the solid-state and fluid-state emission of 3 are assigned to the 3m.m.l.c.t. 3?*)*)> state.The crystal structure of 2 shows an intermolecular ?-? interaction between two L ligands as evidenced by the intermolecular ligand plane separation of 3.35 Angstroem.The solid-state emission of 2 is suggested to arise from a ?-? excimeric interaction of the L ligands.The crystal structure of 3 shows discrete 2+ units with an intramolecular Pt-Pt separation of 3.2703 Angstroem.