Abstract
We investigated solvent and substituent effects on excimer emission of Pt(dpb)Cl (dpbH = 1,3-di(2-pyridyl)benzene). The excimer emission quantum yield (ϕD) were varied from 26% in CH3CN, 15% in (CH3)2CO, 8.5% in CH2Cl2, 6.0% in MeOH, 5.6% in EtOH, and 2.2% in 2-PrOH, and the excimer emission lifetimes (τD~1 μs) in the non-alcoholic solvents were slightly longer than those in the alcoholic solvents. Excimer emissions in the non-alcoholic solvents were peaking at ~710 nm red-shifted from those in the alcoholic solvents (λD ~700 nm). The attachment of F to phenyl moiety in ligand contributed to the increase in ϕD: 20% for Pt(F2dpb)Cl (F2dpbH = 4,6-difluoro-1,3-di(2-pyridyl)benzene), 16% for Pt(Fdpb)Cl (FdpbH = 4-fluoro-1,3-di(2-pyridyl)benzene) in (CH3)2CO, whereas it caused the decrease in τD and no-remarkable shift of λD. Introduction of methyl groups to pyridyl moieties effectively contributed to the blue-shift of spectrum and the remarkable increase in ϕD; that is, ϕD = 74% was evaluated for Pt(Fmdpb)Cl (FmdpbH = 4-fluoro-1,3-di(4-methyl-2-pyridyl)benzene) in CHCl3, which could be compared with the monomer emission quantum yield ϕM = 71%. In addition, the trimer emission quantum yield was evaluated as ϕT = 41% for the complex.
Published Version
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