Abstract
The ground-state absorption cross-sections ( σ g), triplet excited-state absorption cross-section ( σ T) at 532 nm, singlet excited-state absorption cross-sections ( σ s) at various visible wavelengths, singlet and triplet excited-state lifetimes, and triplet quantum yields of three cyclometalated platinum(II) 4,6-diphenyl-2,2′-bipyridyl complexes, are reported. The presence of metal–metal and π–π interactions in the dinuclear and trinuclear complexes results in a significant increase in their respective σ g’s in the visible spectral region. As a result, the ratio of σ s/ σ g and σ T/ σ g at each wavelength is significantly greater for the mononuclear complex than for the dinuclear and the trinuclear complexes.
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