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- W2008587912 abstract "Absorption and emission spectra of Pt(diimine)L2 complexes (diimine = 2,2‘-bipyridine (bpy) or 4,4‘-dimethyl-2,2‘-bipyridine (dmbpy); L = pyrazolate (pz-), 3,5-dimethylpyrazolate (dmpz-), or 3,4,5-trimethylpyrazolate (tmpz-)) have been measured. Solvent-sensitive absorption bands (370−440 nm) are attributed to spin-allowed metal-to-ligand charge-transfer (1MLCT) transitions. As solids and in 77 K glassy solution, Pt(bpy)(pz)2 and Pt(dmbpy)(pz)2 exhibit highly structured emission systems (λmax≈ 494 nm) similar to those of the diprotonated forms of these complexes. The highly structured bands (spacings 1000−1400 cm-1) indicate that the transition originates in a diimine-centered 3(π→π*) (3LL) excited state. The intense solid-state and 77 K glassy solution emissions from 3MLCT[d(Pt)→π*(bpy)] excited states of complexes with dmpz- and tmpz- ligands occur at longer wavelengths (λmax = 500−610 nm), with much broader vibronic structure. These findings are consistent with increasing electron donation of the pyrazolate ligands, leading to a distinct crossover from a lowest 3LL to a 3MLCT excited state." @default.
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- W2008587912 date "2000-05-19" @default.
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- W2008587912 title "Lowest Electronic Excited States of Platinum(II) Diimine Complexes" @default.
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- W2008587912 doi "https://doi.org/10.1021/ic991369w" @default.
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