Study of the Heterocyclic-Substituted Platinum-1, 2-Enedithiolate 3ILCT Excited States by Transient Absorption Spectroscopy. Houten, K. V., Walters, K. K. A, Schanze, K. S K., Pilato, R. S, & Van Houten, K. A Journal of Fluorescence, 10(1):35–40, 2000.
Study of the Heterocyclic-Substituted Platinum-1, 2-Enedithiolate 3ILCT Excited States by Transient Absorption Spectroscopy [pdf]Paper  doi  abstract   bibtex   
The photoluminescent 1,2-enedithiolate complexes, (dppe)Pt\S2C2(2-quinoxaline)(H)\, [L2Pt\S2C2(2-pyridinium)(H)\]+ where L2 = dppm and dppe, [L2Pt\S2C2(4-pyridinium)(H)\]+, [L2Pt\S2C2(N-Methyl-4-pyridinium)(H)\]+ and [L2Pt\S2C2(CH2CH2-N-2-pyridinium)\]+ where L2 = dppm, dppe, and dppp are room temp. dual emitters where the emissions have thiolate to heterocycle p* intraligand charge transfer character (ILCT) singlet and triplet character. The pyridinium complexes have strong triplet-triplet absorption bands at .apprx.400, 520 and 630 nm with a weaker band at 800 nm while (dppe)Pt\S2C2(2-quinoxaline)(H)\ has strong triplet-triplet absorption bands at 385 and 550 nm with weaker bands at 610 and 805 nm. By fitting the decay of the transients to single exponential kinetics, the 3ILCT* lifetimes of the pyridinium complexes where detd. to be 0.7 to 15.9 ms (DMSO) while the 3ILCT* lifetime of (dppe)Pt\S2C2(2-quinoxaline)(H)\ is 2.8 ms (MeCN). The transient absorption spectra of the complexes is affected by the appended heterocycle rather than the bulk of ancillary phosphine ligand or whether the heterocycle is protonated or alkylated. [on SciFinder (R)]

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