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Kinetic Spectroscopy of Pyrazolotriazole Azomethine Dyes

DOI: 10.1039/ft9938902385

Source and publish data:

Journal of the Chemical Society - Faraday Transactions p. 2385 - 2390 (1993)

Update date:2022-08-16

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Authors:

Wilkinson, FrancisWilkinson, Francis

Worrall, DavidWorrall, David

McGarvey, DavidMcGarvey, David

Goodwin, AndrewGoodwin, Andrew

Langley, AndrewLangley, Andrew

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Article abstract of DOI:10.1039/ft9938902385

The photophysical properties of pyrazolotriazole azomethine dyes have been investigated using both picosecond and nanosecond flash photolysis.On nanosecond timescales, prompt formation of a photoisomer is observed, the rate of decay of which shows a solvent dependence.In the presence of a triplet sensitiser a triplet pathway to the photoisomer has been established, the yield of isomer from the triplet state being considerably higher than from direct excitation.On picosecond timescales, two transients are observed; the first has a very short, solvent-independent lifetime, while the second has a longer solvent-dependent lifetime.These tw o transients are assigned as states formed during the relaxation of the molecules along the first excited singlet and the ground-state potential-energy surfaces, respectively.Similar kinetic behaviour is observed in a high concentration, high viscosity environment designed to mimic the photographic emulsion, indicating that the photophysical relaxation pathways are still very rapid even in this type of environment.

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Product name:N4,N4-Diethyl-2-methyl-N1-[3-phenyl-pyrazolo[5,1-c][1,2,4]triazol-(7E)-ylidene]-benzene-1,4-diamine

Cas No:136826-19-2

136826-19-2

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