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Xianwei Meng, Trisheena Harricharran and Laura J. Juszczak A Spectroscopic Survey of Substituted Indoles Reveals Consequences of a Stabilized 1Lb Transition Photochemistry and Photobiology 89

Version of Record online: 18 SEP 2012 | DOI: 10.1111/j.1751-1097.2012.01219.x

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This spectroscopic study of 14 indole derivatives reveals a trend of increased energetic separation for substitution at the benzyl ring. In particular, the 1La and 1Lb transitions are resolved in the absorption spectrum for 5- and 6-hydroxyindoles in cyclohexane. These experimental results reveal the validity of earlier calculated and deconvoluted transitions. The energetic position of the 1La origin appears at 280 nm for 5-hydroxyindole as shown. This information will aid in determination of relative 1La and 1Lb energetic contributions to fluorescence emission of tryptophan in proteins.

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