VIBRONIC COUPLING IN POLYENES: HIGH RESOLUTION OPTICAL SPECTROSCOPV OF 2, 10-DIMETHYLUNDECAPENTAENE
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Abstract
We have obtained highly resolved optical spectra of several dimethyl polyenes in n-alkane hosts. Studies of the undecapentaene-nonane system have been completed and reveal several interesting features of polyene excited states. The transitions between the ground and first excited singlet states are induced by low frequency, nontotally symmetric vibrations in agreement with Herzberg-Teller expectations for ``forbidden” transitions. This finding provides strong support for the assignment of the lowest excited singlet state as
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Author Institution: Department of Chemistry, Harvard University