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LEVEL ORDERING IN CIS-TRANS ISOMERS OF 2,4,6,8-DECATETRAEN-1-AL AND 2,4,6,8,10-DODECAPENTAEN-1-AL

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/16759

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Title: LEVEL ORDERING IN CIS-TRANS ISOMERS OF 2,4,6,8-DECATETRAEN-1-AL AND 2,4,6,8,10-DODECAPENTAEN-1-AL
Creators: Granville, M. F.; Sheybani, H.
Issue Date: 1984
Abstract: The high resolution ($\sim 5 cm^{-1}$ linewidth) emission and excitation spectra of several cis-trans isomers of the conjugated polyene aldehydes 2,4,6,8-decatetraen-1-al and 2,4,6,8,10-dodecapentaen-1-al in alkane matrices at 4.2K will be presented and interpreted in terms of the energy ordering of the $1 ^{1}A^{\prime \prime} (n^{\ast} \leftarrow n)$ and $2^{1} A^{\prime} (\pi^{\ast} \pi^{\ast} \leftarrow \pi \pi)$ excited states. Based on molar extinction coefficients and low resolution spectra in glasses at 77K, other $workers^{1}$ have shown that the two states are nearly degenerate in the all-trans $C_{10}$ aldehyde, their order being sensitive to the solvent environment, whereas the $2 ^{1}A^{\prime}$ state is lowest in the all-trans $C_{12}$ aldehyde. In this paper, we will discuss the dependence of the state ordering on the geometric configuration of the polyene chain. State assignments will be made on the basis of a complete vibronic analysis of the spectra.
URI: http://hdl.handle.net/1811/16759
Other Identifiers: 1984-RH-3
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