# 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

Files Size Format View
1984-RH-03.jpg 564.6Kb JPEG image

 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 Publisher: Ohio State University 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. Description: $^{1}$ P.K. Das and R.S. Becker, J. Phys. Chem., 86, 921 (1982). Author Institution: Department of Chemistry, University of Connecticut URI: http://hdl.handle.net/1811/16759 Other Identifiers: 1984-RH-3