dc.creator Gresser, J. en_US dc.creator Vo, K. P. en_US dc.creator Abrahamson, E. W. en_US dc.date.accessioned 2006-06-15T13:14:28Z dc.date.available 2006-06-15T13:14:28Z dc.date.issued 1963 en_US dc.identifier 1963-V-8 en_US dc.identifier.uri http://hdl.handle.net/1811/8350 dc.description $^{1}$ Proceeding of the IV the International Congress of Molecular Spectroscopy, Bologna, 1959, in Adv. in Mol. Spectroscopy, Vol. I, p. 354, Pergamon Press. en_US dc.description Author Institution: Department of Chemistry, Case Institute of Technolgy en_US dc.description.abstract “Many linear and cyclic polyenes which have heteroatoms such as O, N, S. etc conjugated with their $\pi$ electron systems show photochemical activity. Such photochemical reactions usually involve lower excited $n \pi^{*}$ singlet or triplet states, either directly or indirectly, and as a consequence this activity is markedly dependent on thy lifetimes and populations of such electronic states. These factors in turn depend on the relative energetic positions of these excited states and on the efficiencies of the radiationless transitions between them. A number of classes of such polyenes show of wide variation in photochemical activity depending on the position and kind of Substituent interacting with the $\pi$ electron system. As has been suggested by Abrahamson and $Panik^{1}$, the effect of introducing such a substituent into a polyene system is to shift the $\pi, \pi^{*}$ and $n \pi^{*}$ electronic levels, thereby markedly affecting their actual populations and lifetimes and hence their photochemical activity. A study of the comparative photochemical activity, the absorption spectra and fluorescence and phosphorescence behavior of a number of classes of such compounds---particularly the substituted anthraquinoncs and acetophenones---bears out this general principle.” en_US dc.format.extent 131211 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE SPECTROSCOPIC BASIS OF PHOTOCHEMISTRY IN POLYENES CONJUGATED WITH HETEROATOMS en_US dc.type article en_US
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