# SOLID STATE ELECTRONIC SPECTRA OF RETENOIC ACID CRYSTALS

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 Title: SOLID STATE ELECTRONIC SPECTRA OF RETENOIC ACID CRYSTALS Creators: Christensen, R. L.; Hudson, Bruce S.; Kohler, Bryan E. Issue Date: 1970 Publisher: Ohio State University Abstract: Polarized low-temperature absorption, excitation and emission spectra of single crystals of all-trans retenoic acid will be discussed. Both the monoclinic form and a form optically identical to the triclinic modification have been investigated. These results can be interpreted with reference to the known crystal structure to establishthat the main absorption and emission are polarized along the conjugated chain. The crystal results are consistent with photoselection experiments and indicate that the absorption and emission are of $\pi\pi^{*}$ character. Further quantitative interpretation of the single crystal results in terms of the electronic structure of the free molecule will be presented. Description: Author Institution: Department of Chemistry, Harvard University URI: http://hdl.handle.net/1811/8502 Other Identifiers: 1970-P-7