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Studies of UV photochemistry and transition moment directions of 4,5′,8-trimethyl-psoralen (TMP) by means of polarized infrared ATR spectroscopy |
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| Authors: | Zsuzsa Laczk Lszl Harsnyi |
| Institution: | Hungarian Academy of Sciences, Research Laboratory for Inorganic Chemistry, Department of Structural Studies, H-1431 Budapest, Pf. 117 Hungary Hungarian Academy of Sciences, Institute of Isotopes, H-1121 Budapest, Konkoly Thege M. ut 29/33 Hungary Semmelweis Medical University, Institute of Biophysics, H-1088 Budapest, Puskin u. 9 Hungary |
| Abstract: | The UV homodimerization of 4,5′,8-trimethyl-psoralen (TMP) both in a solvent and in crystalline thin layers has been investigated. In the crystalline phase, TMP was found to dimerize completely to the trans—anti stereoisomer. On the basis of polarized IR ATR spectra of thin layers deposited onto a KRS-5 plate, both the monomer and the dimer of TMP were found to have well-defined orientations. The directions of several transition moments have been calculated. On irradiating TMP in solution, the photochemical reaction results in the cis—syn stereoisomer. |
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