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Leupold, D. and Struck, A. and Stiel, H. and Teuchner, K. and Oberländer, S. and Scheer, Hugo (1990): Excitated state properties of 20-chloro-chlorophyll a. In: Chemical Physics Letters, Vol. 170: pp. 478-484




The excited-state and lasing properties of 20-chloro-chlorophyll a in ether solution were compared to those of chlorophyll a. Desactivation parameters and cross-sections were obtained from non-linear absorption spectroscopy in combination with a physico-mathematical methods package. The Cl substituent at C-20 (1) increases both intersystem crossing and internal conversion, (2) produces a blue-shift of the S1 absorption spectrum, and (3) leads to pronounced photochemistry.