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The laser photolysis of N-diisopropyl phosphoryl tryptophyl tyrosine dipeptide methyl ester (N-DiPP-TrpH-TyrOH) has been carried out utilizing a KrF(248 nm) laser . The direct intramolecular ET between TrpH+ residue and TyrOH residue was detected first and the ET between Trp and TyrOH became slow. It was suggested that phosphoryl group stabilize neighbour radical of aromatic ring by hyperconjugation. In combination with computer modeling we obtained the kinetic parameters of the ET and proved that phosphoryl groups took part in the process of ET. The results should be significant for biological system since every biological process involves the phosphorylation or nonphosphorylation.
The laser photolysis of N-diisopropyl phosphoryl tryptophyl tyrosine dipeptide methyl ester (N-DiPP-TrpH-TyrOH) has been carried out out utilizing a KrF (248 nm) laser. The direct intramolecular ET between TrpH + residue and TyrOH residue was detected first and the ET between Trp and TyrOH became slow. It was suggested that phosphoryl group stabilize neighboring radical of aromatic ring by hyperconjugation. In combination with computer modeling we obtained the kinetic parameters of the ET and proved that phosphoryl groups took part in the process of ET. results should be significant for biological system since every biological process involves the phosphorylation or nonphosphorylation.