Photoinduced bond dissociation of 4-methylcoumarin derivatives in solution studied by laser flash photolysis and DFT calculations

…, S Nakajima, S Tero-Kubota, B Marciniak

Index: Yamaji, Minoru; Ogasawara, Michiyo; Kikuchi, Kazuhiro; Nakajima, Satoru; Tero-Kubota, Shozo; Marciniak, Bronislaw; Nozaki, Koichi Physical Chemistry Chemical Physics, 2007 , vol. 9, # 25 p. 3268 - 3275

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Citation Number: 11

Abstract

Photochemical properties of 4-coumarinylmethyl derivatives (CM− X, X= Br, Cl, OH, OPh, SH, and SPh) in solution were studied by laser flash photolysis and DFT calculations. It was found that CM− Br and CM− SPh undergo photoinduced bond dissociation in the lowest excited singlet state, yielding the 4-coumarinylmethyl radical (CMR) and the corresponding radical with quantum yields of∼ 0.25. Laser flash photolysis of CM− Cl, OH, OPh, and SH ...