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Isotope effects on radiationless transitions from the lowest excited singlet state of tetraphenylporphin

✍ Scribed by Yoshizumi Kajii; Kinichi Obi; Ikuso Tanaka; Seiji Tobita

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
268 KB
Volume
111
Category
Article
ISSN
0009-2614

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✦ Synopsis

The deuterium isotope effect on the radiationless transition from the lowest excited sin&t state of tetraphenylporphin has been investigated. Deuteration of the center imino hydrogen atoms of the porphin ring gives rise to large isotope effects. lengthening the fluorescence hfetimes and increasing the fluorescence and triplet quantum yields. These results indicate that N-H vibrations of the center of the porphin ring play an important role in internal conversion.

πŸ“œ SIMILAR VOLUMES

Position-dependent deuterium isotope eff
Position-dependent deuterium isotope effects on the radiationless decay of the triplet state of porphyrin free bases
✍ R.P. Burgner; A.M. Ponte Goncalves πŸ“‚ Article πŸ“… 1977 πŸ› Elsevier Science 🌐 English βš– 334 KB

The cffcct ofdcutcratlon in slowmg the radtationlesc decay of the triplet state of several porphyrin free bxxs is shown to depend critically on the position of deutcration. Deuteration of the N-II positions is one order of magnttude more effective per bond than dcuterdtlon of the rmg pocitions.