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Spin-dependent deuterium isotope effect on the decay of the triplet state of a porphyrin free base. NH vibrations as promoting modes

✍ Scribed by A.M. Ponte Goncalves; R.P. Burgner

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 504 KB
Volume: 46
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(77)80636-2

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✦ Synopsis

The radiationless decay rate constants of the zero field spin sublevels of the lowest triplet state of meso-tetra (m-fluorophenyi)porphin free base are reported. The values for the free base deuterated at the N-H positions are also given. Deuteration affects the fast. in-plane spin state more than the ~low in-plane spin state, (knjk a) : (k n~,~)k ° = 0.75. The role of out-ofplane N-H vibrations as promoting modes is discussed in terms of the theory of Metz and co-workers.

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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 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 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.