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Position-dependent deuterium isotope effects on the radiationless decay of the triplet state of porphyrin free bases

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

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
334 KB
Volume
46
Category
Article
ISSN
0009-2614

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✦ Synopsis

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.

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## Abstract The proton transfer equilibrium in a series of double Schiff base derivatives of __trans__‐1,2‐diaminocyclohexane in solution and the solid state was studied by means of ^15^N NMR spectroscopy and analysis of the deuterium isotope effect on the chemical shifts Ξ”^15^N(D). The presence of