The triplet state of orotic acid has been studied by flash photolysis. The rate for dimerization has been observed to vary from 2 × 10 9 M ‐1 sec ‐1 at pH 1 where both the triplet and ground state molecules are neutral, to under 10 8 M ‐1 sec ‐1 above pH 9 where both the triplet and ground state molecules are doubly ionized. The p K of the triplet state has been measured as 4.6. The rate of oxygen quenching for the triplet is 2–3 × 10 9 M ‐1 sec ‐1 while the rate of radiationless decay in solution is 0.73 × 10 4 sec ‐1 . The triplet absorption spectra have been measured for the two ionic forms of the triplet.
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Herbert et al. (1971) studied this question.
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