Measurement of rate constants for quenching singlet oxygen with aCypridina luciferin analog (2-methyl-6-[p-methoxyphenyl]-3,7-dihydroimidazo[1,2-a]pyrazin-3-one) and sodium azide
✍ Scribed by Mashiko, Shinro ;Suzuki, Nobutaka ;Koga, Satoshi ;Nakano, Minoru ;Goto, Toshio ;Ashino, Toshihiko ;Mizumoto, Iwao ;Inaba, Humio
- Publisher
- John Wiley and Sons
- Year
- 1991
- Weight
- 347 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0884-3996
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✦ Synopsis
Abstract
The rate constants for [^1^O~2~] [MCLA] and [^1^O~2~][NaN~3~] were measured by quenching the near‐infrared emission (^1^Δ~g~→^3^∑~g~) in steady state with MCLA and NaN~3~, respectively. ^1^O~2~ was constantly generated by energy transfer to O~2~ from Ar laser‐excited Rose Bengal. The Stern—Volmer plots yielded the second‐order rate constants of 2.94 × 10^9^ M^−1^ S^−1^ and 3.83 × 10^8^ M^−1^ S^−1^ for quenching ^1^O~2~ with MCLA and NaN~3~ in water at pH 5.4, respectively. The ^1^O~2~ + MCLA reaction emitted light with maximum at 465 nm at pD 4.5 identical to the O~2~^−^ + MCLA reaction.