Abstract
Irradiation of trans-[RuCl(cyclam)(NO)] 2+, cyclam is 1,4,8,11-tetraazacyclotetradecane, at pHs 1–7.4, with near UV light results in the release of NO and formation of trans-[Ru IIICl(OH)(cyclam)] + with pH dependent quantum yields (from ∼0.01 to 0.16 mol Einstein −1) lower than that for trans-[RuCl([15]aneN 4)(NO)] 2+, [15]aneN 4 is 1,4,8,12-tetaazacyclopentadecane, (0.61 mol Einstein −1). After irradiation with 355 nm light, the trans-[RuCl([15]aneN 4)(NO)] 2+ induces relaxation of the aortic ring, whereas the trans-[RuCl(cyclam)(NO)] 2+ complex does not. The relaxation observed with trans-[RuCl([15]aneN 4)(NO)] 2+ is consistent with a larger quantum yield of release of NO from this complex.
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