对于络合物3非常高效的DNA光断裂的可能解释是额外牵涉了3MLCT激发态.在E00~2.1eV和E1/2([Ru]2+/+)=-0.46V相对于NHE情况下,对3可以估计一个~1.64V相对于NHE的激发态还原电位,使它成为一种强氧化剂.采用+1.29V相对于NHE作为鸟嘌呤在pH=7的水中的氧化电位,计算得到从3的3MLCT态发生G+-0.35V的良好推动力.由Ru(II)络合物的激发态产生鸟嘌呤氧化以前已证明会导致DNA断裂和加成化合物的形成3a,22.虽然由于鸟嘌呤氧化引起的DNA光断裂对[Ru(hat)3]2+(hat=1,4,5,8,9,12-高荧光量子效率三亚吡嗪),一种与3具有类似激发态还原电位的络合物已做了报道,但80%的DNA损坏要求在436nm处3分钟的辐照22b.如图4a中所示的那样,辐照3仅仅30s就导致了接近定量的DNA断裂.
求翻译A possible explanation for the very efficient DNA photocl
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