was studied for 4,5-dimethoxy-2-nitrobenzyl alcohols attached to various leaving groups: amino acids histidine (NHis) and aspartate (NAsp) as well as their fluorenylmethoxycarbonyl derivatives (FHis) and (FAsp). In addition, two peptides containing either of the two amino acids were studied, carrying the photoreactive group attached to a histidine (PHis), or to an aspartate (PAsp). The aci-nitro forms
研究了与各种离去基团相连的4,5-二甲氧基-2-硝基
苄基醇通过
氨基酸从光硝基转化为亚硝基的形式:
氨基酸组
氨酸(NHis)和
天冬氨酸(NAsp)以及它们的
芴基甲氧基羰基衍
生物(FHis )和(FAsp)。此外,研究了含有两个
氨基酸中任一个的两个肽,它们带有与组
氨酸(PHis)或
天冬氨酸(PAsp)相连的光反应性基团。在三重态-三重态三重峰吸收衰减后,类似于其他2-硝基苄基型化合物,在Fhis和FAsp处观察到λ(aci)= 420 nm处最大的α-硝基形式。对于FHis和FAsp而言,光转化Phi(p)的量子产率均为0.03,而对于肽PHis和PAsp则分别为0.01和0.005。