Figure 1. (a) UV-visible absorption spectrum of pyrimido[5,4-g]pteridine N-oxide 1 (5 X M ) in MeCN. (b) Difference spectrum of the mixture of 1 (5 m M ) and D M A (250 m M ) vs. 1 (5 m M ) in MeCN. (c) Wavelength dependence (presented by the yield of M M A ) in the photochemical demethylation of D M A by 1. A solution of 1 (5 m M ) and D M A (50 m M ) in MeCN was irradiated by using a grating monochromator
图 1. (a)
嘧啶并 [5,4-g] 蝶啶 N-
氧化物 1 (5 XM) 在 MeCN 中的紫外-可见吸收光谱。(b) 1 (5 m M ) 和
DMA (250 m M ) 与 1 (5 m M ) 在 MeCN 中的混合物的差异光谱。(c) 1 (5 m M ) 和
DMA (50 m M ) 在 MeCN 中的 1 (5 m M ) 和
DMA (50 m M ) 溶液用光栅单色仪(JASCO 模型)照射CRM-
FA) 与 2-kW Xe 灯和 4-nm 带宽在
氩气气氛下持续 2 小时。