作者:Anup Rana、B. Sathish Kumar、Pradeepta K. Panda
DOI:10.1021/acs.orglett.5b01306
日期:2015.6.19
The synthesis of a highly electron-rich decamethoxysapphyrin and its 27-N-benzyl analogue is reported for the first time. The effects of beta-methoxy and 27-N-benzyl substitution on structure, anion binding, absorption, and electrochemical properties were explored in detail. Upon 27-N-benzyl substitution, counteranion-induced structural deformation arises in the diprotonated state, which could be clearly noticed both in solution H-1 NMR study and solid-state structural analysis. This type of anion-induced structural deformation is noted for the first time in beta-substituted sapphyrins. Further, the free base sapphyrins generate singlet oxygen with moderate efficiency (similar to 42%); hence, they may act as good photosensitizers.