Modified porphyrin chromophores: Synthesis and spectroscopic properties of nitronaphtho[1,2-b]porphyrins, benzothieno[2,3-b]porphyrins and their metalated derivatives
作者:Timothy D. Lash、Chaminda B. Wijesinghe、Jerad M. Manley、Stephanie M. Park
DOI:10.1016/j.tet.2023.133601
日期:2023.9
complexes. An example of a benzo[b]thiophene-fused porphyrin was also prepared in three steps from 3-nitrothiophene, but the fused heterocyclic unit had virtually no effect on the porphyrin chromophore. This study demonstrates that while fused naphthalene and benzo[b]thiophene units do not significantly affect the electronic structure of porphyrins, the introduction of a suitably placed electron-withdrawing
在1,8-二氮杂双环[5.4.0]十一碳-7-烯存在下,异氰基乙酸酯与二硝基萘反应制备了一系列c-环吡咯。所得硝基萘并吡咯酯与乙酰氧基甲基吡咯缩合,得到二吡咯甲烷,酯基裂解后,在酸催化下与二吡咯甲烷二醛缩合,得到四种异构硝基萘卟啉。与已知的萘酚相比,其中三种异构体的电子光谱仅表现出微小差异[1,2- b]卟啉,尽管在两种情况下索雷带吸收的强度有所降低。然而,当硝基位于远离卟啉核的位置时,紫外-可见光谱显示索雷带区域有两个非常宽的峰以及扭曲的Q带。对于相应的镍(II)、铜(II) 和锌络合物也注意到了这种效应。苯并[ b ]噻吩稠合卟啉的一个例子也是由3-硝基噻吩分三步制备的,但稠合杂环单元实际上对卟啉发色团没有影响。这项研究表明,虽然稠合萘和苯并[ b]噻吩单元不会显着影响卟啉的电子结构,引入适当位置的吸电子基团可以引起深刻的变化。