3 + 3型吡唑基扩展卟啉22 H 4的合成,六卟啉类似物称为暹罗双卟啉,及其同双金属抗磁性镍(II)和顺磁性铜(II)配合物22 Ni 2和22 Cu 2。进行说明。由四个吡咯和两个吡唑都由单个碳原子连接的大环的结构可以解释为两个相连的卟啉样亚基,两个相对的吡唑充当融合点。可变温度1D和2D NMR光谱分析表明22 H 4具有构象灵活的结构。NMR和UV / Vis光谱学证据以及结构参数证明了大环是非芳香族的,尽管分子的每一半都是完全共轭的。用酸对游离碱大环的UV / Vis和NMR光谱滴定表明它是二元的。在络合物中,每个金属离子都通过类似卟啉的双阴离子{N 4}装订口袋。单晶衍射法阐明了双金属和两种金属配合物的固态结构。这三个结构的构象彼此相似,并强烈扭曲,使分子具有手性。游离碱的质子化形式和两种金属络合物中的持续螺旋扭曲允许通过手性相上的HPLC拆分这些对映异构体。22 H 6 2 +,22
Variation of two out of the six meso-aryl groups in Siamese-twinporphyrin, an expandedporphyrin incorporating two pyrazole moieties, identified a set of substituents that result in optimized preparation of highly crystalline products. Electron-donating and electron-withdrawing aryl substituents have only negligible electronic and structural influences on the free-base macrocycles (as measured by