X-Ray analyses of free base, zinc, and nickel complexes of 2,3;7,8;12,13;17,18-tetrakis(6,13-dihydro-6,13-pentaceno)-21H,23H-porphine revealed that the porphyrin chromophores adopted a heavily-saddled conformation by interlocking of the biconcave porphyrins in the crystals containing halobenzenes as crystalline solvents, while the ring was almost flat in the crystals obtained from benzene or from chlorobenzene and isopropanol.
17,18-四(6,13-二氢-6,13-五并烯)-21H,23H-卟吩的 X 射线分析表明,在以卤代苯为结晶溶剂的晶体中,
卟啉的发色团通过双凹
卟啉的交错而形成了一个严重鞍状的构象,而在以苯或
氯苯和
异丙醇为溶剂的晶体中,环几乎是平的。