8,8,9,9-Tetracyano-4,7-indanoquinodimethane and 5-chloro-8,8,9,9-tetracyano-4,7-indanoquinodimethane, the first members of the hitherto unreported family of tetracyanoindanoquinodimethanes, have been synthesized from the corresponding 4,7-indandicarboxylic acids by the method of Yamaguchi. The indan-TCNQs are part of a series of polycyclic TCNQs which include 11,11,12,12-tetracyano-9,10-anthraquinodimethane and 9,9,10,10-tetracyano-1,4-naphthoquinodimethane, that have been prepared in our laboratory. A disadvantage found with the earlier polycyclic TCNQs was to non-coplanarity of their rings and the dicyanomethylene moities: a planar system is essential to efficient electrical conductivity of TCNQs in CT salts. X-ray analysis has shown 8,8,9,9-tetracyano-4,7-indanoquinodimethane to be more planar compared with tetracyanoanthraquinodimethanes and tetracyanonaphthoquinodimethanes. The half-wave potentials of the chlorotetracyanoindanoquinodimethane show it to be a stronger electron acceptor than several known TCNQs and its cyclic voltammogram indicate two single electron reversible redox processes.
8,8,9,9-Tetracyano-4,7-indanoquinodimethane 和 5-chloro-8,8,9,9-Tetracyano-4,7-indanoquinodimethane 是迄今为止尚未报道的四
氰基
茚并喹
二甲胺家族的第一个成员,它们是用相应的 4,7-
茚并二
羧酸通过 Yamaguchi 方法合成的。
茚满-TCNQs 是多环 TCNQs 系列的一部分,这些多环 TCNQs 包括 11,11,12,12 四
氰基-9,10-
蒽醌二
甲烷和 9,9,10,10 四
氰基-
1,4-萘醌二
甲烷。早期多环 TCNQs 的一个缺点是其环和二
氰基亚甲基的非平面性:平面系统对于 CT 盐中 TCNQs 的高效导电性至关重要。X 射线分析表明,与四
氰基
蒽醌二
甲烷和四
氰基萘醌二
甲烷相比,8,8,9,9-四
氰基-4,7-
吲哚醌二
甲烷更加平面。
氯代四
氰基
茚并二
甲烷的半波电位显示,它比几种已知的四
氰基萘醌是更强的电子受体,其循环伏安图显示了两个单电子可逆氧化还原过程。