(1,8-Naphthylene)bispyridines (1) and a related pyridinium compound (2) wee synthesized X-ray crystallographic analysis showed that the two pyridine rings of a 3,3'-(1,8-naphthylene)bispyridine molecule (1a) are in an anti conformation. The more intense, bathochromic absorption band of 1 compared to those of 1-naphthylpyridines (3) were attributed to a decrease of the orbital symmetry. The energy barriers of rotational isomerization of 1 and 2 are nearly equal to that of 1,8-bistolylnaphthalene. (C) 1997 Published by Elsevier Science Ltd.
(1,8-
萘基)双
吡啶(1)及其相关的
吡啶鎓化合物(2)被合成。X射线晶体分析表明,3,3'-(1,8-
萘基)双
吡啶分子(1a)的两个
吡啶环呈反式构型。与1-
萘基
吡啶(3)相比,1的吸收带更强且发生长波红移,这归因于轨道对称性的降低。1和2的旋转异构化能垒几乎与1,8-二
硫基
萘的能垒相同。(C) 1997 由爱思唯尔科学有限公司出版。