Liu Yanju, Liu Kai, Cao Zhiqiang, Niu Meiju
Acta Crystallogr Sect E Struct Rep Online. 2011 May 1;67(Pt 5):o1074. doi: 10.1107/S1600536811012219. Epub 2011 Apr 7.
The title compound, C(28)H(28)N(2)O(4), crystallizes in a zwitterionic form with deprotonated naphthol hy-droxy groups and protonated imine N atoms. The asymmetric unit contains one half-mol-ecule located on a twofold rotation axis. Intra-molecular N-H⋯O hydrogen bonds occur and the two bicyclic ring systems form a dihedral angle of 64.2 (1)°. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the bc plane.
标题化合物C(28)H(28)N(2)O(4)以两性离子形式结晶，其中萘酚羟基去质子化，亚胺氮原子质子化。不对称单元包含位于二重旋转轴上的半个分子。分子内存在N-H⋯O氢键，两个双环系统形成的二面角为64.2 (1)°。在晶体中，弱的分子间C-H⋯O氢键将分子连接成平行于bc平面的层。
