化学学报 ›› 1983, Vol. 41 ›› Issue (11): 999-1004. 上一篇    下一篇

研究论文

外型-1,4-氧桥-环己基-2,3-二羧酸的晶体及分子结构

韩玉真;徐筱杰;周公度;唐有祺;杨福良;李崇熙   

  1. 北京大学物理化学研究所;北京大学化学系
  • 发布日期:1983-11-15

The crystal and molecular structure of exo-1, 4-epoxy-cyclohexyl-2, 3-dicarboxylic acid monohydrate

HAN YUZHEN;XU XIAOJIE;ZHOU GONGDU;TANG YOUQI;YANG FULIANG;LI CHONGXI   

  • Published:1983-11-15

关键词: 晶体结构测定, 二元羧酸, 矩阵, 环己基, 最小二乘法, 桥环化合物

The crystal of exo-1, 4-epoxy-cyclohexyl-2, 3-liearboxylic acid in monohydrate (C8H10O5.H2O) belongs to monoclinic system, space group P21/n. There are four molecules in an unit cell with parameters α=5.594(3)A, b=11.178(7)A, c=14.675(11)A, β=91.46(5). The three dimensional intensity data were obtained with a Syntex R3 four-circle diffractometer, and the number of the independent diffractions amounted to 1626. The structure was solved by direct method and refined by block-diagonal least-squares method. The final R is 0.072. In the crystal, there are O--H. . .O hydrogen bonds between molesules, to form layer hydrogen bond system. We use the CNDO/2 programmes written by ourselves on Nova-Eclipse computer to compute the electron energy, molecular total energy, dipole moment, the charge density and net charge of each atom of the molecule C8H10O5.

Key words: CRYSTAL STRUCTURE DETERMINATION, DICARBOXYLIC ACID, MATRICES, CYCLOHEXYL GROUP, LEAST SQUARE METHODS, BRIDGE COMPOUNDS

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