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Ag_2ClNO_3晶体属正交晶系,空间群为D_(2h)~(16)—Pnma,晶胞参数为:a=6.657(2),b=5.108(1),c=12.490(8),z=4。在1964年,我们曾用Weissenberg照相法收集强度数据,用Patterson函数法和电子密度函数法初步测定了晶体结构。最近用PW-1100型四圆衍射仪重新收集强度数据,用分块对角矩阵最小二乘方法精化,得较精确的结构参数,R=0.046,关于Ag,Cl和NO_3~-的配位情况示于图3,4,5中。Ag_2ClNO_3和Ag_2BrNO_3是同晶型晶体,结构中均存在曲折的链型[AgX]_n分子,和α轴平行,如图6所示,在分子中Ag-Cl和Ag-Br的平均键长分别为2.613和2.679。
The crystal structure of Ag_2ClNO_3 belongs to the orthorhombic crystal system with space group D 2h ~ (16) -Pnma. The unit cell parameters are a = 6.657 (2), b = 5.108 (1), c = 12.490 4. In 1964, we collected the intensity data using the Weissenberg photographic method. The crystal structure was initially determined using the Patterson function method and the electron density function method. Recently, the intensity data were collected again with the PW-1100 four-circle diffractometer and refined by block-diagonal matrix least-squares method to get more accurate structural parameters, R = 0.046. For the coordination of Ag, Cl and NO_3 ~ The situation is shown in Figures 3,4,5. Ag_2ClNO_3 and Ag_2BrNO_3 are isomorphic crystals, both of which have a meandering chain type [AgX] _n and are parallel to the α axis. As shown in Fig. 6, the average bond lengths of Ag-Cl and Ag-Br in the molecule are 2.613 and 2.679.