Crystal and molecular structures of 2-[1-(2-aminoethyl)-2-imidazolidinylidene]-2-nitroacetonitrile (C<sub>7</sub>H<sub>11</sub>N<sub>5</sub>O<sub>2</sub>) and 2,6-diamino-5-hydroxy-3-nitro-4<i>H</i>-pyrazolo[1,5-<i>a</i>]pyrimidin-7-one monohydrate (C<sub>6</sub>H<sub>6</sub>N<sub>6</sub>O<sub>4</sub>·H<sub>2</sub>O) from X-ray, synchrotron and neutron powder diffraction data
作者:V. V. Chernyshev、A. N. Fitch、E. J. Sonneveld、A. I. Kurbakov、V. A. Makarov、V. A. Tafeenko
DOI:10.1107/s010876819900213x
日期:1999.8.1
The crystal and molecular structures of 2-[1-(2-aminoethyl)-2-imidazolidinylidene]-2-nitroacetonitrile [C(7)H(11)N(5)O(2); space group P2(1)/n; Z = 4; a = 7.4889 (8), b = 17.273 (2), c = 7.4073 (8) Å, beta = 111.937 (6) degrees ], (I), and 2,6-diamino-5-hydroxy-3-nitro-4H-pyrazolo[1,5-a]pyrimidin-7-one monohydrate [C(6)H(6)N(6)O(4).H(2)O; space group P2(1)/n; Z = 4; a = 17.576 (3), b = 10.900 (2),
2- [1-(2-氨基乙基)-2-咪唑啉亚叉基] -2-硝基乙腈[C(7)H(11)N(5)O(2)的晶体和分子结构;空间群P2(1)/ n; Z = 4;a = 7.4889(8),b = 17.273(2),c = 7.4073(8),β= 111.937(6)度],(I)和2,6-二氨基-5-羟基-3-硝基- 4H-吡唑并[1,5-a]嘧啶-7-一水合物[C(6)H(6)N(6)O(4).H(2)O; 空间群P2(1)/ n; Z = 4;使用X射线,同步加速器和中子粉末衍射数据确定了a = 17.576(3),b = 10.900(2),c = 4.6738(6)Å,β= 92.867(8)度,(II)各种方法。这些结构最初是使用网格搜索程序和MRIA程序从Guinier照片中解析的,使用NMR和质谱的先验信息来分析分子的可能几何形状。由于在键合约束的Rietveld精制过程中分子