Electrostatic properties of cytosine monohydrate from diffraction data.

Electrostatic properties of cytosine monohydrate from diffraction data.
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衍射数据中胞嘧啶一水合物的静电特性。

DOI:
10.1107/s0108768190001343
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发表时间:
1990
期刊:
Acta crystallographica. Section B, Structural science
影响因子:
--
通讯作者:
Craven,BM
Craven,BM
中科院分区:
--
文献类型:
--
作者:
Weber,HP;Craven,BM

文献摘要

被引文献

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氘代胞嘧啶一水合物[4-(2 H2)-氨基-2(1H)-(1-aH)-嘧啶酮],CaHaD 3 N30中的电荷密度分布。D_20,Mr= 134 ~(15),单斜晶系,P_2J_c,a= 7.714(1),B= 9.825(1),c= 7 ~(506)(2)A,fl= 100.52(1),Z= 4。在82(2)K下收集的A= 0.7093(1)/~]。对Stewart刚性赝原子模型进行最小二乘结构精修,得到R(F)= 0.041,所有核位置和H/D各向异性热参数都是由中子衍射确定的固定值。胞嘧啶和水分子都是电中性的,
The charge density distribution in deuterated cytosine monohydrate [4-(2H2)-amino-2 (1H)-(1-aH)-pyrimidinone], CaHaD3N30. D20, Mr= 134" 15, monoclinic, P2Jc, a= 7.714 (1), b= 9.825 (1), c= 7" 506 (2) A, fl= 100.52 (1), Z= 4, has been determined from 1432 X-ray reflections [sin8/,~< 1.15/~-l, Mo Ka, A= 0.7093 (1)/~] collected at 82 (2) K. Least-squares structure refinement assum-ing Stewart's rigid pseudoatom model gave R (F)= 0.041, with all nuclear positions and H/D anisotropic thermal parameters having fixed values previously determined by neutron diffraction. The cytosine and water molecules are both electrically neutral within