Orientational disorder in Lambda-cobalt(III) sepulchrate trinitrate.

Orientational disorder in Lambda-cobalt(III) sepulchrate trinitrate.
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拉姆达-钴(III)坟墓三硝酸盐的定向障碍

DOI:
10.1107/s0108270110005755
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发表时间:
2010
期刊:
Acta crystallographica. Section C, Crystal structure communications
影响因子:
--
通讯作者:
F. K. Larsen
F. K. Larsen
中科院分区:
--
文献类型:
--
作者:
A. Schönleber;S. van Smaalen;F. K. Larsen

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N-(1,3,6,8,10,13,16,19-八氮杂双环[6.6.6]二十烷)三硝酸钴(III)[Co(C12 H30 N8)](NO3)3的晶体结构由作为Co 3+阳离子的大双环氮笼的sepulchrate部分和三个硝酸根阴离子组成,Co 3+阳离子由N原子六配位。Co-sepulchrate基团位于一个三重轴上(位置对称性32),两个有序的硝酸根基团也是如此(位置对称性3),它们通过N-H-O氢键连接[Co-N = 5.1452(12)<$]。  第三个硝酸根基团是无序的,这是由于原点周围的对称性要求(位点对称性32),并且远离Co-sepulchrate笼[Co-N = 6.3160(8)N]。  的结构是通过应用取向无序超过6个等价的取向的无序硝酸盐基团,这被认为是一个理想的平面分子的规则三角几何形状与其分子平面旋转的ab平面和分子的重心稍微偏离原点。这种新的无序模型明显改善了以前的晶体结构测定。
The crystal structure of Λ-(1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]eicosane)cobalt(III) trinitrate, [Co(C12H30N8)](NO3)3, consists of a sepulchrate moiety that serves as a macrobicyclic nitrogen cage for the Co3+ cation, which is six-coordinated by N atoms, and three nitrate anions. The Co–sepulchrate group lies on a threefold axis (site symmetry 32), as do two symmetry-related and ordered nitrate groups (site symmetry 3), with which it is connected via N—H⋯O hydrogen bonds [Co—N = 5.1452 (12) Å]. The third nitrate group is disordered as a result of symmetry requirements around the origin (site symmetry 32), and is further away from the Co–sepulchrate cage [Co—N = 6.3160 (8) Å]. The structure is described by applying orientational disorder over six equivalent orientations for the disordered nitrate group, which is considered as an ideal planar molecule of regular trigonal geometry with its molecular plane rotated out of the ab plane and the molecular centre of gravity slightly shifted away from the origin. This new model for disorder clearly improves a previous crystal structure determination.
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影响因子: 15
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