1-2 COMPLEX OF 1,4,7,10,13,16-HEXAOXACYCLOOCTADECANE (18-CROWN-6) WITH N-M-BROMOPHENYLUREA

被引：2
|
作者：
NASTOPOULOS, V [1 ]
GERMAIN, G [1 ]
WEILER, J [1 ]
机构：
[1] CATHOLIC UNIV LOUVAIN,UNITE CHIM PHYS MOLEC & CRISTALLOG,B-1348 LOUVAIN,BELGIUM
来源：
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 1991年 / 47卷
关键词：
D O I：
10.1107/S010827019001424X
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
C7H7BrN2O.1/2C12H24O6, M(r) = 347.2, monoclinic, P2(1)/c, a = 8.910 (3), b = 24.924 (8), c = 8.391 (4) angstrom, beta = 122.00 (1)-degrees, V = 1580.3 (10) angstrom 3, Z = 4, D(x) = 1.46 Mg m-3, lambda-(Mo K-alpha) = 0.71069 angstrom, mu = 2.77 mm-1, F(000) = 712, T = 293 K, final R = 0.067 for 1229 observed reflections. The host 18-crown-6 molecule lies about a crystallographic centre of symmetry. This centre relates the two guest bromophenylurea molecules which lie on either side of the host molecule almost perpendicular to the macrocyclic ring. Each guest molecule is hydrogen bonded to two adjacent O atoms of the crown ether by means of one H atom from each amino group. The complex adopts the biangular conformation of the macrocycle and is evidence for the formation of a discrete 1:2 crown ether-urea molecular complex.
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页码：1546 / 1548
页数：3
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