Synthesis and structures of nitromethane complexes of furanotribenzo-21-crown-7 and dibenzo-21-crown-7

被引:9
作者
Burns, JH
Bryan, JC
Davis, MC
Sachleben, RA
机构
[1] UNIV N CAROLINA, DEPT CHEM, ASHEVILLE, NC 28804 USA
[2] OAK RIDGE NATL LAB, DIV CHEM & ANALYT SCI, OAK RIDGE, TN 37831 USA
来源
JOURNAL OF INCLUSION PHENOMENA AND MOLECULAR RECOGNITION IN CHEMISTRY | 1996年 / 26卷 / 04期
关键词
crown ether; nitromethane complex; coordination isomers; crystal structure;
D O I
10.1007/BF01053538
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Single crystal X-ray diffraction analyses of two nitromethane complexes of furanotribenzo-21-crown-7 (1 and 2) and the nitromethane complex of dibenzo-21-crown-7 (3) are reported. The two nitromethane complexes 1 and 2 are polymorphic in that the macrocyclic ring adopts the 'dentist's chair' conformation in both structures, with a single nitromethane molecule coordinating to either the lower, concave (1) or upper, convex (2) face of the crown ether. Complex 3 adopts an entirely different conformation with a coplanar arrangement of the crown ether oxygen atoms binding a single nitromethane molecule.
引用
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页码:197 / 207
页数:11
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