F-ELEMENT CROWN ETHER COMPLEXES .27. THE SYNTHESIS AND CRYSTAL-STRUCTURE OF [CE(NO3)3(OH2)(12-CROWN-4)].12-CROWN-4

被引：6
|
作者：
ROGERS, RD
ROLLINS, AN
ETZENHOUSER, RD
HENRY, RF
机构：
[1] Department of Chemistry, Northern Illinois University, DeKalb, IL
来源：
JOURNAL OF INCLUSION PHENOMENA AND MOLECULAR RECOGNITION IN CHEMISTRY | 1990年 / 8卷 / 04期
关键词：
12-crown-4; cerium nitrate complex; X-ray crystal structure;
D O I：
10.1007/BF01041193
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A unique cerium nitrate complex, [Ce(NO3)3(OH2)(12-crown-4)]-12-crown-4, has been crystallized from the reaction of hydrated cerium nitrate and 12-crown-4. It crystallizes in the orthorhombic space group, Pnma, with (at -150°C)a = 22.901(5), b = 13.547(3), c = 8.422(1)Å, and Dx = 1.77 g cm-3 for Z = 4 formula units. A final R value of 0.048 was obtained utilizing 2059 unique observed [Fo ≥ 5σ(Fo)] reflections. The Ce atom resides on a crystallographic mirror plane and is 11-coordinate, coordinated to three bidentate nitrate groups, one water molecule and the four oxygens of one 12-crown-4 molecule. The water molecule hydrogen bonds a second 12-crown-4 unit. Both unique crown molecules and one of the nitrate anions are severely disordered. © 1990 Kluwer Academic Publishers.
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页码：375 / 382
页数：8
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