Di-μ-halo-bis{[tris(2-pyridylmethyl)amine-κ4N]nickel(II)} bis(triethylammonium) tetraperchlorate:: Magnetostructural studies

被引:21
作者
Tong, B
Chang, SC
Carpenter, EE
O'Connor, CJ
Lay, JO
Norman, RE
机构
[1] Univ Louisiana Monroe, Dept Chem, Monroe, LA 71209 USA
[2] Duquesne Univ, Dept Phys, Pittsburgh, PA 15282 USA
[3] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA
[4] US FDA, Natl Ctr Toxicol Res, Div Chem, Jefferson, AR 72079 USA
关键词
crystal structures; nickel(II) complexes; magnetic susceptibility; ferromagnetic coupling;
D O I
10.1016/S0020-1693(99)00591-5
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
[{Ni(TPA)Br}(2)](Clo(4))(2).2HNEt(3)ClO(4), where TPA is tris-(2-pyridylmethyl)amine, crystallizes in the monoclinic space group P2(1)/c with Z = 2, a = 11.531(3) Angstrom, b = 22.141(3) Angstrom, c = 12.511(2) Angstrom and beta = 107.44(1)degrees. The structure was determined at ambient temperature from 5519 reflections (2937 observed) with R = 0.0426 and R-w = 0.0404. The [{Ni(TPA)Br}(2)](2+) core is centrosymmetric with unsymmetrical bridges (Ni-Br=2.504(1) and 2.662(1) Angstrom). Each Ni atom is pseudo-octahedral six-coordinate. Triethylammonium perchlorate cocrystallizes with the metal complex. Magnetic susceptibility studies (fit to the Ginsberg model) indicate the Ni centers are ferromagnetically coupled with J/k = 10.0(5) cm(-1). The chloro complex ([{Ni(TPA)Cl}(2)](Clo(4))(2).2HNEt(3)ClO(4)) is also ferromagnetically coupled with J/k = 7.6(1) cm(-1). (C) 2000 Elsevier Science S.A. All rights reserved.
引用
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页码:855 / 861
页数:7
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