Nickel complexes with tris(2-aminoethyl)amine (tren):: [Ni3(tren)4(H2O)2][Cr(ox)3]2•6H2O (ox = oxalate), {[Ni2(tren)3][ClO4]4•H2O}n, and [Ni2(tren)2(aepd)][ClO4]4•2H2O (aepd = N-(2-aminoethyl)pyrrolidine-3,4-diamine).: Synthesis, structure and magnetism

被引:16
作者
Masters, VM
Bernhardt, PV
Gahan, LR [1 ]
Moubaraki, B
Murray, KS
Berry, KJ
机构
[1] Univ Queensland, Dept Chem, Brisbane, Qld 4072, Australia
[2] Monash Univ, Dept Chem, Clayton, Vic 3168, Australia
[3] Westernport Secondary Coll, Hastings, Vic 3915, Australia
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 1999年 / 14期
关键词
D O I
10.1039/a901659g
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Reaction of K-3[Cr(ox)(3)] (ox = oxalate) with nickel(II) and tris(2-aminoethyl)amine (tren) in aqueous solution resulted in isolation of the bimetallic assembly [Ni-3(tren)(4)(H2O)(2)][Cr(ox)(3)](2). 6H(2)O. The polymeric complex {[Ni-2(tren)(3)][ClO4](4). H2O}(n) has been prepared by reaction of nickel(II) perchlorate and tren in aqueous solution. From the same reaction mixture the complex [Ni-2(tren)(2)(aepd)][ClO4](4). 2H(2)O (aepd = N-(2-aminoethyl)pyrrolidine-3,4-diamine), in which a bridging tren ligand contains a carbon-carbon bond between two arms forming a substituted pyrrolidine, has been isolated. The complexes have been characterized by X-ray crystallography. The magnetic susceptibility (300-4.2 K) and magnetization data (2, 4 K, H = 0-5 T) for {[Ni-2(tren)(3)][ClO4](4). H2O}(n) (300 K , 4.23 mu(B)) exhibit evidence of weak antiferromagnetic coupling and zero field splitting (2J = -1.8 cm(-1); \ D\ = 2 cm(-1)) at low temperature. For [Ni-3(tren)(4)(H2O)(2)][Cr(ox)(3)](2). 6H(2)O the susceptibility data at 300 K are indicative of uncoupled nickel(II) and chromium(III) sites with zero-field splitting and intramolecular antiferromagnetic coupling predicted at low temperature.
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页码:2323 / 2328
页数:6
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