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DOI: 10.1039/A901659G (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 2323-2328

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[hair space]†

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Vanessa M. Masters, Paul V. Bernhardt, Lawrence R. Gahan, Boujemaa Moubaraki, Keith S. Murray and Kevin J. Berry

Abstract

Reaction of K3[Cr(ox)3] (ox = oxalate) with nickel(II) and tris(2-aminoethyl)amine (tren) in aqueous solution resulted in isolation of the bimetallic assembly [Ni3(tren)4(H2O)2][Cr(ox)3]2·6H2O. The polymeric complex {[Ni2(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 [Ni2(tren)2(aepd)][ClO4]4·2H2O (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 {[Ni2(tren)3][ClO4]4·H2O}n (300 K , 4.23 µB) exhibit evidence of weak antiferromagnetic coupling and zero field splitting (2J = –1.8 cm–1; |D| = 2 cm–1) at low temperature. For [Ni3(tren)4(H2O)2][Cr(ox)3]2·6H2O 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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