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Issue 9, 2006

Heterometallic trinuclear CuIIMIII2 (M = Fe or Cr) complexes with novel bridges and unusual magnetic properties

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Abstract

Three new trinuclear complexes based on [Cu(Ln)]2+ (L1 = 1,5,8,12-tetramethyl-1,3,6,8,10,13-hexaazacyclotetradecane, L2 = 1,3-propanediamine (tn)) and [M(bpb)(CN)2] (bpb2− = 1,2-bis(pyridine-2-carboxamido)benzenate, M = Fe or Cr) have been synthesized and characterized structurally and magnetically. The Cu(II) ions adopt an axially-elongated octahedron with four N atoms from the Ln ligands occupying the equatorial plane and another two atoms (cyano nitrogen atoms or amide oxygen atoms) from two [M(bpb)(CN)2] moieties at the axial positions, resulting in a neutral linear trinuclear complex. Magnetic studies show that the CuFe2 compound bridged by the amido group exhibits ferromagnetic behaviour. The two cyano-bridged CuFe2 or CuCr2 compounds show unusual magnetic properties: weak antiferromagnetic Cu(II)–Fe(III) coupling and negligible Cu(II)–Cr(III) magnetic exchange, proved by the results of the field dependence of magnetization.

Graphical abstract: Heterometallic trinuclear CuIIMIII2 (M = Fe or Cr) complexes with novel bridges and unusual magnetic properties

Supplementary files

Article information


Submitted
18 Apr 2006
Accepted
10 Jul 2006
First published
07 Aug 2006

New J. Chem., 2006,30, 1327-1332
Article type
Paper

Heterometallic trinuclear CuIIMIII2 (M = Fe or Cr) complexes with novel bridges and unusual magnetic properties

B. Zhang, Z. Ni, A. Cui and H. Kou, New J. Chem., 2006, 30, 1327 DOI: 10.1039/B605521D

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