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Fe(III) and Cu(II) complexes; cyano-bridged dinuclear Cu(II); crystal structures; magnetic study.

This report describes the synthesis and structural characterizations of three new complexes; [Na₃Fe₂(bbp)(Hbbp)(CN)₆(H₂O)₉]4H₂O (1), (Bu₄N)[Fe(bbp)₂].3CH₃OH.2H₂O (2), and a cyano-bridged dinuclear copper(II) complex, [Cu₂(tren)₂(CN)][Fe(bbp)₂]₃ 6CH₃OH.4H₂O (3), where H₂bbp = bis(2-benzimidazolyl) pyridine and tren = tris(2-aminoethyl)amine. X-ray crystallography reveals that the geometry of iron(III) centers in the complex anions of 1–3 is an octahedral, while it is a trigonal bipyramidal around copper(II) center in the complex cation of 3. Both bbp ligands meridionally coordinate iron(III) centers in the complex cations of 2 and 3, while three cyanide ions and bbp (or Hbbp) ligand occupied either of the meridional positions around the metal center in 1. In the dinuclear complex cation of 3, the Cu(II)-CN-Cu(II) bridging region is strictly linear as dictated by the symmetry with Cu...Cu separation of 5.084 (7) A^° . Variable temperature magnetic susceptibility study shows that the cyano-bridge mediates the antiferromagnetic coupling between copper(II) centers with J value of -110 K in 3.

GOUTAM MAHATA¹ ANANGAMOHAN PANJA^{1 2}

1. Department of Chemistry, Gokhale Memorial Girls’ College, 1/1 Harish Mukherjee Road, Kolkata 700 020, India
2. Department of Chemistry, Panskura Banamali College, Panskura 721 152, India

Published

11 August 2020

Manuscript received

5 April 2020

Manuscript revised

23 May 2020

Accepted

26 May 2020