A novel copper(II) complex of a tripodal ligand with phenolate-phenol interligand, intramolecular hydrogen bonding

A novel tripodal ligand with three different arms, viz., pyridine, phenol and an oxime and its copper(II) complex were synthesised. The X-ray crystal structure of the compound reveals that it is a dinuclear complex consisting of two copper(II) ions doubly bridged by two oximato groups in a trans arr...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2009-01 (38), p.8111-8116
Main Authors: Mathrubootham, Vaidyanathan, Addison, Anthony W, Holman, K Travis, Sinn, Ekkehard, Thompson, Laurence K
Format: Article
Language:English
Subjects:
Copper - chemistry
Crystallography, X-Ray
Hydrogen Bonding
Hydroxybenzoates - chemistry
Ligands
Magnetic Resonance Spectroscopy
Magnetics
Molecular Conformation
Organometallic Compounds - chemical synthesis
Organometallic Compounds - chemistry
Phenols - chemistry
Spectrophotometry, Ultraviolet
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Summary:A novel tripodal ligand with three different arms, viz., pyridine, phenol and an oxime and its copper(II) complex were synthesised. The X-ray crystal structure of the compound reveals that it is a dinuclear complex consisting of two copper(II) ions doubly bridged by two oximato groups in a trans arrangement. The complex contains unusual cis-axially coordinated phenolates as well as a novel interligand, intramolecular phenolate-phenol hydrogen bond. Variable-temperature magnetic susceptibility measurements revealed that the two copper(II) centers are strongly antiferromagnetically coupled, with the exchange coupling constant -2J = 800(42) cm(-1) (H = -2J S(1) x S(2)) for the two interacting S = 1/2 centres. The complex yields an (1)H NMR spectrum in CD(3)CN solution at room temperature, with relatively sharp signals and rather small hyperfine shifts, evidencing that the antiferromagnetically coupled dinuclear core is maintained in solution.
ISSN:1477-9226
1477-9234
DOI:10.1039/b910188h