Issue 36, 2012

Influence of counterions on the structure of bis(oxazoline)copper(ii) complexes; an EPR and ENDOR investigation

Abstract

X- and Q-band EPR and ENDOR spectroscopy was used to study the structure of a series of heteroleptic and homoleptic copper bis(oxazoline) complexes, based on the (−)-2,2′-isopropylidenebis[(4S)-4-phenyl-2-oxazoline] ligand and bearing different counterions (chloride versus triflate); labelled [CuII(1a–c)]. The geometry of the two heteroleptic complexes, [CuII(1a)] and [CuII(1c)], depended on the choice of counterion. Formation of the homoleptic complex was only evident when the CuII(OTf)2 salt was used (CuII(Cl)2 inhibited the transformation from heteroleptic to homoleptic complexes). The hyperfine and quadrupole parameters for the surrounding ligand nuclei were determined by ENDOR. Well resolved 19F and 1H couplings confirmed the presence of both coordinated water and TfO counterions in [Cu(1a)].

Graphical abstract: Influence of counterions on the structure of bis(oxazoline)copper(ii) complexes; an EPR and ENDOR investigation

Supplementary files

Article information

Article type
Paper
Submitted
13 Jun 2012
Accepted
06 Jul 2012
First published
06 Jul 2012
This article is Open Access
Creative Commons BY license

Dalton Trans., 2012,41, 11085-11092

Influence of counterions on the structure of bis(oxazoline)copper(II) complexes; an EPR and ENDOR investigation

M. E. Owen, E. Carter, G. J. Hutchings, B. D. Ward and D. M. Murphy, Dalton Trans., 2012, 41, 11085 DOI: 10.1039/C2DT31273E

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