Dalton Transactions
نویسندگان
چکیده
Xand 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-phenyl2-oxazoline] ligand and bearing different counterions (chloride versus triflate); labelled [Cu(1a–c)]. The geometry of the two heteroleptic complexes, [Cu(1a)] and [Cu(1c)], depended on the choice of counterion. Formation of the homoleptic complex was only evident when the Cu(OTf)2 salt was used (Cu(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 F and H couplings confirmed the presence of both coordinated water and TfO counterions in [Cu(1a)].
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