An axially elongated copper(II) complex, CuL1Cl2, has been obtained by reaction of copper(II) chloride with a 17-membered N,O-donor macrocyclic ligand (L1). In an attempt to prepare the complex from copper(II) perchlorate, crystals of L1 suitable for X-ray were obtained as its diperchlorate salt, [H2L1][ClO4]2. Further reaction of CuL1Cl2 with LiTCNQ and Et3NH(TCNQ)2 furnished the charge transfer copper(I) complexes CuL1(TCNQ)2·3H2O and CuL1(TCNQ)3, with TCNQ carrying partially reduced charge. The presence of a diamagnetic metallic centre was confirmed by EPR and magnetic measurements.
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Kaur et al. (2006) studied this question.
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