X-ray crystal structure of Cu2(medpco-2H)Cl2, (medpco = N,N′-bis(2-N,N-dimethylaminoethyl)pyridine-2,6-dicarboxamide 1-oxide. Copper(II) complexes of a deprotonated binucleating pyridine N-oxide ligand |
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Authors: | Michael Antolovich David J. Phillips A. David Rae |
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Affiliation: | School of Chemistry, University of New South Wales, Kensington, NSW 2033, Australia |
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Abstract: | The X-ray structure is reported for the complex Cu2(medpco-2H)Cl2, (medpco = N,N′-bis-N,N-dimethylaminoethyl)pyridine-2,6-dicarboxamide 1-oxide. The complex is triclinic, , a=8.313(4), B=11.403(5), C=11.611(3) Å, =91.66(3), β=108.99(4), γ=109.60(3)° and Z=2. The deprotonated ligand (medpco-2H)2− acts as a binulceating ligand, producing an N-oxide-bridged complex. Each copper in Cu2(medpco-2H)Cl2 is five-coordinate, being coordinated by a bridging N-oxide oxygen, a deprotonated amide nitrogen, a tertiary amine nitrogen and two bridging chlorides. The complex does not exhibit significant magnetic interaction, and this may be the result of distortion of the bridging geometry from planarity. A range of other, apparently N-oxide-bridged, complexes of the type Cu2(medpco-2H)X2 is reported. The complex Cu2(medpco-2H)Br2·H2O is strongly antiferromagnetic, with magnetic data closely fitting the expected binuclear structure. |
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Keywords: | Crystal structures Copper complexes Binucleating ligand complexes Dinuclear complexes |
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