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A rare case of solution and solid state inter-conversion of two copper(II) dimers and a copper(II) chain |
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| Authors: | Subrata Naiya,Saptarshi Biswas,Carlos J. Gó mez-Garcí a |
| Affiliation: | a Department of Chemistry, University College of Science, University of Calcutta, 92, APC Road, Kolkata 700 009, India b Susil Kar College, Ghoshpur, Champahati, Baruipur, 24 Parganas(S), West Bengal 743 330, India c School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG 66AD, UK d Instituto de Ciencia Molecular (ICMol), Parque Científico, Universidad de Valencia, 46980 Paterna, Valencia, Spain |
| Abstract: | Three Cu(II)-azido complexes of formula [Cu2L2(N3)2] (1), [Cu2L2(N3)2]·H2O (2) and [CuL(N3)]n (3) have been synthesized using the same tridentate Schiff base ligand HL (2-[(3-methylaminopropylimino)-methyl]-phenol), the condensation product of N-methyl-1,3-propanediamine and salicyldehyde). Compounds 1 and 2 are basal-apical μ-1,1 double azido bridged dimers. The dimeric structure of 1 is centrosymmetric but that of 2 is non-centrommetric. Compound 3 is a μ-1,1 single azido bridged 1D chain. The three complexes interconvert in solution and can be obtained in pure form by carefully controlling the synthetic conditions. Compound 2 undergoes an irreversible transformation to 1 upon dehydration in the solid state. The magnetic properties of compounds 1 and 2 show the presence of weak antiferromagnetic exchange interactions mediated by the double 1,1-N3 azido bridges (J = −2.59(4) and −0.10(1) cm−1, respectively). The single 1,1-N3 bridge in compound 3 mediates a negligible exchange interaction. |
| Keywords: | Copper(II) Schiff base Antiferromagnetic Crystal transformation μ-1,1 Single azido bridged |
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