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Aromatic N-oxide bridged copper(II) coordination polymers: Synthesis, characterization and magnetic properties
Rupam Sarma1, Athanassios K Boudalis2, Jubaraj B Baruah1
1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India.
Abstract:
The complexes [Cu2(o-NO2-C6H4COO)4(PNO)2] (1), [Cu2(C6H5COO)4(2,2'-BPNO)] (2), [Cu2(C6H5COO)4(4,4'-BPNO)] (3), [Cu(p-OH-C6H4COO)2(4,4'-BPNO)2·H2O] (4), (where PNO = pyridine N-oxide, 2,2'-BPNO = 2,2'-bipyridyl-N,N'-dioxide, 4,4'-BPNO = 4,4'-bipyridyl-N,N'-dioxide) are prepared and characterized and their magnetic properties are studied as a function of temperature. Complex 1 is a discrete dinuclear complex while complexes 2-4 are polymeric of which 2 and 3 have paddle wheel repeating units. Magnetic susceptibility measurements from polycrystalline samples of 1-4 revealed strong antiferromagnetic interactions within the {Cu2}4+ paddle wheel units and no discernible interactions between the units. The complex 5, [Cu(NicoNO)2·2H2O] ·4nH2O, in which the bridging ligand to the adjacent copper(II) ions is nicotinate N-oxide (NicoNO) the transmitted interaction is very weakly antiferromagnetic.
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