Aromatic N-oxide bridged copper(II) coordination polymers: Synthesis, characterization and magnetic properties |
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| Authors: | Rupam Sarma Jubaraj B Baruah |
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| Institution: | a Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
b Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi Attikis, Greece |
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| Abstract: | The complexes Cu2(o-NO2-C6H4COO)4(PNO)2] (1), Cu2(C6H5COO)4(2,2′-BPNO)]n (2), Cu2(C6H5COO)4(4,4′-BPNO)]n (3), Cu(p-OH-C6H4COO)2(4,4′-BPNO)2·H2O]n (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]n·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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| Keywords: | Coordination polymer Copper(II) complexes 2 2&prime -Bipyridyl-N N&prime -dioxide 4 4&prime -Bipyridyl-N N&prime -dioxide Crystal structure Magnetochemistry |
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