Spectroscopic and structural characterizations of water-soluble peroxo complexes of niobium(V) with N-containing heterocyclic ligands |
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| Affiliation: | 1. Department of Chemistry, Henan Institute of Education, Zhengzhou 450046, China;2. Department of Public Teaching, Nanyang Medical College, Nanyang 473061, China;3. College of Chemistry and Pharmacy Engineering, Nanyang Normal University, Nanyang 473061, China;4. Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;1. Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai -400 076 India |
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| Abstract: | New water-soluble heteroleptic peroxo complexes of niobiumV have been prepared with N-containing heterocyclic ligands. The compounds correspond to the general formula (gu)x[Nb(O2)3(L)] · nH2O (gu = guanidinium). Three different ligands (L) have been used: picolinic acid (Hpic), picolinic acid N-oxide (HpicO) and pyrazine 2,5-dicarboxylic acid (2,5-H2pzdc). The NbV complexes have been characterized on the basis of elemental and thermal analysis as well as by IR and ESI-mass spectrometry. The crystal structure of the peroxo complex with the picolinato N-oxide ligand, (gu)2[Nb(O2)3(picO)] (II) has been determined, showing an eightfold-coordinated Nb atom surrounded by three peroxide groups and a picO ligand bound in a bidentate mode via the carboxylato and the N-oxide groups. The coordination polyhedron around the metal is a triangular dodecahedron. |
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