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Structural and spectroscopic characterizations of tetra-nuclear niobium(V) complexes of quinolinol derivatives

, , , and . SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY (June 2015)

Abstract

Reactions between niobium ethoxide and 8-hydroxy-2-methylquinoline or 5-chloro-8-hydroxyquinoline have been explored. Two new tetranuclear heteroleptic niobium complexes containing oxo, ethoxo, and quinolinate chelate rings have been synthesized and characterized by H-1, C-13 and Nb-93 NMR, UV-Vis, and FT-IR spectroscopies, and single-crystal X-ray diffraction. The molecular structures of the niobium complexes, Nb-4(mu-O)(4)(mu-OEt)(2)(ONC10H8)(2)(OEt)(8)(I) and Nb-4(mu-O)(4)(P-OEt)(2)(ONC9H5Cl)(2)(OEt)(8) (II), are composed of a pair of edge-sharing bioctahedral moieties in which connected via two almost linear oxo-bridges, with a large difference in the NbO distances. Single-crystal structures showed both complexes are centrosymmetric and contain two distinct Nb centers, and results confirmed by observation of two niobium signals in the Nb-93 NMR spectra of complexes. (C) 2015 Elsevier B.V. All rights reserved.

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ISI:000352668100025
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