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Structural and Spectroscopic Characterizations of Tetra-Nuclear niobium(V) Complexes of Quinolinol Derivatives

Structural and Spectroscopic Characterizations of Tetra-Nuclear niobium(V) Complexes of Quinolinol Derivatives

Mostafa M Amini, Yousef Fazaeli, Gholamhossein Mohammadnezhad, Hamid Reza Khavasi

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jun 5;144:192-9.

PMID: 25756687

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 (1)H, (13)C and (93)Nb NMR, UV-Vis, and FT-IR spectroscopies, and single-crystal X-ray diffraction. The molecular structures of the niobium complexes, [Nb4(μ-O)4(μ-OEt)2(ONC10H8)2(OEt)8] (I) and [Nb4(μ-O)4(μ-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 (93)Nb NMR spectra of complexes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP3236826	Niobium(V) ethoxide		3236-82-6	Price

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