%0 Journal Article %1 ISI:000352668100025 %A Amini, Mostafa M. %A Fazaeli, Yousef %A Mohammadnezhad, Gholamhossein %A Khavasi, Hamid Reza %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND %D 2015 %I PERGAMON-ELSEVIER SCIENCE LTD %J SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY %K 8-Hydroxyquinoline} Alkoxide; Niobium; Spectroscopy; Tetranulear; structure; {Crystal %P 192-199 %R 10.1016/j.saa.2015.02.077 %T Structural and spectroscopic characterizations of tetra-nuclear niobium(V) complexes of quinolinol derivatives %V 144 %X 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.

@article{ISI:000352668100025, 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.}}, added-at = {2017-05-10T15:29:29.000+0200}, address = {{THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}}, affiliation = {{Amini, MM (Reprint Author), Shahid Beheshti Univ, Dept Chem, Tehran 1983963113, Iran. Amini, Mostafa M.; Khavasi, Hamid Reza, Shahid Beheshti Univ, Dept Chem, Tehran 1983963113, Iran. Fazaeli, Yousef, NSTRI, AMIRS, Karaj 31485498, Iran. Mohammadnezhad, Gholamhossein, Isfahan Univ Technol, Dept Chem, Esfahan 8415683111, Iran.}}, author = {Amini, Mostafa M. and Fazaeli, Yousef and Mohammadnezhad, Gholamhossein and Khavasi, Hamid Reza}, author-email = {{m-pouramini@sbu.ac.ir mohammadnezhad@cc.iut.ac.ir}}, biburl = {https://www.bibsonomy.org/bibtex/2b0365731543b7b5c35f4e81dada0a88b/hkhavasi}, cited-references = {{AMINI MM, 1990, MATER RES SOC SYMP P, V180, P675, DOI 10.1557/PROC-180-675. Amini MM, 2004, ACTA CRYSTALLOGR E, V60, pM147, DOI 10.1107/S1600536803029556. 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Yang JX, 2012, J MATER CHEM, V22, P24034, DOI 10.1039/c2jm35355e. {[}Anonymous], 1995, INT TABLES XRAY CRYS, VC.}}, doc-delivery-number = {{CF6LL}}, doi = {{10.1016/j.saa.2015.02.077}}, interhash = {bba2c40c4e06d5ce60ef43243975faf6}, intrahash = {b0365731543b7b5c35f4e81dada0a88b}, issn = {{1386-1425}}, journal = {{SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY}}, journal-iso = {{Spectroc. Acta Pt. A-Molec. Biomolec. Spectr.}}, keywords = {8-Hydroxyquinoline} Alkoxide; Niobium; Spectroscopy; Tetranulear; structure; {Crystal}, keywords-plus = {{CRYSTAL STRUCTURE DETERMINATION; RAY SINGLE-CRYSTAL; METAL ALKOXIDES; SOL-GEL; LIGAND; PRECURSORS; TITANIUM; CLUSTERS; CHEMISTRY; BEHAVIOR}}, language = {{English}}, month = {{JUN 5}}, number-of-cited-references = {{61}}, pages = {{192-199}}, publisher = {{PERGAMON-ELSEVIER SCIENCE LTD}}, research-areas = {{Spectroscopy}}, researcherid-numbers = {{Mohammadnezhad, Gholamhossein/F-8582-2017}}, times-cited = {{0}}, timestamp = {2017-05-10T15:29:29.000+0200}, title = {{Structural and spectroscopic characterizations of tetra-nuclear niobium(V) complexes of quinolinol derivatives}}, type = {{Article}}, unique-id = {{ISI:000352668100025}}, usage-count-last-180-days = {{2}}, usage-count-since-2013 = {{19}}, volume = {{144}}, web-of-science-categories = {{Spectroscopy}}, year = {{2015}} }