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By: Dr Mala Sharma and Dr Kumari Bandna.
1Assistant Professor, Department of Chemistry, Sidharth Govt. Utkrisht College Nadaun, Hamirpur, Himachal Pradesh, India
2Assistant Professor, Department of Chemistry, Govt. College Nalagarh, Solan, Himachal Pradesh, India
A niobium(V) complex with the composition [NbCl(OC₆H₄CH(CH₃)₂-2)₄] was synthesized by reacting niobium pentachloride with four equivalents of 2-isopropylphenol in carbon tetrachloride as a solvent, yielding the product in good quantity. The complex was characterized using elemental analysis, molar conductance measurements, IR spectroscopy, ¹H and ¹³C NMR spectroscopy, and mass spectrometry. Spectroscopic results indicate that the complex exists in a dimeric form, with bridging occurring through isopropylphenoxo ligands. X-ray diffraction analysis suggests that the complexes are amorphous in nature.
The methanolic solution of the synthesized complex, monochlorotetrakis(2-isopropylphenoxo)niobium(V), [NbCl(OC₆H₄CH(CH₃)₂-2)₄], reacts with equimolar amounts of potassium benzohydroxamate and p-chlorobenzohydroxamate in benzene to form mixed-ligand phenoxo-hydroxamato niobium(V) complexes. These products were confirmed through physicochemical studies along with IR and ¹H NMR spectral analyses. The spectral evidence indicates that potassium benzohydroxamate and p-chlorobenzohydroxamate effectively cleave the isopropylphenoxo bridging bonds, resulting in the formation of monomeric (unimolecular) complexes.
Citation:
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