Synthesis, Characterization and Thermal Studies of Niobium(V) Complexes of 2-tert-Butylphenol

• Autorzy: Sharma N. , Sharma M. , Kumari M. , Chaudhry S. C.
• Języki publikacji: EN

Abstrakty

EN

Complexes of composition [NbCl4(OC6H4C(CH3)3-2)] and [NbCl3(OC6H4C(CH3)3-2)2] have been synthesized from the reaction of niobium pentachloride with equimolar and bimolar amounts of 2-tert-butylphenol in carbon tetrachloride. The complexes have been characterized by physicochemical, IR, 1H and 13C NMR and UV-VIS spectral studies. Based upon these studies, for complexes mononuclear square-pyramidal geometry around niobium has been proposed. Thermal decompositional behaviour of the complexes has been studied by TG, DTA and DSC techniques. From TG data, the kinetic and thermodynamic parameters viz. energy of activation, frequency factor, order of reaction, entropy of activation etc. have been evaluated using Freeman-Carroll, Coats-Redfern and Horowitz-Metzger equations. The reactions of complexes with a variety of nitrogenous bases (L1–L5) (where L1 = imidazole, L2 = benzimidazole, L3 = N-methylimidazole, L4 = 2,2'-bipyridyl and L5 = 1,10-phenanthroline) yielded 1:1 addition compounds authenticated by analytical and IR spectral studies.

Słowa kluczowe

EN

niobium(V) complexes; 2-tert-butylphenol; kinetics and thermodynamic parameters and nitrogenous bases

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 7
• Strony: 1265--1276
• Opis fizyczny: Bibliogr. 36 poz., rys.

Twórcy

autor

Sharma N.

autor

Sharma M.

autor

Kumari M.

autor

Chaudhry S. C.

• Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla – 171005, India,

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