학술논문
Thermoanalytical investigations of niobium(V) complexes of 4-isopropylphenol.
Document Type
Article
Author
Source
Subject
*THERMAL analysis
*NIOBIUM compounds
*METAL complexes
*PHENOL
*THERMOGRAVIMETRY
*CHEMICAL reactions
*CHEMICAL decomposition
*CARBON tetrachloride
*
*
*
*
*
*
*
Language
ISSN
1388-6150
Abstract
Thermal behaviour of newly synthesized niobium(V) aryloxides of composition [NbCl(OCHCH(CH)-4)] (where n = 1 → 5) synthesized by the reactions of niobium pentachloride with 4-isopropylphenol in predetermined molar ratios in carbon tetrachloride has been studied by thermogravimetric (TG) and differential thermal analysis (DTA) techniques. The results showed that thermal decomposition of complex of composition [NbCl(OCHCH(CH)-4)] resulted in the formation of NbOCl as the ultimate decompositional product while all other complexes yielded NbO as the final product of thermal decomposition. From the mathematical analysis of TG data, the kinetic and thermodynamic parameters viz. energy of activation, frequency factor, entropy of activation, etc. have been evaluated using Coats-Redfern equation. [ABSTRACT FROM AUTHOR]