Thermoanalytical investigations of niobium(V) complexes of 4-isopropylphenol |
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| Authors: | Neeraj Sharma Amit Pathania Mala Sharma |
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| Institution: | (1) Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla, 171005, India |
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| Abstract: | Thermal behaviour of newly synthesized niobium(V) aryloxides of composition NbCl5−n
(OC6H4CH(CH3)2-4)
n
] (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 NbCl4(OC6H4CH(CH3)2-4)] resulted in the formation of NbOCl3 as the ultimate decompositional product while all other complexes yielded Nb2O5 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. |
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