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Kinetics of thermal dehydration of some bis-salicylato-diaquo complexes of transition metal ions

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Abstract

The kinetics of thermal dehydration of bis-salicylato-diaquo complexes of VO(II), Cu(II), Ni(II), Co(II), Fe(II), Mn(II) and Zn(II) were studied. The activation energies and other kinetic parameters were evaluated. The observed kinetic parameters indicate first-order reactions. The activation energy of the thermal dehydration decreases in the sequence VO(II) > Cu(II) > Zn(II) > Co(II) > Ni(II) > Fe(II) > Mn(II), which is also the sequence for the difference in carboxyl group IR frequency.

Zusammenfassung

Die Kinetik der thermischen Dehydratisierung von Bis-salicylato-diaquo-Komplexen von VO(II), Cu(II), Ni(II), Co(II), Fe(II), Mn(II) und Zn(II) wurden untersucht. Aktivierungsenergien und andere kinetische Parameter wurden bestimmt. Die beobachteten kinetischen Parameter weisen auf Reaktionen erster Ordnung hin. Die Aktivierungsenergie der thermischen Dehydratisierung nimmt in der Reihenfolge VO(II) > Cu(II) > Zn(II) > Co(II) > Ni(II) > > Fe(II) > Mn(II) ab. In der gleichen Reihenfolge ändert sich auch die IR-Frequenz der Carbonylgruppe.

Резюме

Изучена кинетика реа кций термической дегидратации диакво-бис-салицилатных комплексов двухвале нтных ванадила, меди, н икеля, кобальта, железа, марг анца и цинка. Оценены энергии акти вации и некоторые дру гие кинетические параме тры, свидетельствующ ие о реакциях первого по рядка. Энергия активации процесса т ермической дегидратации уменьш ается в ряду VO(II) > Cu(II) > Zn(II) > Co(II) > Ni(II) > Fe(II) > Mn(II). Эта же последователь ность коррелируется с наблюдаемым различи ем частот колебаний карбонильной группы в ИК спектрах.

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Authors and Affiliations

  1. Department of Chemistry, Indore University, Khandawa Road, 452 001, Indore, India

    P. V. Khadikar, S. M. Ali & B. D. Heda

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  1. P. V. Khadikar
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  2. S. M. Ali
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  3. B. D. Heda
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Additional information

The authors express their sincere thanks to the late Dr. M. D. Karkhanawala (then Head, Chemistry Division, BARE, India), for providing the facilities for TG and DTA, and also to the UGC (India) for research fellowships to the authors (BDH and SMA).

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Khadikar, P.V., Ali, S.M. & Heda, B.D. Kinetics of thermal dehydration of some bis-salicylato-diaquo complexes of transition metal ions. Journal of Thermal Analysis 30, 167–176 (1985). https://doi.org/10.1007/BF02128127

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