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Structural and thermal analysis of bis-(5-sulphosalicylato)-diaquo complexes of VO(II), Cu(II), Ni(II), Co(II), Fe(II) and Mn(II)

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Abstract

The reactions of the 5-sulphosalicylate anion with VO(II), Cu(II), Ni(II), Co(II), Fe(II) and Mn(II) gave bis-(5-sulphosalicylato)-diaquo complexes. The structures of these complexes were predicted from elemental analyses and IR spectra. Their decompositions were studied by TG, DTG and DTA. Decomposition occurred in two steps: elimination of two water molecules, followed by decomposition of the dehydrated complex to give metal oxide as end-product. The thermal stability sequence for the complexes was

VO(II) > Cu(II) > Co(II) ≈ Ni(II) ≈ Fe(II) > Mn(II), which is in accordance with the covalency sequence for the M-O bond.

Zusammenfassung

Die Reaktionen des 5-Sulphosalicylat-Anions mit VO(II), Cu(II), Ni(II), Co(II), Fe(II) und Mn(II) ergaben Bis-(5-sulphosalicylato)-diaquo-Komplexe. Die Strukturen dieser Komplexe wurden durch Elementaranalyse und IR-Spektren bestätigt. Die Zersetzung der Komplexe wurde mittels TG, DTG und DTA untersucht. Die Zersetzung verläuft in zwei Schritten: Eliminierung der zwei Wassermoleküle, gefolgt von der das Metalloxid als Endprodukt ergebenden Zersetzung des dehydratisierten Komplexes. Die Thermische Stabilität der Komplexe nimmt in der Reihenfolge VO(II) > Cu(II) > Co(II) ≈ Ni(II) ≈ Fe(II) > Mn(II) ab, womit die gleiche Reihenfolge wie für die Kovalenz der M-O-Bindung festgestellt wurde.

Резюме

Реакции 5-сульфосалиц илат-иона с двухвалентными вана дил, медь, никель, кобальт, железо и марг анец приводили к обра зованию бис-(5-сульфосалицилат о)-диакво комплексов. На основе элементного анализа и ИК спектров установлен а структура комплексов. Разложен ие комплексов было из учено методами ТГ, ДТГ и ДТА: о но протекает в две стади и: выделение двух моле кул воды и последующее разложе ние безводного комплекса с образова нием окиси металла в к ачестве конечного продукта. Т ермическая устойчивость компле ксов располагается в ряд VO > Сu > Со ≈ Ni ≈ Fe > Мn, что согласуется с послед овательностью ковал ентности связи М-О.

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Authors and Affiliations

  1. Department of Chemistry, Indore University, Khanmdawa Road, 452001, Indore, India

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

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

The authors are sincerely grateful to the late Dr. M. D. Karkhanawala (then Head, Chemistry Division, BARC, India) for providing facilities, and to the U. G. C. (India) for research fellowships to the authors (BDH and SMA).

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Khadikar, P.V., Ali, S.M. & Heda, B. Structural and thermal analysis of bis-(5-sulphosalicylato)-diaquo complexes of VO(II), Cu(II), Ni(II), Co(II), Fe(II) and Mn(II). Journal of Thermal Analysis 30, 305–317 (1985). https://doi.org/10.1007/BF02156496

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  • DOI: https://doi.org/10.1007/BF02156496

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