Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 45: Issue 3
Thermal dehydration and decomposition of M[M(C2O4)2]· x H2O ( x =3 for M =Sr(II) and x =6 for M =Hg(II))
Authors:
N. DebJ. B. College Department of Chemistry Jorhat 785 001 Assam India

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S. BaruahRegional Research Laboratory Jorhat 785 006 Assam India

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N. DassDibrugarh University Department of Chemistry Dibrugarh 786 004 Assam India

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Pages:
457–469
Online Publication Date:
09 Jan 2007
Publication Date:
01 Sep 1995
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02548778
Keywords:
activation energy; complexes; kinetics; oxalato complexes; thermal decomposition
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Abstract  

Strontium(II) bis (oxalato) strontium(II) trihydrate, Sr[Sr(C2O4)2]·3H2O and mercury(II) bis (oxalato) mercurate(II) hexahydrate, Hg[Hg(C2O4)2]·6H2O have been synthesized and characterized by elemental analysis, reflectance and IR spectral studies. Thermal decomposition studies (TG, DTG and DTA) in air showed SrCO3 was formed at ca. 500°C through the formation of transient intermediate of a mixture of SrCO3 and SrC2O4 around 455°C. Sharp phase transition from γ-SrCO3 to β-SrCO3 indicated by a distinct endothermic peak at 900°C in DTA. Mercury(II) bis (oxalato) mercurate(II) hexahydrate showed an inclined slope followed by surprisingly steep slope in TG at 178°C and finally 98.66% of weight loss at 300°C. The activation energies (E*) of the dehydration and decomposition steps have been calculated by Freeman and Carroll and Flynn and Wall's method and compared with the values found by DSC in nitrogen. A tentative reaction mechanism for the thermal decomposition of Sr[Sr(C2O4)2]·3H2O has been proposed.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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