Authors:
L. S. PrabhumirashiChemistry Department Poona University 411 007 Pune India

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G. N. NatuChemistry Department Poona University 411 007 Pune India

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J. K. KhojeChemistry Department Poona University 411 007 Pune India

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Thermogravimetric analysis of solid state bis-Cu(II) amine complexes CuL2X2, whereX=Cl or NO3 andL=ethylenediamine (en), tetramethylethylenediamine (tmn),o-phenylenediamine (opd) and 2,2′ bipyridyl (bpy), has been carried out and the kinetic parameters have been determined by fitting the observed mass losses corresponding to various steps using the Coats and Redfern equation. These studies show that the activation energies of these complexes decrease on changing the ligand in the order: bpy > opd > en > tmn. This trend can be attributed to the rigidity of the N-C-C-N skeleton in the bpy and opd ligands and steric crowding at the nitrogens in the tmn ligand. The majority of the decomposition steps were found to be composite in nature and frequently involved fractional groups expelled from the complexes. From the observation ofEa>Δ H, the thermal decomposition process of these complexes appears to be governed by the “nucleation and growth” mechanism.

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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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Geopolymers

Inorganic polymeric new materials

Author:
J. Davidovits