THANKAMONY et al.
Conclusions
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7
9
From the thermal decomposition studies of ISAT,
HAAT, HBAT and their lanthanum(III) chloride
complexes, it could be concluded that the nature of
decomposition and stability changes with the nature
of the ligand. All the complexes give a stable residue
1
1
1
0 G. N. Sasidharan, K. Mohanan and A. N. Lekshmiprabha,
Asian J. Chem., 14 (2002) 1545.
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8
8 (1966) 4150.
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of La O around 600°C. The initial decomposition
2 3
temperature is frequently used to define the relative
stabilities of metal complexes [27]. On the basis of
this, the relative thermal stabilities of the ligands can
be represented as: HBAT>ISAT>HAAT. However,
the stabilities of the complexes is in the order:
3
1
(
1
1
[
La(HAAT)Cl ]>[La(ISAT)Cl ]>[La(HBAT)Cl ].
3 3 3
1
1
1
1
Acknowledgements
9
8 M. F. Richardson, W. F. Wagner and D. E. Sands, Inorg.
Chem., 7 (1968) 2495.
We express our sincere thanks to Prof. Dr. P. Indrasenan,
Dean, Faculty of Science and Prof. Dr. K. N. Rajasekharan,
Head of the Department of Chemistry, University of Kerala,
Kariavattom Campus, Trivandrum, for providing me with nec-
essary facilities for carrying out this work successfully. Instru-
mental facilities provided by Sophisticated Analytical Instru-
ment Facility (SAIF), Cochin, IIT, Bombay and RRL,
Trivandrum are gratefully acknowledged. One of the authors
9 B. Singh and T. B. Singh, Indian J. Chem.,
131A (1999) 355.
2
2
0 R. Lyszczek, J. Therm. Anal. Cal., 90 (2007) 533.
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2
2
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(
MT) is grateful to the University Grants Commission, New
3 S. H. Patel, P. B. Pansuriya, M. R. Chhasatia,
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2
2
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2
4 K. K. Aravindakshan and K. Muraleedharan, Thermochim.
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Received: March 20, 2008
Accepted: June 3, 2008
OnlineFirst: November 12, 2008
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