Volume No. :   2

Issue No. :  2

Year :  2010

ISSN Print :  0975-4393

ISSN Online :  2349-2988


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Thermodynamic Parameters and Stability Constants of Chromium (III) Complexes of Carbohydrazone and Thiocarbohydrazone



Address:   Archana Singh1*, P.Singh2 and K.B.S.Chauhan2
1Department of Chemistry, S.V.College, Bairagarh-462030, India
2Chemical Laboratories, S.S.V.(PG)College, Hapur-245101, India
*Corresponding Author:
DOI No:

ABSTRACT:
Stability constants of two ligands, derived from 4- methyl -7- hydroxy – 8- acetyl coumarin with carbohydrazide and thiocarbohydrazide and formation constants of their Chromium (III) complexes have been determined pH metrically at two different temperatures using Calvin and Melchior’s extension of Bjerrum’s method. The stability constants decrease with the increase in temperature. The thermodynamic parameters ?G, ?H and ?S have been calculated. The values of ?G and ?H have been found to be negative and ?S values are positive for both complexes.
KEYWORDS:
Stability constant, enthalpy, MHACC, MHACTC
Cite:
Archana Singh, P.Singh, K.B.S.Chauhan. Thermodynamic Parameters and Stability Constants of Chromium (III) Complexes of Carbohydrazone and Thiocarbohydrazone. Research J. Science and Tech. 2010; 2(2): 29-30 .
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