Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   DECEMBER 2010 , Volume 7 , Number 4; Page(s) 846 To 852.
 
Paper: 

THERMOKINETIC STUDIES OF ORGANOTIN(IV) CARBOXYLATES DERIVED FROM PARA-METHOXYPHENYLETHANOIC ACID

 
 
Author(s):  DANISH M.*, AHMAD NIAZ, ZAHARA N., ALI S., MUHAMMAD N.
 
* DEPARTMENT OF CHEMISTRY, UNIVERSITY OF SARGODHA, SARGODHA-40100, PAKISTAN
 
Abstract: 

Thremogravimetric (TG) studies of a new series of organotin (IV) carboxylates of the general formula RnSnL4-n (where R=CH3, C2H5, C4H9, C6H5, C6H11 and C8H17, n=2, 3 and L=para -methoxyphenylethanoate anion) have been carried out. Horowitz and Metzger method has been used to calculate thermokinetic parameters. It has been found that diorganotin dicarboxylates have larger activation energy than those of corresponding triorganotin carboxylates. Furthermore, the activation energy, Gibb’s free energy, entropy and enthalpy of diorganotin compounds shows the following trend, (CH3) 2SnL2 < (C2H5) 2SnL2 < (C4H9) 2SnL2 < (C8H17) 2SnL2. This is attributed to steady increase in chain length of the alkyl groups. However, triorganotin compounds do not show such behavior.

 
Keyword(s): THREMOGRAVIMETRY, ORGANOTIN(IV) CARBOXYLATES, THERMOKINETIC PARAMETERS, ACTIVATION ENERGY
 
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