Abstract
Organomercury(II) derivatives of kojic acid and maltol of the type RHgL1(I) and RHgL2(II) (R=phenyl(C6H5), p-hydroxyphenyl (p-HOC6H4), p-acetoxyphenyl (p-AcOC6H4); HL1=kojic acid, HL2=maltol) have been synthesised. IR spectral studies indicate that both the ligands act as bidentate groups, bonding to the mercury(II) ion through phenolic and carbonyl oxygens. From thermogravimetric curves, the order, activation energy and apparent activation entropy of the thermal decomposition reaction have been elucidated. The variation of the activation energy has been correlated with the nature of the substituents on the phenyl ring. The heat of reaction has been determined from differential scanning calorimetric studies. The fragmentation pattern has been analysed on the basis of mass spectra.
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