Complexant efficiency of 2'-hydroxy-4-R-chalcones for Aluminium (III) and substituent's effect.
The complexant efficiency with aluminium of 2'-hydroxy-4-R-chalcones, which depends on the nature and positions of the substituent was studied by a spectrophotometric method. The apparent formation constant was determined. The quantitative analysis of the substituent's influence on the complexation reaction equilibrium was made using the Hammett relation. The constant sigma magnitudes of groups OH, OCH(3), Cl and F in the 4-position agree with values reported in the literature.
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Department of Chemistry, San Luis National University, Chacabuco 917, 5700 San Luis, Argentina.
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