Chemical Speciation Studies on Complexation of Ditopic Ligands: Interaction of Adipic Acid Dihydrazide with Pb2+, Hg2+ and Cd2+ Metal Ions in Aqueous Medium
Uma Rani Bhagavatula
Department of Physical and Nuclear Chemistry and Chemical Oceanography, School of Chemistry, Andhra University, Visakhapatnam -530003, India
Shyamala Pulipaka
Department of Physical and Nuclear Chemistry and Chemical Oceanography, School of Chemistry, Andhra University, Visakhapatnam -530003, India
Satyanarayana Atreyapurapu *
Department of Physical and Nuclear Chemistry and Chemical Oceanography, School of Chemistry, Andhra University, Visakhapatnam -530003, India
*Author to whom correspondence should be addressed.
Abstract
Chemical modelling study of the ligational behaviour of adipic acid dihydrazide (AADH) towards the toxic metal ions Pb2+, Hg2+ and Cd2+ has been carried out potentiometrically in aqueous medium. AADH possesses two coordinating units on either side of the molecule making it a ditopic ligand. Speciation analysis of the metal ion-AADH systems of different molar ratios using the Miniquad-75 program indicated the formation of mono and binuclear species in different states of protonation.
Keywords: Speciation, ditopic ligands, dihydrazides, adipic acid dihydrazide, complexes of Pb2 , Hg2 and Cd2