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Research Journal of Pharmacy and Technology
Year : 2017, Volume : 10, Issue : 11
First page : ( 3681) Last page : ( 3686)
Print ISSN : 0974-3618. Online ISSN : 0974-360X.
Article DOI : 10.5958/0974-360X.2017.00667.9

Speciation studies of ternary complexes of Co(II), Ni(II), and Cu(II) with 5-Sulfosalicylic acid and 5-Hydroxysalicylic acid in Urea-water mixtures

Balakrishna M.1,2,**, Rao G. Srinivasa2,*, Ramanaiah M.1, Rao G. Nageswara3, Ramaraju B.4

1Department of Chemistry, Aditya Institute of Technology and Management, Tekkali, A.P, India-532201

2Department of Chemistry, GITAM Institute of Science, GITAM University, Visakhapatnam, A.P., India-530045

3Professor, Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam, A.P, India-530003

4Head, Lab and R&D Department, Shan Poornam Metals Sdn Bhd, (485075-P), Plot 34 (No. 1479), Lorong Perusahaan Maju 6, Kawasan Perindustrian Perai, Fasa 4, 13600 Perai, Pulau Pinang, Malaysia

*Corresponding Author E-mail: srgolagani@yahoo.com

**E-mail: mallabalakrishna300@gmail.com

Online published on 26 March, 2018.

Abstract

Speciation of complexes of Co(II), Ni(II) and Cu(II) with 5-Sulfosalicylic acid as primary ligand (L) and 5-Hydroxysalicylic acid as secondary ligand (X) has been studied in various concentrations (0.0–42.47% w/v) of Urea-water mixtures at ionic strength of 0.16 mol L−1 and at a temperature of 303.0 K. All the titrations were carried out at different relative concentrations (M: L: X = 1.0: 2.5: 2.5; 1.0: 2.5: 5.0; 1.0: 5.0: 2.5) of metal (M) to 5-Sulfosalicylic acid (L) and 5-Hydroxysalicylic acid (X) with NaOH as titrant. The species detected during the refinement were MLXH, ML2XH and MLX2H2 for Co(II), Ni(II) and Cu(II). The extra stability of ternary complexes compared to their binary complexes was understood to be due to electrostatic interactions of the side chains of ligands, charge neutralisation, chelate effect, stacking interactions and hydrogen bonding. The species distribution with pH at different compositions of Urea-water mixtures and plausible equilibria for the formation of species were also presented.

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Keywords

Speciation, 5-Sulfosalicylic acid, 5-Hydroxysalicylic acid, Urea and Ternary complexes.

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