Chemical speciation of binary complexes of Co(II), Ni(II) and Cu(II) with 5-Sulfosalicylic acid in urea-water mixtures

• Main Authors: Rao, G. Nageswara, Balakrishna, M., Rao, G. Srinivasa, Ramanaiah, M., Ramaraju, Bendi
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2019
• Subjects: 5-Sulfo Salicylic Acid; Engineering::Materials; Speciation
• Online Access: https://hdl.handle.net/10356/85178; http://hdl.handle.net/10220/50117; https://www.derpharmachemica.com/pharma-chemica/chemical-speciation-of-binary-complexes-of-coii-niii-and-cuii-with-5-sulfosalicylic-acid-in-ureawater-mixtures.pdf
• Institution: Nanyang Technological University

Speciation of Co(II), Ni(II) and Cu(II) complexes with 5-Sulfosalicylic acid (5-SSA) in the presence of urea-water mixtures at an ionic strength of 0.16 mol dm-3 and temperature 303 K were investigated pH metrically. The existence of different binary complex species was established from modeling studies using the computer program MINIQUAD75. The increased stability of the complexes with increasing urea was explained by electrostatic forces. The influence of the urea on the chemical speciation is discussed based on the dielectric constant of the medium. Distribution diagrams of various species of the complexes in relation to pH are presented.