The association and complexation equilibria in the system D-glucitol-nickel(II)-water

A joint study using polarimetry, spectrophotometry, and mathematical modeling revealed the formation of 1: 1, 2: 1, and 4: 4 outer-sphere complexes of nickel(II) ions with neutral D-glucitol (H 6Glc-ol), viz., {[Ni(H 2O) n]•(H 6Glc-ol)aq} 2+, {[Ni(H 2O) n] 2•(H 6Glc-ol)aq} 4+, and {[Ni(H 2O) n] 4•[(H 6Glc-ol)aq] 4} 8+ in a weakly acidic medium. In aqueous solutions, D-glucitol forms tetramers. For each form, the constant of formation and the specific optical rotation was calculated. © 2010 Springer Science+Business Media, Inc