Stability Constants of Some Univalent Cation Complexes of 2,3-Naphtho-15-crown-5 in Nitrobenzene Saturated with Water

• Published in: Journal of solution chemistry Vol. 38; no. 9; pp. 1129 - 1138
• Main Authors: MAKRLIK, E, VANURA, P, SELUCKY, P
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.09.2009; Springer
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Exact sciences and technology; General and physical chemistry; Geochemistry; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Oceanography; Physical Chemistry; Solutions; Water–nitrobenzene system; 2,3-Naphtho-15-crown-5; Extraction; Univalent cations; Stability constants; Water; Nitro compound; Stability; Cesium; Stability constant; Rubidium; Complexes; Equilibrium; Water-nitrobenzene system; Saturated solution; Sodium; Benzenic compound; Potassium; Univalent cautions
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-009-9434-z

The extraction of micro amounts of cesium by nitrobenzene solutions of sodium, potassium and rubidium dicarbollylcobaltates (M + B − ;M + =Na + ,K + ,Rb + ) has been investigated in the presence of 2,3-naphtho-15-crown-5 (N15C5, L). The equilibrium data were explained by assuming that ML + and ML 2 + complexes (M + =Na + ,K + ,Rb + , Cs + ; L=N15C5) were present in the organic phase. The stability constants of the complex species ML + and ML 2 + have been determined in nitrobenzene saturated with water. It was found that the stability of the complex cation ML + (where M + =Na + ,K + ,Rb + , Cs + ; L=N15C5) in water-saturated nitrobenzene solutions increases along the series Cs + <Rb + <K + <Na + , whereas that of the species ML 2 + in the same medium increases in the order Cs + <Rb + <Na + <K + .