(Ion-solvent interactions in acetylacetone. VIII). Sodium ion-solvent complexing and ion transfer between solvents.

SAKAMOTO Ikko, OKAZAKI Satoshi

doi:10.2116/bunsekikagaku.39.6_333

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アセチルアセトン中のイオン‐溶媒間相互作用　（第８報）　ナトリウムイオン‐溶媒間錯生成反応とイオンの溶媒間移行
ナトリウムイオンヨウバイカンサクセイセイハンノウトイオンノヨウ
ナトリウムイオン-溶媒間錯生成反応とイオンの溶媒間移行 : アセチルアセトン中のイオン-溶媒間相互作用(第8報)
Ion-solvent interactions in acetylacetone VIII
アセチルアセトン中のイオン-溶媒間相互作用(第8報)

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Abstract

The complex formation constants of sodium ion in acetylacetone (2, 4-pentanedione, Hacac) with other solvents have been determined at 298 K by potentiometry using a sodium ion-sensitive glass electrode. The complexing solvents used were acetonitrile (AN), acetone (AC), water, methanol (MeOH), ethanol (EtOH), N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMA) and dimethyl sulfoxide (DMSO). The Gibbs free energies of transfer of sodium ion from Hacac to these solvents have also been determined assuming the liquid junction potential as negligible. The stability of sodium ion increases, in general, with solvent basicity in the following order: Hacac<AN, EtOH<AC, MeOH<water<DMF<DMA, DMSO. As for complex forming, only one solvent molecule of AN and MeOH solvated the sodium ion in Hacac. Mono- and di-solvated sodium ions were formed for AC, water and EtOH. Tri-solvated species were also detected for DMF, DMA and DMSO. In general, the degree of complexing of the sodium ion increases with solvent basicity. The quantitative correlation between the sodium ion-solvent complexing and the ion transfer is discussed on the basis of the coordination model of ionic solvation.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 39 (6), 333-340, 1990

The Japan Society for Analytical Chemistry

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