Hydrophobic and Ionic Exchange of Tris(2,2′-bipyridine)ruthenium(II) and Methyl Viologen in Nafion Solutions

Joseph Rabani; Masao Kaneko; Akira Kira

doi:10.1021/la00053a022

Hydrophobic and Ionic Exchange of Tris(2,2′-bipyridine)ruthenium(II) and Methyl Viologen in Nafion Solutions

Joseph Rabani, Masao Kaneko, Akira Kira

Institute of Chemistry

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Abstract

The present paper concerns the nature of the hydrophobic bindings of tris(2,2′-bipyridine)ruthenium-(II) (Ru(bpy)₃ ²⁺) and methyl viologen (MV²⁺) to Nafion. The investigations involved steady-state emission measurements of Ru(bpy)₃ ²⁺ in Nafion aqueous solutions and the effects of both quenchers and chemically inert ions. The exchange of MV²⁺ with Mg²⁺ and with Ru(bpy)₃ ²⁺ ions in the Nafion domain was studied at various solutes concentrations. The results show extraordinarily strong hydrophobic bindings of Ru-(bpy)₃ ²⁺ (ΔG° = −7.8 kcal/mol) and MV²⁺ (ΔG° = −4.7 kcal/mol) to the Nafion. However, no specific hydrophobic regions with well-defined boundaries seem to be involved.

Original language	English
Pages (from-to)	941-946
Number of pages	6
Journal	Langmuir
Volume	7
Issue number	5
DOIs	https://doi.org/10.1021/la00053a022
State	Published - 22 May 1991

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title = "Hydrophobic and Ionic Exchange of Tris(2,2′-bipyridine)ruthenium(II) and Methyl Viologen in Nafion Solutions",

abstract = "The present paper concerns the nature of the hydrophobic bindings of tris(2,2′-bipyridine)ruthenium-(II) (Ru(bpy)3 2+) and methyl viologen (MV2+) to Nafion. The investigations involved steady-state emission measurements of Ru(bpy)3 2+ in Nafion aqueous solutions and the effects of both quenchers and chemically inert ions. The exchange of MV2+ with Mg2+ and with Ru(bpy)3 2+ ions in the Nafion domain was studied at various solutes concentrations. The results show extraordinarily strong hydrophobic bindings of Ru-(bpy)3 2+ (ΔG° = −7.8 kcal/mol) and MV2+ (ΔG° = −4.7 kcal/mol) to the Nafion. However, no specific hydrophobic regions with well-defined boundaries seem to be involved.",

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AB - The present paper concerns the nature of the hydrophobic bindings of tris(2,2′-bipyridine)ruthenium-(II) (Ru(bpy)3 2+) and methyl viologen (MV2+) to Nafion. The investigations involved steady-state emission measurements of Ru(bpy)3 2+ in Nafion aqueous solutions and the effects of both quenchers and chemically inert ions. The exchange of MV2+ with Mg2+ and with Ru(bpy)3 2+ ions in the Nafion domain was studied at various solutes concentrations. The results show extraordinarily strong hydrophobic bindings of Ru-(bpy)3 2+ (ΔG° = −7.8 kcal/mol) and MV2+ (ΔG° = −4.7 kcal/mol) to the Nafion. However, no specific hydrophobic regions with well-defined boundaries seem to be involved.

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Hydrophobic and Ionic Exchange of Tris(2,2′-bipyridine)ruthenium(II) and Methyl Viologen in Nafion Solutions

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