PGSE diffusion, 19F, 1H HOESY and 13C NMR studies for a series of [Ru(Cp*)(eta6-arene)][PF6] (1) salts are presented. The solid-state structure of [Ru(Cp*)(eta6-fluorobenzene)][PF6] (1 c) is reported. The extent of the ion pairing and the relative positions of the ions are shown to depend on the arene. For the solvent dichloromethane, new and literature PGSE data for PF6(-) salts of transition-metal, inorganic, and organic salts are compared. Taken together, these new results show that the charge distribution and the ability of the anion to approach the positively charged positions (steric effects due to molecular shape) are the determining factors in deciding the amount of ion pairing. DFT calculations of the charges in four salts of type 1, as well as in a variety of other salts, using a natural population analysis (NPA), support this view. This represents the first attempt, using experimental data, to understand, correlate, and partially explain the various degrees of ion pairing in a widely different collection of salts.

PGSE NMR diffusion Overhauser studies on [Ru(Cp*)(eta(6)-arene)][PF6], plus a variety of transition-metal, inorganic, and organic salts: An overview of ion pairing in dichloromethane / A. Moreno, P.S. Pregosin, L.F. Veiros, A. Albinati, S. Rizzato. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 14:18(2008), pp. 5617-5629. [10.1002/chem.200800222]

PGSE NMR diffusion Overhauser studies on [Ru(Cp*)(eta(6)-arene)][PF6], plus a variety of transition-metal, inorganic, and organic salts: An overview of ion pairing in dichloromethane

A. Albinati
Penultimo
;
S. Rizzato
Ultimo
2008

Abstract

PGSE diffusion, 19F, 1H HOESY and 13C NMR studies for a series of [Ru(Cp*)(eta6-arene)][PF6] (1) salts are presented. The solid-state structure of [Ru(Cp*)(eta6-fluorobenzene)][PF6] (1 c) is reported. The extent of the ion pairing and the relative positions of the ions are shown to depend on the arene. For the solvent dichloromethane, new and literature PGSE data for PF6(-) salts of transition-metal, inorganic, and organic salts are compared. Taken together, these new results show that the charge distribution and the ability of the anion to approach the positively charged positions (steric effects due to molecular shape) are the determining factors in deciding the amount of ion pairing. DFT calculations of the charges in four salts of type 1, as well as in a variety of other salts, using a natural population analysis (NPA), support this view. This represents the first attempt, using experimental data, to understand, correlate, and partially explain the various degrees of ion pairing in a widely different collection of salts.
anions; cations; density functional calculations; ion pairs; NMR spectroscopy
Settore CHIM/03 - Chimica Generale e Inorganica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/60791
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