The EPR spectra of the anion radicals of nitrobenzene isomers in aprotic solvents with added sodium tetraphenylborate show an intermolecular cation-exchange reaction in which the incoming cation goes to the uncomplexed nitro group. The activation energy barriers ΔH‡ are almost the same for the m and p isomers, while the activation free energy ΔG‡ is dependent on the relative position of the two nitro groups, probably due to different solvation effects. The transport properties of the systems were also investigated. The spin distribution was computed by the McLachlan method, modified according to McClelland, both for the ion pairs and for the triple ions which are the intermediates of the intermolecular cation exchange.

Influence of the Relative Position of Nitro Group on Intermolecular Sodium Exchange Process in Dinitrobenzene Ion Pairs, Investigated by EPR / M. Branca, A. Gamba, C. Oliva. - In: JOURNAL OF MAGNETIC RESONANCE. - ISSN 0022-2364. - 54:2(1983), pp. 216-225.

Influence of the Relative Position of Nitro Group on Intermolecular Sodium Exchange Process in Dinitrobenzene Ion Pairs, Investigated by EPR

C. Oliva
Ultimo
1983

Abstract

The EPR spectra of the anion radicals of nitrobenzene isomers in aprotic solvents with added sodium tetraphenylborate show an intermolecular cation-exchange reaction in which the incoming cation goes to the uncomplexed nitro group. The activation energy barriers ΔH‡ are almost the same for the m and p isomers, while the activation free energy ΔG‡ is dependent on the relative position of the two nitro groups, probably due to different solvation effects. The transport properties of the systems were also investigated. The spin distribution was computed by the McLachlan method, modified according to McClelland, both for the ion pairs and for the triple ions which are the intermediates of the intermolecular cation exchange.
Settore CHIM/02 - Chimica Fisica
1983
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/189537
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