The Local Structure of Ionic Liquids: Cation–Cation NOE Interactions and Internuclear Distances in Neat [BMIM][BF4] and [BDMIM][BF4]

Authors

  • Andrea Mele Prof.,

    1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy, Fax: (+39) 022-399-3080
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  • Greta Romanò,

    1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy, Fax: (+39) 022-399-3080
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  • Matteo Giannone,

    1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy, Fax: (+39) 022-399-3080
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  • Enzio Ragg Prof.,

    1. Dipartimento di Scienze Molecolari Agroalimentari, Università di Milano, Via Celoria, 2, 20133 Milano, Italy
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  • Giovanni Fronza Prof.,

    1. CNR—Istituto di Chimica del Riconoscimento Molecolare, Via L. Mancinelli, 7, 20131 Milano, Italy
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  • Guido Raos Dr.,

    1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy, Fax: (+39) 022-399-3080
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  • Valentina Marcon

    1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy, Fax: (+39) 022-399-3080
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  • We thank Dr. Luciana Malpezzi (Politecnico di Milano) for helpful discussions, Prof. Chieu D. Tran (Marquette University, Milwaukee (USA)) for a generous gift of ionic liquids, and Mr. Walter Panzeri (CNR-ICRM) for technical assistance. BMIM=1-butyl-3-methyl imidazolium, BDMIM=1-butyl-2,3-dimethylimidazolium.

Abstract

original image

The polar domains within model ionic liquids are assessed by intermolecular NOE interaction studies. The cation–cation distances in pure ionic liquids 1-butyl-3-methylimidazolium (see picture) and 1-butyl-2,3-dimethylimidazolium tetrafluoroborate are obtained and used to provide models of the local structure of the liquids.

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