Issue 26, 2010

Optical basicity of ionic liquids

Abstract

The concept of optical basicities initially developed by Duffy for solid oxides was successfully transferred to low melting salts such as ionic liquids (ILs). Several ionic liquids (ILs) were doped with Mn(NTf2)2 (NTf2 = bis(trifluoromethanesulfonyl)imide) as a probe to investigate the IL anion basicity by means of UV-Vis spectroscopy. The 6A14A, 4E(G) transition band of Mn2+ is influenced by the electron donor properties, i.e., Lewis basicity, of the coordinating ligands but remains—to the first order—independent from the ligand field. The change in the optical spectra for various Mn(NTf2)2 doped ILs is predominantly dependent on the anion. No significant influence of the IL cation could be detected for the ILs under investigation except for functionalized cations with electron donor functionalities. This allows ranking the ILs with respect to their (optical) anion basicities. For the most prominent IL anions an order of BF4 < ClO4 < NTf2 ∼ MeSO3 < NO3 < DCA < TFA < EtSO4 ∼ OTos < Cl < Br with respect to rising optical basicity could be established.

Graphical abstract: Optical basicity of ionic liquids

Supplementary files

Article information

Article type
Paper
Submitted
04 Dec 2009
Accepted
08 Apr 2010
First published
18 May 2010

Phys. Chem. Chem. Phys., 2010,12, 7056-7063

Optical basicity of ionic liquids

S. Pitula and A. Mudring, Phys. Chem. Chem. Phys., 2010, 12, 7056 DOI: 10.1039/B925606G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements