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Probing Solute-Solvent Interaction in 1-ethyl-3-methylimidazolium-based Room Temperature Ionic Liquids: A Time-Resolved Fluorescence Anisotropy Study

Probing Solute-Solvent Interaction in 1-ethyl-3-methylimidazolium-based Room Temperature Ionic Liquids: A Time-Resolved Fluorescence Anisotropy Study

Sudhir Kumar Das, Moloy Sarkar

J Fluoresc. 2014 Mar;24(2):455-63.

PMID: 24158315

Abstract:

Rotational diffusion of two organic solutes, coumarin153 (C153) and 4-aminophthalimide (AP) has been investigated in four ionic liquids (ILs), viz. 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMTFA), 1-ethyl-3-methylimidazolium ethylsulfate (EMIMESU), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMTFB) and 1-ethyl-3-methylimidazolium tetracyanoborate (EMIMTCB), as a function of temperature. Between the two probes, AP can act as hydrogen-bond-donor to the solvents having hydrogen bond acceptor ability. The results indicate that the rotational dynamics of C153 is mainly governed by the viscosity of the medium. On the other hand, the rotational motion of AP is found to be significantly hindered in the ILs depending on the nature of anions of the ILs. Rotational coupling constant values for AP in the ILs follow the order TFA > ESU > TCB > TFB. The slower rotational motion of AP in these ILs has been attributed to the specific hydrogen bonding interaction between AP and anions of ILs.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP143314163	1-Ethyl-3-methylimidazolium tetrafluoroborate		143314-16-3	Price

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