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Surface active and aggregation behavior of methylimidazolium-based ionic liquids of type [C n mim] [X], n = 4, 6, 8 and [X] = Cl−, Br−, and I− in water

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Abstract

The surface active and aggregation behavior of ionic liquids of type [C n mim][X] (1-alkyl-3-methylimidazolium (mim) halides), where n = 4, 6, 8 and [X] = Cl−, Br− and I− was investigated by using three techniques: surface tension, 1H nuclear magnetic resonance (NMR) spectroscopy, small-angle neutron scattering (SANS). A series of parameters including critical aggregation concentrations (CAC), surface active parameters and thermodynamic parameters of aggregation were calculated. The 1H NMR chemical shifts and SANS measurements reveal no evidence of aggregates for the short-chain 1-butylmim halides in water and however small oblate ellipsoidal shaped aggregates are formed by ionic liquids with 1-hexyl and 1-octyl chains. Analysis of SANS data analysis at higher concentrations of [C8mim][Cl] showed that the microstructures consist of cubically packed molecules probably through π–π and hydrogen bond interactions.

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Acknowledgement

The authors thank UGC-DAE Consortium for Scientific Research, Mumbai Center for funding a Collaborative Research Scheme (CRS) under grant no. CSR/AO/MUM/CRS-M-127/08/448.

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Authors and Affiliations

  1. Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India

    Nilesh M. Vaghela & Nandhibatla V. Sastry

  2. Solid State Physics Division, Bhabha Atomic Research Center (BARC), Trombay, Mumbai, 400 085, India

    Vinod K. Aswal

Authors
  1. Nilesh M. Vaghela
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  2. Nandhibatla V. Sastry
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  3. Vinod K. Aswal
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Corresponding author

Correspondence to Nandhibatla V. Sastry.

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Table S1

Chemical shifts, δ obs (in ppm), for different protons (as per Scheme 1) of ionic liquids in aqueous solutions (PDF 20 kb).

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Vaghela, N.M., Sastry, N.V. & Aswal, V.K. Surface active and aggregation behavior of methylimidazolium-based ionic liquids of type [C n mim] [X], n = 4, 6, 8 and [X] = Cl−, Br−, and I− in water. Colloid Polym Sci 289, 309–322 (2011). https://doi.org/10.1007/s00396-010-2332-5

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