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Volumetric and acoustic properties of a DBU (1,8-diazobicyclo[5.4.0]undec-7-ene) based protic ionic liquid in water at T = (293.15 to 328.15) K
Dharmendra Singh,
Published in Springer New York LLC
2015
Volume: 44

Issue: 3-4
Pages: 634 - 651
Abstract
Abstract The protic ionic liquid, 1,8-diazabicyclo[5.4.0]undec-7-en-8-ium trifluroacetate [DBUTFA], has been synthesized and densities of and speeds of sound in (DBUTFA + water) binary mixtures were measured simultaneously using a vibrating-tube digital density and speed of sound analyzer (Anton Paar, DSA 5000 M) at T (293.15 to 328.15) K, with 5 K interval, and at atmospheric pressure. From the experimental density and speed of sound data, apparent molar volumes, $$V-{\phi }$$ V ∅, and apparent molar isentropic compressibilities, $$K-{S,\phi }$$ K S, ∅, were determined and further analyzed using Redlich-Mayer type equations to evaluate the corresponding infinite dilution apparent molar volumes, $$V-{2}^{\infty }$$ V 2 ∞, infinite dilution apparent molar isentropic compressibilities, $$K-{S,2}^{\infty }$$ K S, 2 ∞, and empirical parameters (S V, B V, S k and B k ). The positive magnitude of the limiting volumetric slopes, S V versus m 1/2 for this protic ionic liquid (PIL) in aqueous solutions, suggests that PIL-water interactions are weak. © 2015 Springer Science+Business Media New York.