title: Linking Diffusion-Viscosity Decoupling and Jump Dynamics in a Hydroxyl-Functionalized Ionic Liquid: Realization of Microheterogeneous Nature of the Medium.
abstract: Analysis of time-resolved fluorescence anisotropy data in light of the Stokes-Einstein-Debye hydrodynamic description reveals significant decoupling of rotational motion of the solute and the viscosity of the medium for a hydroxyl-functionalized ionic liquid (IL). This behavior and NMR experiments indicate that the hydroxyl-functionalized IL is more heterogeneous than other structurally similar ILs. Considering that recent theoretical investigations have demonstrated that the jump dynamics and hydrogen-bond fluctuations are closely related in viscous media, in such a case the hydrodynamic description can provide inconsistent results, and the present inapplicability of the hydrodynamics description in explaining solute rotation in a viscous hydroxyl-functionalized IL perhaps provides experimental support to the role of orientational jumps and hydrogen bond formation in that event.
authors.affiliation: Department of Chemistry Raghunathpur College, Raghunathpur, Purulia, Pin-723133, India.
authors.forename: Sudhir Kumar
authors.initials: SK
authors.lastname: Das
authors.affiliation: School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, P.O. Jatni, Khurda, 752050, Odisha, India.
authors.forename: Debashis
authors.initials: D
authors.lastname: Majhi
authors.affiliation: School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, P.O. Jatni, Khurda, 752050, Odisha, India.
authors.forename: Prabhat Kumar
authors.initials: PK
authors.lastname: Sahu
authors.affiliation: School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, P.O. Jatni, Khurda, 752050, Odisha, India.
authors.forename: Moloy
authors.initials: M
authors.lastname: Sarkar
keywords: ionic liquids; microheterogeneous behavior; physicochemical properties; substituent effects; time-resolved spectroscopy