TY - JOUR

T1 - Strange behaviour of transport properties in novel metal thiocyanate based ionic liquids

AU - Cabeza, Oscar

AU - Segade, Luisa

AU - Domínguez-Pérez, Montserrat

AU - Rilo, Esther

AU - Ausín, David

AU - Seijas, Julio A.

AU - Vazquez-Tato, M. Pilar

AU - Матвеев, Владимир Викторович

AU - Ievlev, Alexandr

AU - Salgado, Josefa

AU - Varela, Luis M.

N1 - Publisher Copyright: © 2021 The Author(s)

PY - 2021/10/15

Y1 - 2021/10/15

N2 - In a previous paper some of us presented the structure and some properties of a new family of ionic liquids, ILs, with a common cation, 1-butyl-3-methyl imidazolium (the popular [C4C1Im]+ or [BMIM]+) and a variety of anions based in thiocyanate (SCN)−: one reference sample and ten with anionic metal complexes of different valences: AlIII, MnII, FeIII, CrIII, NiII, HgII, ZnII, CoII and CuI, resulting, respectively, [BMIM](SCN), [BMIM]3 Al(SCN)6, [BMIM]4 Mn(SCN)6, [BMIM]3 Fe(SCN)6, [BMIM]3 Cr(SCN)6, [BMIM]4 Ni(SCN)6, [BMIM]2 Hg(SCN)4, [BMIM]2 Zn(SCN)4, [BMIM]2 Co(SCN)4 and [BMIM]3 Cu(SCN)4. In this paper we show experimental measurements of electrical conductivity of these ILs in a broad temperature range (about 90 K). Viscosity has been measured for six compounds in a wide temperature range. In addition, the diffusion coefficient for both ions forming the IL has been measured for some of the samples using NMR-Dosy technique. In spite of being very similar compounds from a chemical point of view, they present very different transport property values. Thus, viscosity varies more than two orders of magnitude among those metal thiocyanate ILs, being the highest for the compound with Al and the lowest for that with Hg. Moreover, differences between ionic conductivity and diffusion coefficient values extend more than one order of magnitude among the thiocyanate ILs. These three properties will be related in pairs, thus through Walden's rule we compare molar conductivity and fluidity, while using Kohlrausch's law and Nerst-Einstein equation molar conductivity and diffusion coefficient are related. Also, diffusion coefficient and fluidity (the inverse of viscosity) are compared by means of Stokes-Einstein relationship. In addition, we calculate the Laity interionic friction coefficients for both anions of the IL with Hg. Finally, a theoretical model is suggested to explain all the experimental evidences reported.

AB - In a previous paper some of us presented the structure and some properties of a new family of ionic liquids, ILs, with a common cation, 1-butyl-3-methyl imidazolium (the popular [C4C1Im]+ or [BMIM]+) and a variety of anions based in thiocyanate (SCN)−: one reference sample and ten with anionic metal complexes of different valences: AlIII, MnII, FeIII, CrIII, NiII, HgII, ZnII, CoII and CuI, resulting, respectively, [BMIM](SCN), [BMIM]3 Al(SCN)6, [BMIM]4 Mn(SCN)6, [BMIM]3 Fe(SCN)6, [BMIM]3 Cr(SCN)6, [BMIM]4 Ni(SCN)6, [BMIM]2 Hg(SCN)4, [BMIM]2 Zn(SCN)4, [BMIM]2 Co(SCN)4 and [BMIM]3 Cu(SCN)4. In this paper we show experimental measurements of electrical conductivity of these ILs in a broad temperature range (about 90 K). Viscosity has been measured for six compounds in a wide temperature range. In addition, the diffusion coefficient for both ions forming the IL has been measured for some of the samples using NMR-Dosy technique. In spite of being very similar compounds from a chemical point of view, they present very different transport property values. Thus, viscosity varies more than two orders of magnitude among those metal thiocyanate ILs, being the highest for the compound with Al and the lowest for that with Hg. Moreover, differences between ionic conductivity and diffusion coefficient values extend more than one order of magnitude among the thiocyanate ILs. These three properties will be related in pairs, thus through Walden's rule we compare molar conductivity and fluidity, while using Kohlrausch's law and Nerst-Einstein equation molar conductivity and diffusion coefficient are related. Also, diffusion coefficient and fluidity (the inverse of viscosity) are compared by means of Stokes-Einstein relationship. In addition, we calculate the Laity interionic friction coefficients for both anions of the IL with Hg. Finally, a theoretical model is suggested to explain all the experimental evidences reported.

KW - Diffusion coefficient

KW - Ionic conductivity

KW - Thiocyanate ionic liquids

KW - Viscosity

KW - PHYSICAL-PROPERTIES

KW - TEMPERATURE-DEPENDENCE

KW - THERMOPHYSICAL PROPERTIES

KW - PRESSURE-DEPENDENCE

KW - ELECTRICAL-CONDUCTIVITY

KW - NEGATIVE THERMAL-EXPANSION

KW - VISCOSITY

KW - DENSITY

KW - BINARY-MIXTURES

KW - COEFFICIENTS

UR - http://www.scopus.com/inward/record.url?scp=85111986351&partnerID=8YFLogxK

U2 - 10.1016/j.molliq.2021.117164

DO - 10.1016/j.molliq.2021.117164

M3 - Article

AN - SCOPUS:85111986351

VL - 340

JO - Journal of Molecular Liquids

JF - Journal of Molecular Liquids

SN - 0167-7322

M1 - 117164

ER -