Synthesis and mesomorphism of related series of triphilic ionic liquid crystals based on 1,2,4-triazolium cations

TY - JOUR

T1 - Synthesis and mesomorphism of related series of triphilic ionic liquid crystals based on 1,2,4-triazolium cations

AU - Riccobono, Alessio

AU - Lazzara, Giuseppe

AU - Rogers, Sarah E.

AU - Pibiri, Ivana

AU - Pace, Andrea

AU - Slattery, John M.

AU - Bruce, Duncan W.

N1 - © 2020 Elsevier B.V. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

PY - 2021/1/1

Y1 - 2021/1/1

N2 - The synthesis, liquid crystal and conductivity properties of a series of 27 salts based on the 5-(4-(alkyloxy)phenyl)-1,2,4-triazol-4-ium cation bearing a perfluoroalkyl chain with triflate, tetrafluoroborate and bistriflimide anion are reported. The cations are regarded as triphilic on account of their three distinct regions – hydrocarbon, fluorocarbon and ionic. The mesophases were characterised by a combination of polarised optical microscopy, calorimetry and small-angle scattering experiments using both X-rays and neutrons, while thermal stability was probed using thermogravimetric analysis. The liquid crystal properties are found to be dependent on the anion and the length of the perfluorocarbon chain, which effects combine to determine aspects of the self-organisation in the mesophases. A strong dependence of conductivity on the anion is seen, which is in turn related to its charge density.

AB - The synthesis, liquid crystal and conductivity properties of a series of 27 salts based on the 5-(4-(alkyloxy)phenyl)-1,2,4-triazol-4-ium cation bearing a perfluoroalkyl chain with triflate, tetrafluoroborate and bistriflimide anion are reported. The cations are regarded as triphilic on account of their three distinct regions – hydrocarbon, fluorocarbon and ionic. The mesophases were characterised by a combination of polarised optical microscopy, calorimetry and small-angle scattering experiments using both X-rays and neutrons, while thermal stability was probed using thermogravimetric analysis. The liquid crystal properties are found to be dependent on the anion and the length of the perfluorocarbon chain, which effects combine to determine aspects of the self-organisation in the mesophases. A strong dependence of conductivity on the anion is seen, which is in turn related to its charge density.

KW - Impedance spectroscopy

KW - Ionic liquid crystal

KW - SANS

KW - SAXS

KW - Triphilic

UR - http://www.scopus.com/inward/record.url?scp=85097048376&partnerID=8YFLogxK

U2 - 10.1016/j.molliq.2020.114758

DO - 10.1016/j.molliq.2020.114758

M3 - Article

AN - SCOPUS:85097048376

SN - 0167-7322

VL - 321

JO - JOURNAL OF MOLECULAR LIQUIDS

JF - JOURNAL OF MOLECULAR LIQUIDS

M1 - 114758

ER -