scholarly journals From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

10.3791/55636 ◽  
2018 ◽  
Author(s):  
Gabriella Cavallo ◽  
Duncan W. Bruce ◽  
Giancarlo Terraneo ◽  
Giuseppe Resnati ◽  
Pierangelo Metrangolo
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Halogen Bonding ◽  
Materials Engineering ◽  
Ionic Liquid Crystals

Photoresponsive ionic liquid crystals assembled via halogen bond: en route towards light-controllable ion transporters

2017 ◽  
Vol 203 ◽  
pp. 407-422 ◽  
Author(s):  
Marco Saccone ◽  
Francisco Fernandez Palacio ◽  
Gabriella Cavallo ◽  
Valentina Dichiarante ◽  
Matti Virkki ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Liquid Crystals ◽  
Uv Light ◽  
Halogen Bond ◽  
Halogen Bonding ◽  
Supramolecular Complexes ◽  
Isotropic Phase ◽  
Ionic Liquid Crystals ◽  
Azobenzene Derivatives

We demonstrate that halogen bonding (XB) can offer a novel approach for the construction of photoresponsive ionic liquid crystals. In particular, we assembled two new supramolecular complexes based on 1-ethyl-3-methylimidazolium iodides and azobenzene derivatives containing an iodotetrafluoro-benzene ring as XB donor, where the iodide anion acted as an XB acceptor. DSC and X-ray diffraction analyses revealed that the preferred stoichiometry between the XB donors and acceptors is 2 : 1, and that the iodide anions act as bidentate XB-acceptors, binding two azobenzene derivatives. Due to the high directionality of the XB, calamitic superanions are obtained, while the segregation occurring between the charged and uncharged parts of the molecules gives rise to a layered structure in the crystal lattice. Despite the fact that the starting materials are non-mesomorphic, the halogen-bonded supramolecular complexes exhibited monotropic lamellar liquid-crystalline phases over broad temperature ranges, as confirmed with polarized optical microscopy. Due to the presence of the azobenzene moieties, the LCs were photoresponsive, and a LC-to-isotropic phase transition could be obtained by irradiation with UV light. We envisage that the light-induced phase transition, in combination with the ionic nature of the LC, provides a route towards light-induced control over ion transport and conductance in these supramolecular complexes.

scholarly journals Ion conformation and orientational order in a dicationic ionic liquid crystal studied by solid-state nuclear magnetic resonance spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Debashis Majhi ◽  
Sergey V. Dvinskikh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystals ◽  
Bond Order ◽  
Van Der Waals ◽  
Orientational Order ◽  
Smectic Phase ◽  
Side Chains ◽  
Dicationic Ionic Liquid ◽  
Ionic Liquid Crystals

AbstractIonic liquids crystals belong to a special class of ionic liquids that exhibit thermotropic liquid-crystalline behavior. Recently, dicationic ionic liquid crystals have been reported with a cation containing two single-charged ions covalently linked by a spacer. In ionic liquid crystals, electrostatic and hydrogen bonding interactions in ionic sublayer and van der Waals interaction in hydrophobic domains are the main forces contributing to the mesophase stabilization and determining the molecular orientational order and conformation. How these properties in dicationic materials are compared to those in conventional monocationic analogs? We address this question using a combination of advanced NMR methods and DFT analysis. Dicationic salt 3,3′-(1,6-hexanediyl)bis(1-dodecylimidazolium)dibromide was studied. Local bond order parameters of flexible alkyl side chains, linker chain, and alignment of rigid polar groups were analyzed. The dynamic spacer effectively “decouples” the motion of two ionic moieties. Hence, local order and alignment in dicationic mesophase were similar to those in analogous single-chain monocationic salts. Bond order parameters in the side chains in the dicationic smectic phase were found consistently lower compared to double-chain monocationic analogs, suggesting decreasing contribution of van der Waals forces. Overall dication reorientation in the smectic phase was characterized by low values of orientational order parameter S. With increased interaction energy in the polar domain the layered structure is stabilized despite less ordered dications. The results emphasized the trends in the orientational order in ionic liquid crystals and contributed to a better understanding of interparticle interactions driving smectic assembly in this and analogous ionic mesogens.

Molecular dynamics and electrical conductivity of Guanidinium based ionic liquid crystals: Influence of cation headgroup configuration

2021 ◽  
Vol 330 ◽  
pp. 115666
Author(s):  
Mohamed A. Kolmangadi ◽  
Arda Yildirim ◽  
Kathrin Sentker ◽  
Martin Butschies ◽  
Andrea Bühlmeyer ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electrical Conductivity ◽  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Liquid Crystals

Liquid-crystalline behaviour and electrorheological effect of phthalocyanine-based ionic liquid crystals

2020 ◽  
pp. 1-10
Author(s):  
Aikebaier Reheman ◽  
Shuangying Hu ◽  
Lianjun Cao ◽  
Danhua Xie ◽  
Guiyang Yan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Electrorheological Effect ◽  
Ionic Liquid Crystals

Intramolecular Diels Alder reactions in highly organized imidazolium salt-based ionic liquid crystals

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 635-639 ◽  
Author(s):  
Tien Dat Do ◽  
Andreea R. Schmitzer
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Diels Alder ◽  
Imidazolium Salts ◽  
Imidazolium Salt ◽  
New Family ◽  
Ionic Liquid Crystals

This paper describes the development of a new family of ionic liquid crystals based on imidazolium salts and their applications as media for intramolecular Diels Alder reactions.

A study of dendritic ionic liquid crystals: Using (S)-4-citronellyloxybenzoic acid and polypropylene imine dendrimers

2016 ◽  
Vol 216 ◽  
pp. 209-215 ◽  
Author(s):  
Harun Nezih Türkçü ◽  
Hale Ocak ◽  
Mustafa U. Gürbüz ◽  
Fatih Çakar ◽  
Belkiz Bilgin-Eran ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Liquid Crystals

Effect of counter ions on the mesogenic ionic N-phenylpyridiniums

CrystEngComm ◽  
2018 ◽  
Vol 20 (18) ◽  
pp. 2593-2607 ◽  
Author(s):  
Ren-Tzong Wang ◽  
Gene-Hsiang Lee ◽  
Chung K. Lai
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Counter Ions ◽  
Ionic Liquid Crystals ◽  
Mesomorphic Properties

Two series of ionic liquid crystals (ILCs) derived from N-phenylpyridinium 1–2 were prepared and their mesomorphic properties were investigated.

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