Combined effect of ether and siloxane substituents on imidazolium ionic liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 64821-64831 ◽  
Author(s):  
Santosh N. Chavan ◽  
Debaprasad Mandal
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Degree Of Freedom ◽  
Combined Effect ◽  
Size Factor ◽  
Imidazolium Ionic Liquids ◽  
Imidazolium Cations ◽  
Coulombic Attraction

The combined effect of ether and siloxane substituents on imidazolium cations helps overcome the Coulombic attraction, van der Waals forces, size factor and conformational degree of freedom, and exerts an impact on viscosity, density and thermal properties of ionic liquids.

scholarly journals Synthesis, conformational studies, vibrational spectra and thermal properties, of new 1,4-(phenylenebis(methylene) bis(methyl-imidazolium) ionic liquids

2020 ◽  
Vol 1220 ◽  
pp. 128731
Author(s):  
Mostefa Boumediene ◽  
Boumediene Haddad ◽  
Annalisa Paolone ◽  
Mohammed Amin Assenine ◽  
Didier Villemin ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Vibrational Spectra ◽  
Conformational Studies ◽  
Imidazolium Ionic Liquids

Thermal properties of imidazolium ionic liquids

2000 ◽  
Vol 357-358 ◽  
pp. 97-102 ◽  
Author(s):  
Helen L Ngo ◽  
Karen LeCompte ◽  
Liesl Hargens ◽  
Alan B McEwen
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Imidazolium Ionic Liquids

scholarly journals Designing Imidazolium Poly(amide-amide) and Poly(amide-imide) Ionenes and Their Interactions with Mono- and Tris(imidazolium) Ionic Liquids

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1254
Author(s):  
Kathryn E. O’Harra ◽  
Danielle M. Noll ◽  
Irshad Kammakakam ◽  
Emily M. DeVriese ◽  
Gala Solis ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Small Molecules ◽  
Self Assembly ◽  
High Performance ◽  
Structural Changes ◽  
Intermolecular Forces ◽  
Polymer Composition ◽  
Structural Effects ◽  
Imidazolium Ionic Liquids

Here we introduce the synthesis and thermal properties of a series of sophisticated imidazolium ionenes with alternating amide-amide or amide-imide backbone functionality, and investigate the structural effects of mono(imidazolium) and unprecedented tris(imidazolium) ionic liquids (ILs) in these ionenes. The new set of poly(amide-amide) (PAA) and poly(amide-imide) (PAI) ionenes represent the intersection of conventional high-performance polymers with the ionene archetype–presenting polymers with alternating functional and ionic elements precisely sequenced along the backbone. The effects of polymer composition on the thermal properties and morphology were analyzed. Five distinct polymer backbones were synthesized and combined with a stoichiometric equivalent of the IL 1-benzyl-3-methylimidazolium bistriflimide ([Bnmim][Tf2N]), which were studied to probe the self-assembly, structuring, and contributions of intermolecular forces when IL is added. Furthermore, three polyamide (PA) or polyimide (PI) ionenes with simpler xylyl linkages were interfaced with [Bnmim][Tf2N] as well as a novel amide-linked tris(imidazolium) IL, to demonstrate the structural changes imparted by the inclusion of functional, ionic additives dispersed within the ionene matrix. This work highlights the possibilities for utilizing concepts from small molecules which exhibit supramolecular self-assembly to guide creative design and manipulate the structuring of ionenes.

Swallow-Tailed Fluorinated-Alkoxy-Substituted Hexa-Peri-Hexabenzocoronene: Synthesis and Characterization

2014 ◽  
Vol 1004-1005 ◽  
pp. 661-664 ◽  
Author(s):  
Fei Lin ◽  
Wen Guang Wang ◽  
Jia Ling Pu
Keyword(s):  
Thermal Properties ◽  
Absorption Spectra ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Synthesis And Characterization ◽  
Follow Up Study

Synthesis and characterization of a novel hexabenzocoronene (HBC) derivative bearing swallow-tailed fluorinated alkoxy chains are described. The six peripheral fluorinated chains, well known for their low van der Waals forces, should result as expected in reduced inter-columnar interactions. The UV−vis absorption spectra of this compound appeared in 230-390 nm region. The thermal properties are waiting for the follow-up study.

scholarly journals Selective separation of trivalent f-ions using 1,10-phenanthroline-2,9-dicarboxamide ligands in ionic liquids

2016 ◽  
Vol 45 (29) ◽  
pp. 11624-11627 ◽  
Author(s):  
Jérémy Dehaudt ◽  
Neil J. Williams ◽  
Ilya A. Shkrob ◽  
Huimin Luo ◽  
Sheng Dai
Keyword(s):  
Ionic Liquids ◽  
Selective Separation ◽  
Imidazolium Ionic Liquids ◽  
Alkyl Chains ◽  
Imidazolium Cations

1,10-Phenanthroline-2,9-dicarboxamide complexants decorated with alkyl chains and imidazolium cations have been studied for extraction of trivalent f-ions into imidazolium ionic liquids.

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

2020 ◽  
Author(s):  
Daniel B. Straus ◽  
Robert J. Cava
Keyword(s):  
Organic Synthesis ◽  
Self Assembly ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
High Symmetry ◽  
Molecular Chirality ◽  
Chiral Materials ◽  
Self Assembled ◽  
Chiral Centers

The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C<sub>60</sub>(SnI<sub>4</sub>)<sub>2</sub> from icosahedral buckminsterfullerene (C<sub>60</sub>) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI<sub>4</sub> tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi<sub>2</sub> type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

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.

scholarly journals Nanotube‐Based 1D Heterostructures Coupled by van der Waals Forces

Small ◽  
2021 ◽  
pp. 2102585
Author(s):  
Sofie Cambré ◽  
Ming Liu ◽  
Dmitry Levshov ◽  
Keigo Otsuka ◽  
Shigeo Maruyama ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Forces
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