scholarly journals Photoluminescence of self-assembled Ag(i) and Au(i) N-heterocyclic carbene complexes. Interplay the aurophilic, hydrogen bonding and hydrophobic interactions

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14611-14617 ◽  
Author(s):  
Herbert J. H. Syu ◽  
Josh Y. Z. Chiou ◽  
Ju-Chun Wang ◽  
Ivan J. B. Lin
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystal ◽  
Phase Formation ◽  
Alkyl Chain ◽  
Hydrophobic Interactions ◽  
Hydroxyl Group ◽  
Liquid Crystal Phase ◽  
Carbene Complexes ◽  
Hydrogen Bonding Interactions ◽  
Long Alkyl Chain

The incorporation of a 2-hydroxyl group at the long alkyl chain of NHC increases the hydrogen bonding interactions and thus induces the liquid crystal phase formation for the tetra nuclear Ag–NHC complex.

Effect of the functional diamine structure on the properties of a polyimide liquid crystal alignment film

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25348-25356 ◽  
Author(s):  
Ming Liu ◽  
Xinguo Zheng ◽  
Shiming Gong ◽  
Lulu Liu ◽  
Zhen Sun ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Alkyl Chain ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment ◽  
Long Alkyl Chain

A novel functional diamine containing triphenylamine moiety and biphenyl as well as a long alkyl chain, 4-dodecyloxy-biphenyl-4′,4′′-diaminotriphenylamine (DBDTA), was synthesized and characterized.

scholarly journals Single-crystal X-ray diffraction study of a host–guest system comprising monofunctionalized-hydroxy pillar[5]arene and 1-octanamine

2018 ◽  
Vol 74 (8) ◽  
pp. 1117-1120
Author(s):  
Talal F. Al-Azemi ◽  
Mickey Vinodh ◽  
Abdirahman A. Mohamod ◽  
Fatemeh H. Alipour
Keyword(s):  
Hydrogen Bonding ◽  
Alkyl Chain ◽  
Supramolecular Interactions ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Guest Species ◽  
Guest System ◽  
Macrocycle Cavity

Co-crystallization of a monofunctionalized hydroxy pillar[5]arene with 1-octanamine resulted in the formation of an inclusion complex where the alkyl chain is threaded in the macrocycle cavity, namely 1,2,3,4-(1,4-dimethoxy)-5-(1-hydroxy-4-methoxy)-pillar[5]arene–1-octanamine–water (1/1/1), C44H48O10·C8H19N·H2O. The guest compound is stabilized inside the cavity by hydrogen-bonding and C—H...π interactions. The water molecule in the asymmetric unit mediates the formation of a supramolecular dimer by hydrogen-bonding interactions. These functionalized-pillararene hosts expand the possibility of exploring more supramolecular interactions with various guest species.

scholarly journals Novel HIV-1 Protease Inhibitors (PIs) Containing a Bicyclic P2 Functional Moiety, Tetrahydropyrano-Tetrahydrofuran, That Are Potent against Multi-PI-Resistant HIV-1 Variants

2011 ◽  
Vol 55 (4) ◽  
pp. 1717-1727 ◽  
Author(s):  
Kazuhiko Ide ◽  
Manabu Aoki ◽  
Masayuki Amano ◽  
Yasuhiro Koh ◽  
Ravikiran S. Yedidi ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Protease Inhibitors ◽  
Main Chain ◽  
Hydrophobic Interactions ◽  
Drug Resistant ◽  
Hydrogen Bonding Interactions ◽  
Immunodeficiency Virus ◽  
Hiv 1

ABSTRACTWe identified GRL-1388 and -1398, potent nonpeptidic human immunodeficiency virus type 1 (HIV-1) protease inhibitors (PIs) containing a bicyclic P2 functional moiety, tetrahydropyrano-tetrahydrofuran (Tp-THF). GRL-1388 was as potent as darunavir (DRV) against various drug-resistant HIV-1 laboratory strains with 50% effective concentration (EC50s) of 2.6 to 32.6 nM. GRL-1398 was significantly more potent against such variants than DRV with EC50s of 0.1 to 5.7 nM. GRL-1388 and -1398 were also potent against multiple-PI-resistant clinical HIV-1 variants (CLHIV-1MDR) with EC50s ranging from 2.7 to 21.3 nM and from 0.3 to 4.8 nM, respectively. A highly DRV-resistant HIV-1 variant selectedin vitroremained susceptible to GRL-1398 with the EC50of 21.9 nM, while the EC50of DRV was 214.1 nM. When HIV-1NL4-3was selected with GRL-1398, four amino acid substitutions—leucine to phenylalanine at a position 10 (L10F), A28S, L33F, and M46I—emerged, ultimately enabling the virus to replicate in the presence of >1.0 μM the compound beyond 57 weeks of selection. When a mixture of 10 differentCLHIV-1MDRstrains was selected, the emergence of resistant variants was more substantially delayed with GRL-1398 than with GRL-1388 and DRV. Modeling analyses revealed that GRL-1398 had greater overall hydrogen bonding and hydrophobic interactions than GRL-1388 and DRV and that GRL-1388 and -1398 had hydrogen bonding interactions with the main chain of the active-site amino acids (Asp29 and Asp30) of protease. The present findings warrant that GRL-1398 be further developed as a potential drug for treating individuals with HIV-1 infection.

scholarly journals Bis(μ2-benzoato-κ2 O,O′)bis(benzoato-κO)bis(ethanol-κO)bis(μ3-hydroxido)hexakis(μ-pyrazolato-κ2 N,N′)hexacopper(II) ethanol disolvate

IUCrData ◽  
2019 ◽  
Vol 4 (9) ◽  
Author(s):  
Marisol Ledezma-Gairaud ◽  
Leslie W. Pineda
Keyword(s):  
Hydrogen Bonding ◽  
Solvent Molecule ◽  
The Other ◽  
Hydroxyl Group ◽  
Asymmetric Unit ◽  
Coordination Environment ◽  
Hydrogen Bonding Interactions ◽  
Carboxylate Groups ◽  
Square Planar ◽  
Supramolecular Arrangements

Trinuclear copper–pyrazolate entities are present in various Cu-based enzymes and nanojar supramolecular arrangements. The reaction of copper(II) chloride with pyrazole (pzH) and sodium benzoate (benzNa) assisted by microwave radiation afforded a neutral centrosymmetric hexanuclear copper(II) complex, [Cu6(C7H5O2)4(OH)2(C3H3N2)6(C2H5OH)2]·2C2H5OH. Half a molecule is present in the asymmetric unit that comprises a [Cu3(μ3-OH)(pz)3]2+ core with the copper(II) atoms arranged in an irregular triangle. The three copper(II) atoms are bridged by an O atom of the central hydroxyl group and by three bridging pyrazolate ligands on each of the sides. The carboxylate groups show a chelating mode to one and a bridging syn,syn mode to the other two CuII atoms. The coordination environment of one CuII atom is square-planar while it is distorted square-pyramidal for the other two. Two ethanol molecules are present in the asymmetric unit, one binding to one of the CuII atoms, one as a solvent molecule. In the crystal, stabilization arises from intermolecular O—H...O hydrogen-bonding interactions.

scholarly journals New Liquid Crystal Assemblies Based on Cyano-Hydrogen Bonding Interactions

2021 ◽  
Vol 9 ◽  
Author(s):  
Mohamed Hagar ◽  
Hoda A. Ahmed ◽  
Rua B. Alnoman ◽  
Mariusz Jaremko ◽  
Abdul-Hamid Emwas ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystal ◽  
Density Functional ◽  
Scanning Calorimetry ◽  
Hydrogen Bonding Interactions ◽  
Temperature Ranges ◽  
Dimensional Parameters ◽  
Ft Ir ◽  
Experimental Findings ◽  
Chain Lengths

A new selection of supramolecular liquid crystal complexes based on complementary molecules formed via hydrogen-bonding interactions is reported. All prepared complexes were prepared from 4-n-alkoxybenzoic acid (An) and N-4-cyanobenzylidene-4-n-(hexyloxy)benzenamine (I). FT-IR, temperature gradient NMR, Mass Spectrometer and Chromatography spectroscopy were carried out to confirm the -CN and −COOH H-bonded complexation by observing their Fermi-bands and the effects of the 1H-NMR signals as well as its elution signal from HPLC. Moreover, binary phase diagrams were established for further confirmation. All formed complexes (I/An) were studied by the use of differential scanning calorimetry and their phase properties were validated through the use of polarized optical microscopy Results of mesomorphic characterization revealed that all presented complexes exhibited enantiotropic mesophases and their type was dependent on the terminal lengths of alkoxy chains. Also, the mesomorphic temperature ranges decreased in the order I/A6 > I/A8 > I/A10 > I/A16 with linear dependency on the chain length. Finally, the density functional theory computational modeling has been carried out to explain the experimental findings. The relation between the dimensional parameters was established to show the effect of the aspect ratio on the mesophase range and stability. The normalized entropy of the clearing transitions (∆S/R) was calculated to illustrate the molecular interaction enhancements with the chain lengths.

Exfoliation and liquid crystal phase formation of layered double hydroxide into waterborne polyurethane coatings

Soft Matter ◽  
2011 ◽  
Vol 7 (9) ◽  
pp. 4242 ◽  
Author(s):  
Anne-Lise Troutier-Thuilliez ◽  
Horst Hintze-Bruening ◽  
Christine Taviot-Guého ◽  
Vincent Verney ◽  
Fabrice Leroux
Keyword(s):  
Liquid Crystal ◽  
Layered Double Hydroxide ◽  
Phase Formation ◽  
Waterborne Polyurethane ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Polyurethane Coatings ◽  
Double Hydroxide

Effects of Added Silica Nanoparticles on the Nematic Liquid Crystal Phase Formation in Beidellite Suspensions

2014 ◽  
Vol 118 (18) ◽  
pp. 4913-4919 ◽  
Author(s):  
Jasper Landman ◽  
Erwan Paineau ◽  
Patrick Davidson ◽  
Isabelle Bihannic ◽  
Laurent J. Michot ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Silica Nanoparticles ◽  
Nematic Liquid Crystal ◽  
Phase Formation ◽  
Crystal Phase ◽  
Liquid Crystal Phase

Unique orientations and rotational dynamics of a 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid at the gas–liquid interface: the effects of the hydrogen bond and hydrophobic interactions

2018 ◽  
Vol 20 (17) ◽  
pp. 12043-12052 ◽  
Author(s):  
Deshuai Yang ◽  
Fangjia Fu ◽  
Li Li ◽  
Zhen Yang ◽  
Zheng Wan ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Ionic Liquid ◽  
Hydrogen Bonding ◽  
Hydrophobic Interactions ◽  
Liquid Interface ◽  
Rotational Dynamics ◽  
Two Stage ◽  
Hydrogen Bonding Interactions ◽  
Rotational Motions

Two-stage rotational motions of the interfacial [BMIM]+ cations are essentially determined by both hydrophobic and hydrogen-bonding interactions.

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