scholarly journals New chair shaped supramolecular complexes-based aryl nicotinate derivative; mesomorphic properties and DFT molecular geometry

RSC Advances ◽  
2019 ◽  
Vol 9 (29) ◽  
pp. 16366-16374 ◽  
Author(s):  
H. A. Ahmed ◽  
M. Hagar ◽  
O. A. Alhaddad
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystalline ◽  
Molecular Geometry ◽  
Supramolecular Complexes ◽  
Intermolecular Hydrogen Bonding ◽  
Mesomorphic Properties ◽  
Methyl Phenyl

A new series of chair-shaped liquid crystalline complexes were formed through 1 : 1 intermolecular hydrogen bonding between 4-(4-(hexyloxyphenylimino)methyl)phenyl nicotinate and 4-alkoxybenzoic acids, with different alkoxy chains.

scholarly journals Chair- and V-Shaped of H-bonded Supramolecular Complexes of Azophenyl Nicotinate Derivatives; Mesomorphic and DFT Molecular Geometry Aspects

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1510 ◽  
Author(s):  
Omaima A. Alhaddad ◽  
Khulood A. Abu Al-Ola ◽  
Mohamed Hagar ◽  
Hoda A. Ahmed
Keyword(s):  
Hydrogen Bonding ◽  
Density Functional ◽  
Liquid Crystalline ◽  
Molecular Geometry ◽  
Supramolecular Complexes ◽  
Scanning Calorimetry ◽  
Geometrical Structures ◽  
Functional Theory ◽  
Ft Ir ◽  
Nematic Phases

New geometrical architectures of chair- and V-shaped supramolecular liquid crystalline complexes were molded through 1:1 intermolecular hydrogen bonding interactions between 4-(4-(hexyloxy)phenylazo)methyl)phenyl nicotinate and 4-alkoxybenzoic acids. The length of terminal alkoxy acid chains varied, n = 6 to 16 carbons. The mesomorphic behaviour of these complexes was examined through differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fourier-transform infrared spectroscopy (FT-IR) was carried out to confirm the presence of Fermi bands that appeared for the hydrogen bonding formation. Enantiotropic nematic phases were observed and covered all lengths of alkoxy chains. The geometrical structures of the prepared supramolecular complexes geometries were estimated by Density functional theory (DFT) calculations. The supramolecular complexes I/An are projected to exhibit a nonlinear geometry with V-shaped and chair-shaped geometry. The chair-shaped conformers of I/An were found to be more stable than V-shaped isomeric complexes. Moreover, the effect of the change of the mesogenic core on the mesophase thermal stability (TC) has been investigated by a comparative study of the present azo supramolecular H-bonding LCs (SMHBCs) I/An and our previously reported their Schiff base analogue complexes, II/An. The findings of the DFT illustrated the high impact of CH=N as a mesogenic core on the mesomorphic behavior in terms of the competitive lateral and terminal intermolecular interactions as well as the molecular electrostatic potential (MEP).

Symmetric bi-pyridyl banana-shaped molecule and its intermolecular hydrogen bonding liquid-crystalline complexes

2008 ◽  
Vol 891 (1-3) ◽  
pp. 312-316 ◽  
Author(s):  
Dan Sui ◽  
Qiufei Hou ◽  
Jia Chai ◽  
Ling Ye ◽  
Liyan Zhao ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystalline ◽  
Intermolecular Hydrogen Bonding

The Effect of Hydrogen Bonding on the Mesomorphic Properties for Side Chain Type Liquid Crystalline Polyurethanes

1996 ◽  
Vol 425 ◽  
Author(s):  
T. Mihara ◽  
N. Koide
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystalline ◽  
Side Chain ◽  
Flexible Chain ◽  
Remarkable Change ◽  
Polymer Backbone ◽  
Phase Transition Temperatures ◽  
Ft Ir ◽  
Mesomorphic Properties ◽  
Chain Type

AbstractMesomorphic properties and temperature dependence of the hydrogen bonding between urethane bonds (H-bonding) for side chain type liquid crystalline polyurethane(SLCPU)s were studied by thermally controlled FT-IR spectroscopy. A remarkable change in the strength of H-bonding for SLCPUs with a flexible chain in the polymer backbone(flexible SLCPUs) was displayed near the phase transition temperatures, while small changes in the strength of H-bonding for SLCPUs with a rigid moiety in the polymer backbone(rigid SLCPUs) was influenced by a mesogenic group in the side chain and the flexible chain length in the polymer backbone. Furthermore, in order to study the influence of H-bonding in rigid SLCPUs, polyurethane derivatives with methyl group were synthesized replacing hydrogen in urethane bonds. No mesomorphic properties for polyurethane derivatives obtained were exhibited. It was concluded that H-bonding played an important role to exhibit mesomorphic properties of rigid SLCPUs.

scholarly journals {N 1-[2-(Butylselanyl)benzyl]-N 2,N 2-dimethylethane-1,2-diamine}dichloridomercury(II)

2018 ◽  
Vol 74 (8) ◽  
pp. 1151-1154
Author(s):  
Pushpendra Singh ◽  
Harkesh B. Singh ◽  
Ray J. Butcher
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Self Assembly ◽  
Title Compound ◽  
Supramolecular Assembly ◽  
Molecular Geometry ◽  
The Self ◽  
Intermolecular Hydrogen Bonding ◽  
Hydrogen Bonding Interactions ◽  
Donor Acceptor

In the title compound, [HgCl2(C16H28N2Se)], the primary geometry around the Se and Hg atoms is distorted trigonal–pyramidal and distorted square-pyramidal, respectively. The distortion of the molecular geometry in the complex is caused by the steric demands of the ligands attached to the Se atom. The Hg atom is coordinated through two chloride anions, an N atom and an Se atom, making up an unusual HgNSeCl2 coordination sphere with an additional long Hg...N interaction. Intermolecular C—H...Cl interactions are the only identified intermolecular hydrogen-bonding interactions that seem to be responsible for the self assembly. These relatively weak C—H...Cl hydrogen bonds possess the required linearity and donor–acceptor distances. They act as molecular associative forces that result in a supramolecular assembly along the b-axis direction in the solid state of the title compound.

Calamitic Liquid Crystalline Molecules with Lateral Intermolecular Hydrogen Bonding

2005 ◽  
Vol 439 (1) ◽  
pp. 173/[2039]-177/[2043] ◽  
Author(s):  
Shigeo Kohmoto ◽  
Makoto Yamamoto ◽  
Keiki Kishikawa ◽  
Takashi Kajitani
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystalline ◽  
Intermolecular Hydrogen Bonding
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