Nematic Phase Induced from Symmetrical Supramolecular H-Bonded Systems Based on Flexible Acid Core

被引：14

作者：

Ahmed, Hoda A. ^{[1
,2
]}

Khushaim, Muna S. ^{[3
,4
]}

机构：

[1] Cairo Univ, Fac Sci, Dept Chem, Cairo 12613, Egypt

[2] Taibah Univ, Coll Sci, Chem Dept, Yanbu 30799, Saudi Arabia

[3] Taibah Univ, Fac Sci, Dept Phys, Al Madina 41447, Saudi Arabia

[4] Taibah Univ, Nanotechonolgy Ctr, Al Madina 41447, Saudi Arabia

来源：

CRYSTALS | 2020年 / 10卷 / 09期

关键词：

adipic acid; supramolecular H-bonding complexes; X-ray diffraction; induced nematic phase; photo-physical properties; LIQUID-CRYSTALLINE COMPLEXES; BEHAVIOR; FTIR; MESOPHASES;

D O I：

10.3390/cryst10090801

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

New symmetrical 1:2 supramolecular H-bonded liquid crystals (SMHBLCs) interactions,A/2Bn, were formed between adipic acid and 4-(4 '-pyridylazophenyl) 4 ''-alkoxybenzoates. Optical and mesomorphic behaviors of the prepared SMHBLC complexes were investigated using differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). FT-IR spectroscopy was carried out to confirm the H-bond interactions of the prepared complexes via Fermi bands formation. Their photo-physical properties were investigated by UV-spectroscopy and the observed absorbance values were found to be mainly dependent on the length of the terminal alkoxy chain. Mesomorphic behaviour for allA/2Bncomplexes revealed that all complexes are dimorphic-exhibiting enantiotropic mesophases with induced nematic phases, except for the long chain terminal complex which exhibits only a monomorphic smectic A phase. In order to investigate the effect of mesogenic core geometry on the mesophase properties, a comparison was established between the mesomeric behaviors of the present complexes and previously reported rigid core acid complexes. Finally, the XRD pattern confirmed the POM and DSC results.

引用

页码：1 / 13

页数：13

共 55 条

[1]

ABBERLEY JP, 2018, NAT COMMUN, V9

[2] New chair shaped supramolecular complexes-based aryl nicotinate derivative; mesomorphic properties and DFT molecular geometry [J].

Ahmed, H. A. ;

Hagar, M. ;

Alhaddad, O. A. .

RSC ADVANCES, 2019, 9 (29) :16366-16374

[3] Wide nematic phases induced by hydrogen-bonding [J].

Ahmed, H. A. ;

Hagar, M. ;

Alaasar, M. ;

Naoum, M. .

LIQUID CRYSTALS, 2019, 46 (04) :550-559

[4] Mesophase behavior of new linear supramolecular hydrogen-bonding complexes [J].

Ahmed, H. A. ;

Hagar, M. ;

Aljuhani, A. .

RSC ADVANCES, 2018, 8 (61) :34937-34946

[5] Mesophase behaviour of 1:1 mixtures of 4-n-alkoxyphenylazo benzoic acids bearing terminal alkoxy groups of different chain lengths [J].

Ahmed, H. A. ;

Naoum, M. M. ;

Saad, G. R. .

LIQUID CRYSTALS, 2016, 43 (09) :1259-1267

[6] Photoresponsive halogen bonded polycatenar liquid crystals [J].

Alaasar, Mohamed ;

Poppe, Silvio ;

Tschierske, Carsten .

JOURNAL OF MOLECULAR LIQUIDS, 2019, 277 :233-240

[7]

ALHADDAD OA, 2020, MOLECULES, V0025

[8] Chair- and V-Shaped of H-bonded Supramolecular Complexes of Azophenyl Nicotinate Derivatives; Mesomorphic and DFT Molecular Geometry Aspects [J].

Alhaddad, Omaima A. ;

Abu Al-Ola, Khulood A. ;

Hagar, Mohamed ;

Ahmed, Hoda A. .

MOLECULES, 2020, 25 (07)

[9] Characterization of New H-Bonded Liquid Crystalline Complexes Based on Iminophenyl Nicotinate [J].

Alnoman, Rua B. ;

Hagar, Mohamed ;

Ahmed, Hoda A. ;

Abu Al-Ola, Khulood A. ;

Naoum, Magdi M. ;

Al-Elati, Fahad ;

Abdullah Zaid, Yousef ;

Alsharif, Abdulrahman ;

Al-Juhani, Yazeed ;

Abulrhelh, Abdulmjeed .

CRYSTALS, 2020, 10 (06) :1-14

[10] Induced Phases of New H-bonded Supramolecular Liquid Crystal Complexes; Mesomorphic and Geometrical Estimation [J].

Alnoman, Rua B. ;

Ahmed, Hoda A. ;

Hagar, Mohamed ;

Abu Al-Ola, Khulood A. ;

Alrefay, Bedor Sh. ;

Haddad, Bashayer A. ;

Albalawi, Raghad F. ;

Aljuhani, Razan H. ;

Aloqebi, Lama D. ;

Alsenani, Shoaa F. .

MOLECULES, 2020, 25 (07)

← 1 2 3 4 5 6 →