Mesophase study of pure and doped cyanobiphenyl liquid crystals with salen-type systems

Bendahou, Amal; Khouba, Zoulikha; Benabdallah, Tayeb; Maschke, Ulrich

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1080/02678292.2018.1435827

Permalink :

http://hdl.handle.net/20.500.12210/36870

Title :

Mesophase study of pure and doped cyanobiphenyl liquid crystals with salen-type systems

Author(s) :

Bendahou, Amal [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Khouba, Zoulikha [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Benabdallah, Tayeb [Auteur]
Université des sciences et de la Technologie d'Oran Mohamed Boudiaf [Oran] [USTO MB]
Maschke, Ulrich [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]

Journal title :

Liquid Crystals

Volume number :

Pages :

1312-1323

Publisher :

Informa UK Limited

Publication date :

2018-02-15

HAL domain(s) :

Chimie/Matériaux
Chimie/Polymères

English abstract : [en]

In the current study, two salenSchiff base ligands derived from the condensation of ethylendiamine on salicylaldehyde and 5-chlorosalicylaldehyde, namely, N,N’-bis( salicylidene)ethylene-diamine(L1) and N,N’-bis(5-chloro ...
Show more >In the current study, two salenSchiff base ligands derived from the condensation of ethylendiamine on salicylaldehyde and 5-chlorosalicylaldehyde, namely, N,N’-bis( salicylidene)ethylene-diamine(L1) and N,N’-bis(5-chlorosalicylidene)ethylene-diamine (L2)as well as two of their iron(III) and nickel(II) complexes were prepared, and then used as doping agents of two thermotropic liquid crystals of cyanobiphenyle type, namely, 4-cyano-4’-n-pentyl (5CB) and 4′-n-octyl-4-cyano-biphenyl (8CB). The study of the mesophase of pure and doped liquid crystals was carried out by UV-visible spectroscopy equipped with a heating compartment for precise temperature control, differential scanning calorimetry and polarized optical microscopy. The characteristic transition temperatures, nematic-isotropic, TNI, and/or smectic-nematic, TSN, of liquid crystals based systems were measured and then compared to those of the literature concerning pure 5CB and 8CB. Optical microscopy has shown the existence of Schlieren and focal conic textures of the nematic and smectic states respectively, both of pure and doped liquid crystals. The homogeneity of the obtained guest-host systems was proven by the linear evolution of their transition temperatures as function of the concentration in solute, with correlation factors near to unity.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Ingénierie des Systèmes Polymères

Submission date :

2019-05-17T09:11:27Z
2019-10-23T06:51:13Z
2021-01-08T19:47:03Z

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2	20.500.12210/36870*	2021-01-08T19:45:32Z
1	20.500.12210/36870.1	2019-10-23T06:51:13Z

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