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      Electric-Field Response of Discotic Hexabenzocoronene (HBC) Liquid Crystals

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      Author(s): , , *
      Publication date (Electronic):
      Journal: Molecules
      Publisher: MDPI
      Keywords: discotic liquid crystal, hexabenzocoronene, electric field response, phase transition

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          Abstract

          A HBC derivative bearing six branched, space-demanding, alkyl side chains containing ether linkages has been synthesized and its thermotropic properties were investigated by polarization optical microscopy (POM) and differential scanning calorimetry (DSC). To our surprise, this molecule can respond to electric fields, and the influences of alternating current (AC) and directing current (DC) electric field on the assembly of this molecule in liquid crystal cells were discussed.

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          Discotic liquid crystals: a new generation of organic semiconductors.

          Sergey Sergeyev, Wojciech Pisula, Yves Henri Geerts (2007)
          Discotic (disc-like) molecules typically comprising a rigid aromatic core and flexible peripheral chains have been attracting growing interest because of their fundamental importance as model systems for the study of charge and energy transport and due to the possibilities of their application in organic electronic devices. This critical review covers various aspects of recent research on discotic liquid crystals, in particular, molecular design concepts, supramolecular structure, processing into ordered thin films and fabrication of electronic devices. The chemical structure of the conjugated core of discotic molecules governs, to a large extent, their intramolecular electronic properties. Variation of the peripheral flexible chains and of the aromatic core is decisive for the tuning of self-assembly in solution and in bulk. Supramolecular organization of discotic molecules can be effectively controlled by the choice of the processing methods. In particular, approaches to obtain suitable macroscopic orientations of columnar superstructures on surfaces, that is, planar uniaxial or homeotropic alignment, are discussed together with appropriate processing techniques. Finally, an overview of charge transport in discotic materials and their application in optoelectronic devices is given.
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            Fast photoconduction in the highly ordered columnar phase of a discotic liquid crystal

            D. Adam, P. Schuhmacher, J. Simmerer … (1994)
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              Iron(iii) chloride in oxidative C–C coupling reactions

              Abdelwareth Sarhan, Carsten Bolm (2009)
              In this critical review, the use of iron(III) chloride in oxidative C-C couplings of arenes and related unsaturated compounds is presented and reviewed. The approach allows highly selective dimerisations of phenol derivatives, naphthols, and heterocyclic compounds. Sequential couplings give access to structurally well-defined oligo- and polymers. Iron(III) chloride is commercially available and inexpensive. Being a mild oxidising agent it has been applied in numerous reactions leading to new carbon-carbon-bonds in complex molecular arrays (107 references).
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                Author and article information

                Journal
                Journal ID (nlm-ta): Molecules
                Journal ID (iso-abbrev): Molecules
                Journal ID (publisher-id): molecules
                Title: Molecules
                Publisher: MDPI
                ISSN (Electronic): 1420-3049
                Publication date (Electronic): 31 October 2011
                Publication date Collection: November 2011
                Volume: 16
                Issue: 11
                Pages: 9101-9108
                Affiliations
                Laboratory of Printing and Packaging Material and Technology, Beijing Institute of Graphic Communication, Daxing District, Xinghuabeilu 25, Beijing 102600, China
                Author notes
                [* ] Author to whom correspondence should be addressed; Email: pujialing@ 123456bigc.edu.cn .
                Article
                Publisher ID: molecules-16-09101
                DOI: 10.3390/molecules16119101
                PMC ID: 6264135
                PubMed ID: 22041883
                SO-VID: edfe7c29-2f37-4e64-9080-1c805ea72d69
                Copyright © © 2011 by the authors;
                License:

                licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                Date received : 13 September 2011
                Date revision received : 19 October 2011
                Date accepted : 20 October 2011
                Categories
                Subject: Article

                Keywords: discotic liquid crystal,hexabenzocoronene,electric field response,phase transition
                Data availability:
                Keywords: discotic liquid crystal, hexabenzocoronene, electric field response, phase transition

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