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Dissertations / Theses on the topic 'Mesogenic'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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1

Racz, Neil M. P. "Synthesis of potentially mesogenic substituted biphenylenes and triphenylenes." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336851.

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2

Buckley, Christina Maria. "Synthesis and mesogenic properties of acylhydrazinato metal complexes." Thesis, University of Central Lancashire, 1995. http://clok.uclan.ac.uk/19768/.

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Previous work at this institute involved the successful synthesis of liquid crystalline nickel(II) and copper(II) metal complexes based on the N-methylidene(4'-n-alkoxybenzoyl)hydrazone ligand. The primary aim of this study was to determine the structural variations which would still permit mesophase formation in these recently discovered liquid crystalline acyihydrazinato metal complexes. The potential mesogens were synthesised, characterised spectroscopically and the effects of the structural changes on the mesophase characteristics determined by a combination of polarising microscopy, DSC a
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3

Nicholas, B. M. "The synthesis and properties of some new mesogenic materials." Thesis, University of Hull, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376375.

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4

Cromhout, Natalie Lyn. "Studies on photochromic and potentially mesogenic mercury(II) dithizonates." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/21428.

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The 4-( 4 '-n-alkoxybenzylideneanilino )mercury(II) dithizonates, CₙH₂ₙ₊₁ OC₆H₄CH=C₆H₄-Hg(HDz) (n = l, 4, 12, 14 or 18), were prepared by complexation of dithizone (1,5-diphenyl- thiocarbazone, H 2 Dz) with the corresponding 4-(4'-n-alkoxybenzylideneanilino)mercury(II) acetates. The 4-( 4 '-n-alkoxybiphenyl)mercury(II) dithizonates, CₙH₂ₙ₊₁ OC6H4 C6H4- Hg(HDz) (n = 4, 5, 10, 14 or 18), were similarly prepared by reaction of dithizone with the appropriate 4-(4'-n-alkoxybiphenyl)mercury(II) bromides, although the latter compounds, derived from the 4-n-alkoxy-4'-bromobiphenyls, were not isolated.
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5

Davis, David Richard. "Synthesis and Mesogenic Properties of Liquid Crystals with Bent Core-Tail Substitution Geometry." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1374770168.

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6

Brown, Judith. "Synthesis and use of Mesogenic Stabilisers and Anisotropic Dichroic Particles." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499911.

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7

Adam, Colin John. "Molecular properties of mesogenic fragments and molecules from first principles." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/10776.

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In order to gain a deeper understanding of the relationship between molecular structure and liquid crystal properties, accurate data is required on single molecule properties of mesogenic fragments and molecules. This thesis applies a pseudopotential plane wave total energy method to calculate molecular properties of prototypical mesogenic fragments and the molecule 4-n-pentyl-4'-cyanobiphenyl (5CB) from first principles. Optimised molecular structures, vibrational properties and torsional potentials are determined and found to compare well with experimental observations and other <I>ab initio
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8

McHattie, Gillian S. "Ion transport in liquid crystalline polymer electrolytes." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324432.

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A systematic study of structure-property relations has been carried out on a range of polymers, both with and without mesogenic moieties. These materials have been characterised using various thermal techniques, including DSC and DMTA. These polymers have been complexed with LiClO<sub>4</sub> and the effects of the salt on thermal characteristics have been investigated. In addition, AC impedance spectroscopy has been employed to determine the temperature dependence of the conductivity of these complexes. Results suggest that polymers with mesogenic side groups have the potential to exhibit a c
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9

Elliott, Alice Margaret Sophie. "The physical structure of a system of mesogenic side chain polymers." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388435.

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10

Langley, Philip J. "The synthesis, characterisation and polymerisation of substituted pyrroles bearing pendant mesogenic groups." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385181.

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11

Fuhrmann, Steven. "Synthesis of mesogenic and oligo polyols and their influence on polyurethane properties." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2874.

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Synthesis and properties of various novel polyurethanes (PUs) and poly(urethane ureas) (PUUs) were investigated. The formation of PU prepolymer in bulk was investigated via in and ex situ Infrared spectroscopy to obtain rate constants for various diisocyanates reacting with poly(tetramethylene oxide) (PTMO). PUUs were prepared from PTMO and a modified polyether containing methyl side groups. The introduction of methyl side groups into the polyether reduced the crystallinity of the PUUs and increased both flexibility and phase separation. Several attempts were made to prepare liquid crystalline
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12

Perkins, Steven Patrick. "The effect of molecular structure on the mesogenic properties of liquid crystalline materials." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302348.

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13

Roper, Alan R. "Ionic liquid crystal polymers for display devices : a study of mesogenic diallylamine-terminated polymers." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16863/.

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Exploration into the development and synthesis of ionic polymeric liquid crystal devices for potential use in touch screens and smart windows considered the potential of amine-based functional groups for tunable polymerisations and bulk compound properties. Through consideration of the nature of the functional group as well as the motif, it would be possible to control the polymerisation rate, as well as thermal and potentially conductive properties of the compounds used in the ultimate device. In this study, three different functional groups, as well as three different motifs were considered
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14

Clark, Stephen. "Synthesis, crystal structures and mesogenic properties of some transition metal complexes of substituted phenylmalonaldehyde and related compounds." Thesis, University of Hull, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395685.

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15

Groschopp, Alex. "Kinetik der radikalischen Polymerisation von Monomeren mit mesogener Seitengruppe in isotroper und anisotroper Lösung." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E390-5.

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16

Edwards, Edwin E. "A proposal for the development of a unifying method of designing a wide range of time-temperature indicators using frozen-in birefringence in non-mesogenic polymers." View abstract/electronic edition; access limited to Brown University users, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3318312.

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17

Tamba, Maria Gabriela [Verfasser], W. [Akademischer Betreuer] Weißflog, and R. [Akademischer Betreuer] Zentel. "Design of liquid crystal dimers and trimers : synthesis and characterization of novel systems containing bent-core and calamitic mesogenic units / Maria Gabriela Tamba. Betreuer: W. Weißflog ; R. Zentel." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1069814741/34.

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18

Hahn, Harald. "Synthese und Charakterisierung SiH-funktionalisierter Carbosilane als Bausteine in Bent-Core Mesogenen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600896.

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In der vorliegenden Arbeit wird die Synthese und die Charakterisierung von linearen, sternförmig und dendritisch verzweigten Carbosilanen mit Me2SiH-Funktionen, vorgestellt. So konnten oligomere Carbosilane mit CH2CH2CH2SiMe2- als auch CH2CH2SiMe2-Wiederholungseinheiten dargestellt werden. Als Aufbaureaktionen dienten sowohl Alkylierungsreaktionen mit Allylmagnesiumchlorid als auch Hydrosilylierungsschritte mit Chlordimethyl- und Chlordimethylvinylsilan. Die Überführung der SiMe2Cl-Gruppen in SiMe2H-Funktionen gelang durch die Umsetzung mit Lithiumaluminiumhydrid. Besonderes Augenmerk lag auf
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19

Benning, Stephan Alois. "Lumineszenz mesogener Halbleiter." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973222301.

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20

Nemeş, Alexandru. "Liquid crystal filaments formed by bent shaped mesogens." Clausthal-Zellerfeld Papierflieger, 2008. http://d-nb.info/991645588/04.

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21

Wirth, Ina. "Untersuchungen an "bananenförmigen" Mesogenen." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963009745.

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22

Pahl, Guido. "Chirale radiale Multiin-Mesogene." [S.l.] : [s.n.], 2003. http://edocs.tu-berlin.de/diss/2002/pahl_guido.pdf.

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23

Chambers-Asman, D. M. "Thiophene-based photoresponsive mesogens." Thesis, Nottingham Trent University, 2007. http://irep.ntu.ac.uk/id/eprint/148/.

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This thesis reports the synthesis, transition temperatures and structure-property relationships of a variety of thiophene-containing azobenzene esters derived from either 3-(2-thienyl)acrylic acid (Series I, IV, VI, VIII, X and XII) or 3-(3-thienyl)acrylic acid (Series II, V, VII, IX, XI and XIII) and appropriate fluoro- and non-fluoro-substituted 'azophenols', for potential use in photoresponsive applications. For comparative purposes, the non-heterocyclic cinnamate counterparts (Series III) were also prepared and are reported. All one hundred and thirty final esters are mesomorphic, exhibiti
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24

Komp, Ansgar Michael. "Smektische Elastomere mit perfluorierten Mesogenen." [S.l. : s.n.], 2006.

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25

Stettler, Annett. "Röntgenkristallographische Strukturuntersuchungen an Mesogenen mit unkonventioneller Molekülgestalt." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962286079.

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26

Jahr, Michael. "Neue sternförmige Mesogene: Strukturbildung und Chromophore." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68605.

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Gegenstand der vorliegenden Arbeit ist die Herstellung und Charakterisierung neuer sternförmiger Mesogene. Bei den aufgeführten Sternverbindungen, handelt es sich um Oligobenzoate, bestehend aus aromatischen Hydroxy- oder Aminocarbonsäuren, die durch Kupplungsreaktionen mit Dicylohexycarbodiimid, in einer konvergenten Synthesestrategie verknüpft wurden. Das besondere Augenmerk der Arbeit richtete sich auf die Charakterisierung der von den neuen Substanzen gebildeten Mesophasen, die mit Hilfe von Polarisationsmikrokopie, dynamischer Differenzialkalorimetrie und Röntgenstreuung erfolgte. Zur Au
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27

Herbaut, Antoine Joel. "Compatibilisation of blends of incompatible mesogens." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7321/.

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Controlling the morphology of blends of materials is crucial for organic optoelectronic devices. However, the blends are often made of incompatible materials, resulting in an undesirable macrophase separation. This thesis focusses on the addition of a third component into the immiscible blend of small molecules to control their morphology. After introducing the concept of organic solar cells and the liquid crystalline state of matter, the available methods to control the morphology of blends in these two fields will be reviewed. Model compounds based on triphenylene derivatives was first studi
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28

Hassheider, Thomas. "Elektrooptische Charakterisierung dünner Schichten mesogener, organischer Halbleiter." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968451977.

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29

Begnini, Ieda Maria. "Sinteses de derivados de 1,2,4-oxadiazois 3,5-dissubstituidos como unidade mesogenica." reponame:Repositório Institucional da UFSC, 1991. http://repositorio.ufsc.br/xmlui/handle/123456789/75749.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina. Centro de Ciencias Fisicas e Matematicas<br>Made available in DSpace on 2012-10-16T04:06:05Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T17:07:00Z : No. of bitstreams: 1 87132.pdf: 5035873 bytes, checksum: f4316c85f2dbc6274738e3e1362b69ac (MD5)<br>Neste trabalho faz-se um estudo das sínteses e propriedades mesomórficas de compostos contendo o grupo 1,2,4-oxadiazol 3,5-dissobstituído como unidade mesogênica. Este estudo torna-se interessante devido à importância que os cristais líquidos adquiriram nos últimos anos, p
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30

Passos, Geraldo Elis dos. "Sinteses de derivados de 2,5- dissubstituidos 1,3,4- oxadiazois como unidade mesogenica." reponame:Repositório Institucional da UFSC, 1993. http://repositorio.ufsc.br/xmlui/handle/123456789/75879.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Fisicas e Matematicas<br>Made available in DSpace on 2012-10-16T05:17:56Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T18:03:16Z : No. of bitstreams: 1 91729.pdf: 2093165 bytes, checksum: 61f003edf63abfa3b190d495e44c3efd (MD5)<br>Descreve-se um estudo de síntese e propriedades fisico-químicas de compostos contendo anel heterocíclico 1,3,4-oxadiazois-2,5-dissubstituído como unidade mesogênica. Foram sintetizados compostos do tipo: 2-(p-n-alcoxifenil)-5-(p-y-fenil)-1,3,4-oxadiazol e 2-alquil-5-(p-y-fe
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31

Marcot, Bonnet Laurence. "Synthèses, études physico-chimiques, photopolymérisation et mesures optiques de métallomésogènes colonnaires hexagonaux." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10112.

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L'elaboration de nouveaux materiaux polymeres pour l'electro-optique utilises par exemple dans les ecrans de television, les cameras, etc a motive ce travail. Dans ce cadre, des complexes derives de ligands de type carboxylate aliphatique et aromatique avec des metaux a sous-couches electroniques pleines (calcium, magnesium, zinc et cadmium) ont ete synthetises. Certains de ces composes possedent, a l'extremite de chaque chaine aliphatique du carboxylate, des fonctions acrylates pour permettre leur polymerisation. L'etude des proprietes mesomorphes de ces metallocarboxylates montre, d'une part
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32

Alqahtany, Faleh. "From water soluble mesogens to liquid crystal gold nanocomposites : synthesis and investigation of flexible chain variation in rod-shaped mesogens." Thesis, University of Hull, 2015. http://hydra.hull.ac.uk/resources/hull:13218.

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A number of new liquid crystalline systems were synthesized and the liquid crystal phase behaviour was investigated. The investigation of the liquid crystal properties involved the characterisation of the neat substances by optical polarizing microscopy (OPM), differential scanning calorimetry (DSC) and for selected samples by x-ray diffraction (XRD) of magnetically aligned sample. The molecular architectures explored are based on a number of rod shaped architectures functionalized with either alkyl groups or ethylenoxy groups, at both ends of the central aromatic core, or at one terminus. The
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33

Schröder, Martin Wolfgang. "Strukturaufklärung und physikalische Charakterisierung flüssigkristalliner Phasen von gebogenen Mesogenen." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=984735682.

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34

Nádasi, Hajnalka. "Bent-core mesogens - substituent effect and phase behavior." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973405104.

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35

Saint, Sandra. "The synthesis and properties of certain heterocyclic mesogens." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263949.

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36

Matharu, Avtar Singh. "Synthesis and properties of some fluorinated biphenyl mesogens." Thesis, Nottingham Trent University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304557.

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37

Brown, J. W. "Synthesis and properties of analogues of biphenyl mesogens." Thesis, Nottingham Trent University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372824.

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38

Stephens, Michael Julian. "The synthesis and characterisation of some novel mesogens." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239664.

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39

O'Donovan, Jacqueline Patricia. "The synthesis and properties of substituted heterocyclic mesogens." Thesis, Kingston University, 1993. http://eprints.kingston.ac.uk/20570/.

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The initial aim of this work was to synthesise novel pyrazine based esters where the pyrazine ring occupies a central position within the ester molecule. Four novel series of pyrazine based esters were prepared. (1) 5-Phenylpyrazin-2-yl 4-n-alkoxyphenylcarboxylates. (2) 5-(4[sup]/-n-Propylphenyl)pyrazin-2-yl trans-4-n-alkylcyclohexylcarboxylates. (3) 5-(4[sup]/-Ethoxy-3[sup]/-fluorophenyl)pyrazin-2-yl 4-n-alkyloxyphenylcarboxylates. (4) 5-(3[sup]/-Fluoro-4[sup]/-methoxyphenyl)pyrazin-2-yl 4-n-alkoxyphenylcarboxylates. Comparison of the liquid crystal properties of the pyrazine based esters wit
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40

Yoo, Seung Uk. "Process-structure-property relationship of a mesogenic bioerodible polyarylate." Thesis, 2003. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2003-066.

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Thesis (M.S.) -- New Jersey Institute of Technology, Committee for the Interdisciplinary Program in Materials Science and Engineering, 2003.<br>Includes bibliographical references. Also available via the World Wide Web.
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41

Cheng, Ching-Yuan, and 鄭景元. "Synthesis and Applications of Dendrons with Peripheral Mesogenic Groups." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/378z9h.

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碩士<br>國立中興大學<br>化學工程學系所<br>101<br>In this work, a mesogenic monomer with smectic C mesophase, 4-(tetradecyloxy)benzoic acid (LC), and its derivative, N-(6-hydroxyhexyl)-4-(tetradecyloxy)benzamide (C6LC), were synthesized. C6LC was then reacted with a building block, the dual-functional 4-isocyanato-4’(3,3-dimethyl-2,4-dioxo-azetidino)diphenylmethane (IDD) and diethyltriamine, to obtain the dendrons with peripheral mesogenic group via the convergent route. These compounds were first structurally characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectrom
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Lin, Chih Hsiung, and 林志雄. "Mesogenic Diol and its Derivatives of Liquid Crystalline Polyu- rethanes." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/11043980238534561166.

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43

Huang, Jia-yu, and 黃嘉瑜. "Mesogenic Properties of Mono, Di, Tri-functionalized Dibenzo[a,c]phenazine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/03327700534487027256.

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碩士<br>國立中山大學<br>化學系研究所<br>94<br>We hope to achieve the goal of improving molecule nature of the liquid crystal by change the functional group or the symmetry of the molecule. In the thesis, the derivatives of dibenzophenazine are synthesized and their mesogenic properties are investigated. Polarised optical microscopy (POM) and differential scanning calorimetry (DSC) studies show all these compounds to exhibit a very wide mesophase range. These mesophases are identified as columnar hexagonal phases by X-ray diffraction (XRD).
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44

Li, Fu-Jung, and 李馥戎. "The liquid crystallinity of symmetric dimers based on the benzoxazole mesogenic unit." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/66276839066386421998.

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碩士<br>國立中央大學<br>化學研究所<br>92<br>Abstract A novel system of symmetric and non-symmetric dimers containing benzoxazole units through ester linkages to the terminal chains have been synthesized and investigated for their thermal behaviour. The mesomorphic behaviour of these compounds was characterised by polarised optical microscopy, differential scanning calorimetry and powder X-ray diffraction. All symmetric dimers linked by a methylene spacer -(CH2)n containing from n = 5 to n = 11 exhibited nematic phase (N) or smectic A phase (SmA). The temperature range of smectic A phase increased with term
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Wu, Yu-Hsuan, and 吳宇軒. "Polyelectrolytes Containing Side Mesogenic Groups and Their Application in Anion Exchange Membranes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/c7rdfk.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>105<br>In this work, anion exchange membranes (AEMs) based on polyelectrolytes bearing pendant mesogenic groups are prepared using poly(4-vinylpyridine)(P4VP) and poly(styrene)-block-poly(4-vinylpyridine)(PS-b-P4VP) as the polymer backbones. The pyridinium cations were produced upon the introduction of bromide-terminated mesogen groups to the P4VP monomer unit. The membrane quality and integrity, as well as the hydroxide transport properties, including swelling ratio, water uptake, ion exchange capacity (IEC), ionic conductivity and alkaline stability were evalua
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Weng, Hsiao-Tun, and 翁筱惇. "Synthesis and Mesogenic Properties of Novel Bent-shaped and Calamitic Liquid Crystals." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/08177663020497976791.

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47

Tien, Kai-Hsin, and 田凱欣. "Synthesis and Characterization of Monomers and Liquid Crystalline Polymers Containing Various Mesogenic Groups." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/03853027242955549147.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>95<br>A series of liquid crystalline monomers with various mesogenic and chiral groups were synthesized and characterized. Homopolymers and copolymers were further synthesized by using liquid crystalline monomers in the presence of 3 wt% free radical initiator. The synthesized monomers, homopolymers and copolymers were identified using FT-IR, 1H-NMR, EA, TGA, UV-vis, DSC, GPC, and XRD. Polymers were identified as nematic, chiral smectic A and cholesteric phase based on the textures observed under POM. Molecular weight of the above polymers ranged from 7,000 to 50,
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48

Chao, Po-Wei, and 趙柏瑋. "New Metallomesogens Based On OxamideScaffold and diimino groups :Synthesis , Characterization and Mesogenic Properties." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6pgrmm.

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碩士<br>淡江大學<br>化學學系碩士班<br>102<br>Three series of molecules are linked by oxamide core, were studied. The synthesis, characterizations and mesogenic properties of these compounds which are 3Cn-ehnom、2Cn-ehnom、1Cn-ehnom is reported.The elemental analysis and spectroscopic (NMR,Mass,PXRD)have been employed to investigate these compounds. The mesogenic behaviors of three series of oxamide-core ligands(3Cn-ehnom、2Cn-ehnom、 1Cn-ehnom, n=16,14,12)were discovered by polarized optical microscope(POM), differential scanning calorimetry(DSC), and powder X-raydiffraction(PXRD) in variable temperature. The
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Kuo, Hsiu-Ming, and 郭修鳴. "The Study of Influence of Hydrogen bonding on Mesogenic Quinoxaline-Schiff Base Derivatives." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/g5h826.

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博士<br>國立中央大學<br>化學學系<br>104<br>In this study, three series of Schiff base and quinoxaline derivatives were synthesized. Different types of rigid spacer were incorporated with Schiff base in order to investigate the spacer effect. Schiff base derivatives 1-4 were synthesized and compounds 1-2 showed long range mesogenic phase as nematic, smectic A and smectic C phases. The corelation between interactions and mesophases of compound 1 (n = 3, 6)and 2 (n = 3) were rationalized by the assistance of single crystal X-ray diffraction data. Crystallographic data indicated that the better mesomorphic pr
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50

Lin, Kuan-Ting, and 林冠廷. "Mesogenic Heterocycles Formed by Quinoxalines, Bis–pyrazoles, and Bis–1, 3, 4–Oxadiazoles." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/u7b64v.

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碩士<br>國立中央大學<br>化學學系<br>103<br>This thesis is devided into four different series. In series 1, two new structures of unsymmetric 1, 3, 4–oxa(thia)–diazoles 1a–b and 2 containing both quinoxaline and naphthalene moieties were prepared and their mesomorphic properties were investigated. The mesomorphic behavior of compounds 1–2 was studied by DSC analysis and polarized optical microscopy. All compounds 1a and 2 exhibited hexagonal columnar phases (Colh), which were also confirmed by powder XRD diffractometer. Ncell and Rar values equal to 5.23 and 22.73 Å within a slice of 9.0 Å thick were also
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