SYNTHESIS AND INVESTIGATIONS OF NEW LIQUID-CRYSTALLINE COMPOUNDS BY COMBINATION OF THE PYRAMIDIC TRIBENZOCYCLONONENE UNIT AND CALAMITIC STRUCTURAL UNITS
Novel liquid crystalline compounds, which consist of five or six calamitic 4-cyanobiphenyl, all-trans-bicyclohexyl or 2-alkyl-5-phenyl-1,3,4-thiadiazole units covalently linked by spacers of different length with a bowl-shaped central core (2,3,7,8,12,13-hexa-substituted 10,15-dihydro-5H-tribenzo[a,...
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| Vydané v: | Perkin transactions. 2 číslo 4; s. 767 - 775 |
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| Hlavní autori: | , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
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CAMBRIDGE
Royal Soc Chemistry
1995
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| ISSN: | 0300-9580 |
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| Abstract | Novel liquid crystalline compounds, which consist of five or six calamitic 4-cyanobiphenyl, all-trans-bicyclohexyl or 2-alkyl-5-phenyl-1,3,4-thiadiazole units covalently linked by spacers of different length with a bowl-shaped central core (2,3,7,8,12,13-hexa-substituted 10,15-dihydro-5H-tribenzo[a,d,g]cyclononene derivatives) have been synthesized and their phase behaviour was investigated by polarizing microscopy, differential scanning calorimetry and X-ray diffraction. Depending on the spacer length, these compounds exhibit either columnar or lamellar (smectic) mesophases. Some of the new compounds form stable monolayers at the air-water-interface. The force-area isotherms of the thiadiazole derivatives have been recorded and it was found that the films consist of densely packed phenylthiadiazole cores with the carboxylate groups at the tribenzocyclononene unit acting as hydrophilic groups. |
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| AbstractList | Novel liquid crystalline compounds, which consist of five or six calamitic 4-cyanobiphenyl, all-trans-bicyclohexyl or 2-alkyl-5-phenyl-1,3,4-thiadiazole units covalently linked by spacers of different length with a bowl-shaped central core (2,3,7,8,12,13-hexa-substituted 10,15-dihydro-5H-tribenzo[a,d,g]cyclononene derivatives) have been synthesized and their phase behaviour was investigated by polarizing microscopy, differential scanning calorimetry and X-ray diffraction. Depending on the spacer length, these compounds exhibit either columnar or lamellar (smectic) mesophases. Some of the new compounds form stable monolayers at the air-water-interface. The force-area isotherms of the thiadiazole derivatives have been recorded and it was found that the films consist of densely packed phenylthiadiazole cores with the carboxylate groups at the tribenzocyclononene unit acting as hydrophilic groups. |
| Author | GORING, P PASCHKE, R DIELE, S BUDIG, H TSCHIERSKE, C SAUER, C |
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| DOI | 10.1039/p29950000767 |
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| References | MENGER, FM (WOS:A1981MG50400067) 1981; 103 EBERT M (WOS:A1995QT26500020.5) 1988; 9 ZIMMERMANN, H (WOS:A1986E382100008) 1986; 41 BUDIG, H (WOS:A1993MJ57000026) 1993; 97 TSCHIERSKE, C (WOS:A1990EY71300027) 1990; 191 KOHNE, B (WOS:A1985AGQ0300001) 1985; 109 DESTRADE, C (WOS:A1984TE57900009) 1984; 106 TSCHIERSKE, C (WOS:A1991FP46600017) 1991; 333 ZIMMERMANN, H (WOS:A1985AEA4900008) 1985; 40 LINDSEY, AS (WOS:A19656270700019) 1965 MALTHETE, J (WOS:A1987L105400057) 1987; 109 MALTHETE, J (WOS:A1993KQ97100001) 1993; 13 CHANDRASEKHAR, S (WOS:A1993LB12600002) 1993; 14 GRAY GW (WOS:A1995QT26500020.6) 1974; 2 BUDIG, H (WOS:A1994PN86900022) 1994 |
| References_xml | – volume: 191 start-page: 223 year: 1990 ident: WOS:A1990EY71300027 article-title: LIQUID-CRYSTALLINE THIADIAZOLE DERIVATIVES .4. NEW LIQUID-CRYSTALLINE MATERIALS WITH BROAD SMECTIC C-RANGES publication-title: MOLECULAR CRYSTALS AND LIQUID CRYSTALS – volume: 14 start-page: 3 year: 1993 ident: WOS:A1993LB12600002 article-title: DISCOTIC LIQUID-CRYSTALS - A BRIEF REVIEW publication-title: LIQUID CRYSTALS – start-page: 1685 year: 1965 ident: WOS:A19656270700019 article-title: STRUCTURE OF CYCLOTRIVERATRYLENE (10,15-DIHYDRO-2,3,7,8,12,13-HEXAMETHOXY-5H-TRIBENZO[A,D,G]CYCLONONENE) AND RELATED COMPOUNDS publication-title: JOURNAL OF THE CHEMICAL SOCIETY – volume: 9 start-page: 45 year: 1988 ident: WOS:A1995QT26500020.5 publication-title: MAKROMOL CHEM – volume: 333 start-page: 135 year: 1991 ident: WOS:A1991FP46600017 article-title: SYNTHESIS OF 1,3,4-THIADIAZOLE DERIVATIVES publication-title: JOURNAL FUR PRAKTISCHE CHEMIE – volume: 41 start-page: 1137 year: 1986 ident: WOS:A1986E382100008 article-title: TEMPERATURE-DEPENDENT SIGN REVERSAL OF THE OPTICAL ANISOTROPY IN PYRAMIDIC MESOPHASES publication-title: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES – volume: 109 start-page: 121 year: 1985 ident: WOS:A1985AGQ0300001 article-title: LIQUID-CRYSTALLINE COMPOUNDS .25. DISCOTIC LIQUID-CRYSTALS - RELATION BETWEEN MOLECULAR-STRUCTURE AND DISCOGENIC PROPERTIES OF DISC-LIKE COMPOUNDS, ESTER OF SCYLLO-INOSITOL, OF CIS-PHLOROGLUCITOL AND OF BETA-D-GLUCOPYRANOSE publication-title: CHEMIKER-ZEITUNG – volume: 103 start-page: 5938 year: 1981 ident: WOS:A1981MG50400067 article-title: HEXAPUS, A NEW COMPLEXING AGENT FOR ORGANIC-MOLECULES publication-title: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY – volume: 109 start-page: 7544 year: 1987 ident: WOS:A1987L105400057 article-title: INVERSION OF THE CYCLOTRIBENZYLENE CONE IN A COLUMNAR MESOPHASE - A POTENTIAL WAY TO FERROELECTRIC MATERIALS publication-title: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY – volume: 40 start-page: 149 year: 1985 ident: WOS:A1985AEA4900008 article-title: PYRAMIDIC MESOPHASES publication-title: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES – start-page: 2359 year: 1994 ident: WOS:A1994PN86900022 article-title: NEW LIQUID-CRYSTALLINE MATERIALS BY COMBINATION OF PYRAMIDIC AND CALAMITIC STRUCTURAL UNITS publication-title: JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS – volume: 106 start-page: 121 year: 1984 ident: WOS:A1984TE57900009 article-title: DISC-LIKE MESOGEN POLYMORPHISM publication-title: MOLECULAR CRYSTALS AND LIQUID CRYSTALS – volume: 97 start-page: 1355 year: 1993 ident: WOS:A1993MJ57000026 article-title: BOWL-SHAPED LIQUID-CRYSTALS - NEW DERIVATIVES OF CYCLOTRIVERATRYLENE AND CALIX[4]ARENE publication-title: BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS – volume: 13 start-page: 171 year: 1993 ident: WOS:A1993KQ97100001 article-title: PHASMIDS AND POLYCATENAR MESOGENS publication-title: LIQUID CRYSTALS – volume: 2 start-page: 617 year: 1974 ident: WOS:A1995QT26500020.6 publication-title: LIQUID CRYSTALS ORDE |
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| Snippet | Novel liquid crystalline compounds, which consist of five or six calamitic 4-cyanobiphenyl, all-trans-bicyclohexyl or 2-alkyl-5-phenyl-1,3,4-thiadiazole units... |
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| Title | SYNTHESIS AND INVESTIGATIONS OF NEW LIQUID-CRYSTALLINE COMPOUNDS BY COMBINATION OF THE PYRAMIDIC TRIBENZOCYCLONONENE UNIT AND CALAMITIC STRUCTURAL UNITS |
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