The stability of columns comprising alternating triphenylene and hexaphenyltriphenylene molecules: variations in the structure of the hexaphenyltriphenylene component
Previous investigations of complementary polytopic interaction (CPI) columnar mesophases, in which the columns are built up of alternating hexaalkoxytriphenylene (HAT) and hexaphenyltriphenylene (PTP) molecules, concentrated mainly on the effect of variations in the structure of the HAT component. T...
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Published in | Liquid crystals Vol. 33; no. 6; pp. 653 - 664 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis
01.06.2006
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Abstract | Previous investigations of complementary polytopic interaction (CPI) columnar mesophases, in which the columns are built up of alternating hexaalkoxytriphenylene (HAT) and hexaphenyltriphenylene (PTP) molecules, concentrated mainly on the effect of variations in the structure of the HAT component. This investigation is concerned with the effect of variations in the structure of the PTP component and, in particular, variations in the position of an alkoxy side chain in the phenyl ring. Stable columnar mesophases are obtained when a hexyloxy substituent is placed in the meta- or para-position but not in the ortho-position. In the case of the meta- and para-substituted systems, the two-component CPI columnar phases are stable over a considerably larger temperature range than the one-component HAT systems. The evidence suggests that unfavourable PTP/PTP stacking is as much a driving force for the formation of these mixed stacks as is favourable PTP/HAT stacking, but both need to be explained in terms of the sum of atomically dispersed van der Waals and coulombic interactions. On cooling from the isotropic into the Col
h
phase, the columnar phase based on a 1:1 mixture of hexakis(hexyloxy)tripenylene and the meta-hexyloxy-substituted PTP gives an unusual texture consisting of 'viking-axe'-shaped structures. |
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AbstractList | Previous investigations of complementary polytopic interaction (CPI) columnar mesophases, in which the columns are built up of alternating hexaalkoxytriphenylene (HAT) and hexaphenyltriphenylene (PTP) molecules, concentrated mainly on the effect of variations in the structure of the HAT component. This investigation is concerned with the effect of variations in the structure of the PTP component and, in particular, variations in the position of an alkoxy side chain in the phenyl ring. Stable columnar mesophases are obtained when a hexyloxy substituent is placed in the meta- or para-position but not in the ortho-position. In the case of the meta- and para-substituted systems, the two-component CPI columnar phases are stable over a considerably larger temperature range than the one-component HAT systems. The evidence suggests that unfavourable PTP/PTP stacking is as much a driving force for the formation of these mixed stacks as is favourable PTP/HAT stacking, but both need to be explained in terms of the sum of atomically dispersed van der Waals and coulombic interactions. On cooling from the isotropic into the Col
h
phase, the columnar phase based on a 1:1 mixture of hexakis(hexyloxy)tripenylene and the meta-hexyloxy-substituted PTP gives an unusual texture consisting of 'viking-axe'-shaped structures. |
Author | McLaren, Sholto R. Lydon, John E. Bushby, Richard J. Fisher, Julie Lozman, Owen R. Lange, Stephan |
Author_xml | – sequence: 1 givenname: Richard J. surname: Bushby fullname: Bushby, Richard J. email: R.J.Bushby@leeds.ac.uk organization: Centre for Self-Organising Molecular Systems (SOMS) , University of Leeds – sequence: 2 givenname: Julie surname: Fisher fullname: Fisher, Julie organization: School of Chemistry , University of Leeds – sequence: 3 givenname: Owen R. surname: Lozman fullname: Lozman, Owen R. organization: Centre for Self-Organising Molecular Systems (SOMS) , University of Leeds – sequence: 4 givenname: Stephan surname: Lange fullname: Lange, Stephan organization: Centre for Self-Organising Molecular Systems (SOMS) , University of Leeds – sequence: 5 givenname: John E. surname: Lydon fullname: Lydon, John E. organization: Department of Biochemistry and Molecular Biology , University of Leeds – sequence: 6 givenname: Sholto R. surname: McLaren fullname: McLaren, Sholto R. organization: Centre for Self-Organising Molecular Systems (SOMS) , University of Leeds |
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Cites_doi | 10.1039/b103390p 10.1016/B978-0-12-765601-4.50006-8 10.1039/b417402j 10.1021/ja003443b 10.1039/b311764b 10.1039/a903005k 10.1080/026782901462472 10.1002/1521-3773(20000703)39:13<2333::AID-ANIE2333>3.0.CO;2-V 10.1007/BF00124013 10.1021/ja017499x 10.1021/ja00170a016 10.1007/BF00124473 10.1021/ma0354694 10.1103/PhysRevB.65.245112 10.1002/pol.1955.120178601 10.1080/15421400490435378 10.1080/02678299608031152 |
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Title | The stability of columns comprising alternating triphenylene and hexaphenyltriphenylene molecules: variations in the structure of the hexaphenyltriphenylene component |
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