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Alkynyl and isocyanobiphenyls : new thermotropic liquid crystals Bailey, Austin Lou
Abstract
The presence of mesomorphism in 4-n-alkyl-4'-isocyanobiphenyls 4 and 4-n-alkyl-4'-alkynylbiphenyls 5 was investigated, based on the liquid-crystallinity of the cyanobiphenyls 2 (R = n-alkyl). Compound 4 (R = n-butyl) is non-mesomorphic, whereas 4 (R = n-pentyl) is a virtual liquid crystal melting at 34-35°C and supercooling to a nematic phase at 30°C, and 4 (R = n-hexyI) is a nematic liquid crystal from 9 to 19°C. Compounds of structure 5 (R = n-pentyl, X = Si(CH₃)₃, H, CH₃, CI) are not liquid crystals. The corresponding bromo- and iodoalkynes (5, R = n-pentyl, X = Br, I) are liquid crystals with mesomorphic ranges of 88-108°C and 110-119°C, respectively. [See Thesis for Diagram]
Item Metadata
Title |
Alkynyl and isocyanobiphenyls : new thermotropic liquid crystals
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1989
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Description |
The presence of mesomorphism in 4-n-alkyl-4'-isocyanobiphenyls 4 and 4-n-alkyl-4'-alkynylbiphenyls 5 was investigated, based on the liquid-crystallinity of the cyanobiphenyls 2 (R = n-alkyl). Compound 4 (R = n-butyl) is non-mesomorphic, whereas 4 (R = n-pentyl) is a virtual liquid crystal melting at 34-35°C and supercooling to a nematic phase at 30°C, and 4 (R = n-hexyI) is a nematic liquid crystal from 9 to 19°C. Compounds of structure 5 (R = n-pentyl, X = Si(CH₃)₃, H, CH₃, CI) are not liquid crystals. The corresponding bromo- and iodoalkynes (5, R = n-pentyl, X = Br, I) are liquid crystals with mesomorphic ranges of 88-108°C and 110-119°C, respectively. [See Thesis for Diagram]
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-08-14
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0060432
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.