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Crystal structures of poly-paraphenylene oligomers containing pendant phenyl groups

The room temperature crystal structures of 1,2,4-triphenylbenzene (TPB), C 24H 18; 2 2,4 5-diphenyl- p-quinquephenyl (DPQ), C 42H 30; and 2 2,6 5-diphenyl- p-septiphenyl (DPS), C 54H 38, have been investigated as part of a research programme in rigid-rod polymers, materials which are of great intere...

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Bibliographic Details
Published in:Polymer (Guilford) 1990-09, Vol.31 (9), p.1623-1631
Main Authors: Baker, Kenneth N., Fratini, Albert V., Adams, W.Wade
Format: Article
Language:English
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Summary:The room temperature crystal structures of 1,2,4-triphenylbenzene (TPB), C 24H 18; 2 2,4 5-diphenyl- p-quinquephenyl (DPQ), C 42H 30; and 2 2,6 5-diphenyl- p-septiphenyl (DPS), C 54H 38, have been investigated as part of a research programme in rigid-rod polymers, materials which are of great interest for aerospace and electro-optical applications. The molecules are non-planar, in contrast to the planar structures found at room temperature for the unsubstituted polyphenyls. The oligomer axis does not align with any of the crystallographic axes. The pendant-oligomer bond, however, does align with the longest crystallographic axis. The pendant torsion angle is greater than 45° and increases with increasing chain length. Knowledge of molecular structure and crystal packing of oligomeric model compounds will be useful in further calculations of mechanical, optical, and electro-optical properties for the corresponding rigid-rod polymer structures.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(90)90178-2