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Structural Transformations in Crystalline Oligomers of Polyparaphenylene

Published online by Cambridge University Press:  26 February 2011

Kenneth N. Baker ,
Howard C. Knachel ,
Albert V. Fratini  and
W. Wade Adams
Kenneth N. Baker
Affiliation:
Department of Chemistry, University of Dayton, 300 College Park, Dayton, OH 45469
Howard C. Knachel
Affiliation:
Department of Chemistry, University of Dayton, 300 College Park, Dayton, OH 45469
Albert V. Fratini
Affiliation:
Department of Chemistry, University of Dayton, 300 College Park, Dayton, OH 45469
W. Wade Adams
Affiliation:
Materials Laboratory, Wright Research and Development Center, WPAFB, OH 45433-6533
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Abstract

We report the room and low temperature crystal structures of the unsubstituted pquinquephenyl (PQP) and p-sexiphenyl (PSP), and substituted 22,45 -diphenyl-pquinquephenyl (DPQP), 22,65-diphenyl-p-septiphenyl (DPSP), and 1,2,4-triphenylbenzene (TPB) polyparaphenylene oligomers. The unsubstituted oligomers exhibit a solid state transition when cooled from room temperature to 110K, as indicated by a change in crystallographic space group. No transition is observed for the substituted oligomers other than the usual thermal contraction of the unit cell. The transition observed for the unsubstituted oligomers is interpreted in terms of a conformational change from an “averaged” planar structure to a static non-planar one. Comparisons of room temperature and low temperature crystal data are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 497
Copyright
Copyright © Materials Research Society 1989

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References

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