Digitale Medien
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
89 (1988), S. 3317-3322
ISSN:
1089-7690
Quelle:
AIP Digital Archive
Thema:
Physik
,
Chemie und Pharmazie
Notizen:
X-ray diffraction measurements have been made on the nematic phase of T15 (4-cyano-4'-n-pentyl-p-terphenyl), as well as on the nematic and smectic A phases of RNO2 [4'-nitrophenyl-4-(4'-n-hexyloxy-benzoyloxy)-cinnamate]. The x-ray equipment used allows comparably high resolution measurements of liquid crystals. The inner reflexes show that both compounds possess a bilayer structure supposed as overlapping of polar cyano or nitro group of one molecule and the phenyl ring of the neighboring molecule. The molecular orientational distribution function f (β) has been calculated on the basis of intensity simulations of the outer reflexes. The orientational order parameter P2(cos β), P4(cos β), 〈P2〉 and 〈P4〉 have been determined from f (β). A strong decrease of 〈P2〉 and 〈P4〉 is observed at the smectic A–nematic phase transition temperature of RNO2.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.454939
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