A comparison of mesogenic properties for one- and two-ring dipentyl derivatives of p-carboranes, bicyclo[2.2.2]octane, and benzene

Journal Article (Journal Article)

A series of nonpolar single- and two-ring dipentyl derivatives of p-carboranes, bicyclo[2.2.2]-octane and benzene was investigated in the pure state and in binary mixtures with a nematic host. The resulting virtual nematic-isotropic transition temperatures [T ] for single ring compounds were compared with those for two ring compounds. All [T ] were compared with the molecular aspect ratios X and filling fractions F obtained from MNDO calculations. The highest effectiveness in promotion of the nematic phase was found for bicyclo[2.2.2]octane and 12-vertex p-carborane and ascribed to exceptional molecular rigidity and electronic properties, respectively. Results show that a high filling fraction F and molecular stiffness are the necessary factors for a highly stable nematic phase. NI NI

Full Text

Duke Authors

Cited Authors

  • Piecek, W; Kaufman, JM; Kaszynski, P

Published Date

  • January 1, 2003

Published In

Volume / Issue

  • 30 / 1

Start / End Page

  • 39 - 48

International Standard Serial Number (ISSN)

  • 0267-8292

Digital Object Identifier (DOI)

  • 10.1080/0267829021000039669

Citation Source

  • Scopus