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Raman Spectroscopic and Calorimetric Investigation of the Multiple Smectic Phase Material TBBA

  • J. M. Schnur
  • J. P. Sheridan

Abstract

Smectic mesophase formation and structure have been the subject of vigorous scientific inquiry in recent years. 1–6 Among those phases investigated most intensively, the B and H phases are thought to possess the highest degree of local three-dimensional order. As determined by X-ray crystallography 1–5 both phases exhibit long-range two dimensional pseudo-hexagonal order within each layer; in addition there appears to be some degree of correlation between planes.1,5 In the H phase the director lies at an angle to the smectic planes, while in the B phase it is normal to the planes. The nature of the degrees of freedom available and the intermolecular ordering in these phases has been the subject of a number of theoretical and experimental studies.3,7,8 Since terephthal-bis-butylaniline (TBBA) exhibits a smectic H phase as well as at least eight other phases (see schematic below), it has been extensively studied by various experimental techniques including X-ray,4 NMR,9 DSC,10 neutron scattering,11 infrared12 and Raman10,13–14 spectroscopy. This paper provides new information on the nature of the various smectic phases observed in TBBA.

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Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • J. M. Schnur
    • 1
  • J. P. Sheridan
    • 1
  1. 1.Naval Research LaboratoryUSA

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