X-Ray Scattering Study of Restacking Transitions in the Crystalline-B Phases of Heptyloxybenzylidene Heptylaniline (7O.7)

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X-Ray Scattering Study of Restacking Transitions in the Crystalline-B Phases of Heptyloxybenzylidene Heptylaniline (7O.7)

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Title: X-Ray Scattering Study of Restacking Transitions in the Crystalline-B Phases of Heptyloxybenzylidene Heptylaniline (7O.7)
Author: Collett, Jeffrey; Sorensen, L. B.; Pershan, Peter S.; Als-Nielsen, J.

Note: Order does not necessarily reflect citation order of authors.

Citation: Collett, Jeffrey, L. B. Sorensen, Peter S. Pershan, and J. Als-Nielsen. 1985. X-ray scattering study of restacking transitions in the crystalline-B phases of heptyloxybenzylidene heptylaniline (7O.7). Physical Review A 32(2): 1036-1043.
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Abstract: This paper reports a comprehensive x-ray diffraction study of the structure and the restacking transitions which occur within the crystalline-B phases of N-[4-(n-heptyl)oxybenzylidene]-4’-(n-heptyl)aniline (7O.7). Between \(63^{\circ}C\) and \(59^{\circ}C\), this system exhibits a rich structural behavior with a series of three transitions involving restacking and subtle changes in the intralayer packing. In order of decreasing temperature, the structures are hexagonal close packed \((69–63^{\circ}C)\), orthorhombic F \((63–60.1^{\circ}C)\), monoclinic C \((60.1–59.75^{\circ}C)\), and simple hexagonal \((59.75–55^{\circ}C)\). In the last three phases, there is also a long-wavelength modulation \((\lambda \sim 100\mathring{A})\) in which the smectic layers are displaced along their normals. The wave vector of the modulation lies in the plane of the smectic layers directed along a reciprocal-lattice vector and exhibits a weak \((\sim 20%)\) temperature variation. Both low-resolution (rotating-anode) and high-resolution (synchrotron) measurements of the structures and of the diffuse scattering are reported.
Published Version: doi:10.1103/PhysRevA.32.1036
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Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10357690
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