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X‐ray studies of the self‐organized structure formed by 1,2‐bis(4'‐ n ‐alkoxybenzoyl)hydrazine (BABH‐ n ) homologues. 1. Ia 3 d ‐gyroid structure
Author(s) -
Kutsumizu Shoichi,
Mori Hiroyuki,
Fukatami Machiko,
Saito Kazuya
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889807011958
Subject(s) - thermotropic crystal , mesogen , gyroid , crystallography , chemistry , phase diagram , phase (matter) , small angle x ray scattering , scattering , copolymer , optics , physics , liquid crystalline , organic chemistry , polymer
The cubic (Cub) phase structure of a thermotropic mesogen 1,2‐bis(4′‐ n ‐alkoxybenzoyl)hydrazine (BABH‐ n , where n is the number of C atoms in the aliphatic tail) was examined by small‐angle X‐ray scattering. The BABH‐ n system exhibits two types of Cub phases, Ia 3 d type and Im 3 m type. In the phase diagram as a function of the tail length ( n ) the Im 3 m ‐Cub phase region ( n = 13–16) was sandwiched by two Ia 3 d ‐Cub phase regions with n < 13 and n > 16. On the basis of the triply periodic minimal surface (TPMS) picture, the Ia 3 d and Im 3 m structures are described by the gyroid (G) and doubled‐P (PP) surfaces, respectively. In this paper we focused attention on the internal structure of the Ia 3 d ‐Cub phase at the molecular level. By examining how the relative intensity of the 220 reflection with respect to the 211 reference peak varies with n , we have successfully determined the position of the aliphatic tails, which are located on the G‐TPMSs. As far as we know, this is the first approach to clarifying the internal structure of the thermotropic Ia 3 d ‐Cub phase. The usefulness of the systematic studies with respect to the tail length n has also been demonstrated.