Structure of mesogens possessing B7 textures: The case of the bent-core mesogen 8-OPIMB-NO{sub 2}

• Published in: Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics Vol. 72; no. 4
• Main Authors: Folcia, C.L., Etxebarria, J., Ortega, J., Ros, M.B., Departamento de Fisica Aplicada II, Facultad de Ciencias, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao, Departamento de Quimica Organica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza
• Format: Journal Article
• Language: English
• Published: United States 01-10-2005
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HARMONIC GENERATION; LIQUID CRYSTALS; MOLECULES; NITROGEN DIOXIDE; ORGANIC COMPOUNDS; STRUCTURAL MODELS; TEXTURE; TWO-DIMENSIONAL CALCULATIONS; X RADIATION
• ISSN: 1063-651X; 1095-3787
• DOI: 10.1103/PhysRevE.72.041709

A structural investigation of the compound 8-OPIMB-NO{sub 2} is carried out. This material is a mesogen formed by bent-core molecules where the so-called B7 phase was originally proposed. X-ray data are successfully indexed in terms of a oblique two-dimensional lattice. Using additional information from optical second harmonic generation several possible structural models are proposed. The models are based on molecular packing considerations. All these structures are clearly different from those of other materials previously classified as B7. The necessity of a revised nomenclature for classifying the structures of these compounds is pointed out.