Topochemical studies. XIII. Structures of 3-bromocinnamic acid and 3-chlorocinnamic acid

Polymorphic Phase Transformation in the 3-Bromo-trans-cinnamic Acid System

“…In this paper, we investigate phase transformations between the polymorphs of 3-BrCA using powder X-ray di!raction, optical microscopy, and di!erential scanning calorimetry. With regard to structural properties, the lattice parameters and space groups of both polymorphs have been reported previously (6,9) and the crystal structure of the phase has been determined previously (9). However, the crystal structure of the phase has not been determined previously, and is reported in this paper.…”

“…In the present work, the crystal structure of the phase of 3-BrCA has been determined from single-crystal X-ray di!raction data recorded at ambient temperature. The crystal structure of the phase of 3-BrCA has been determined previously (9). (7) 0.422 (7) 1.491 (23) 1.039(6) 0.13(3) Note.…”

Topochemical studies. XIV. Structures of 3,3'-dibromotruxinic acid water–acetic acid (0.5/0.25) solvate and 3,3'-dichlorotruxinic acid water–acetic acid (0.5/0.25) solvate

“…In the preceding work, the crystal structures of 3-bromocinnamic acid (3) and 3-chlorocinnamic acid (4) have been clarified (Kanao, Kashino & Haisa, 1990). In the present paper we report the structures of the photodimers [(1), bromo compound, and (2), chloro compound] formed topochemically from (3) and (4).…”

“…The photodimers were prepared by exposing crystals of (3) and (4) to sunlight for two weeks, and isolated by extracting (3) and (4) Kanao, Kashino & Haisa (1990). t To whom correspondence should be addressed.…”

Polymorphic phase transformations of 3-chloro-trans-cinnamic acid and its solid solution with 3-bromo-trans-cinnamic acid

“…In this article, we focus on 3-chloro-trans-cinnamic acid (3-ClCA) and 3-bromo-trans-cinnamic acid (3-BrCA). For ISSN 2053ISSN -2296 # 2018 International Union of Crystallography pure 3-ClCA, two polymorphs are known, corresponding to -type (Kanao et al, 1990) and -type (Kariuki et al, 1996) structures. For pure 3-BrCA, two polymorphs are also known, again corresponding to -type (Kanao et al, 1990) and -type (Ahn et al, 2001) structures.…”