2. Academic Validation
  3. Two polymorphic forms of the oxathiin systemic fungicide active carboxine

Two polymorphic forms of the oxathiin systemic fungicide active carboxine

  • Acta Crystallogr E Crystallogr Commun. 2018 Nov 9;74(Pt 12):1741-1745. doi: 10.1107/S2056989018015451.
Christopher S Frampton 1,  Eleanor S Frampton 2,  Paul A Thomson 3
Affiliations

Affiliations

  • 1 Experimental Techniques Centre, Brunel University London, Kingston Lane, Uxbridge UB8 3PH, England.
  • 2 University of Nottingham, University Park, Clifton Blvd, Nottingham NG7 2RD, England.
  • 3 Vive Crop Protection, 6275 Northam Drive, Unit 1, Mississauga, ON L4V 1Y8, Canada.
PMID: 30574366 DOI: 10.1107/S2056989018015451
Abstract

Two polymorphic crystal forms of the title compound, C12H13NO2S (systematic name: 6-methyl-N-phenyl-2,3-di-hydro-1,4-oxathiine-5-carboxamide), were isolated from a truncated, (12 solvent), polymorph screen on pure lyophillized material. Crystals of form 1 were obtained from all solvents included in the screen with the exception of methanol. As isolated from aceto-nitrile the crystals are triclinic, space group P with Z' = 2. Crystals of form 2, which were isolated from methanol only are monoclinic, space group I2/a with Z' = 1. The crystal packing in both structures is dominated by the formation of infinite -NH⋯O hydrogen-bonded chains through the carboxamide core.

Keywords

carboxin; carboxine; crystal structure; fungicide; hydrogen bonding; polymorphism.

Figures
Products