title: Preparation and characterization of methyl green tetrafluoroborate.
abstract: Commercial methyl green dyes were converted to tetrafluoroborate by means of NaBF4-solution, the compounds thus obtained were analytically pure. It was shown to be possible to distinguish between a "methyl" and an "ethyl" compound by means of NMR spectroscopy. The dyes are stable in buffered aqueous solution, and in crystalline form. A spectrophotometric assay is proposed.
mesh_terms: D001881:Borates / Q000032:analysis / Q000138:chemical synthesis; D002021:Buffers; D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D008739:Methyl Green / Q000032:analysis / Q000138:chemical synthesis; D012394:Rosaniline Dyes / Q000032:analysis / Q000138:chemical synthesis; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared
chemical_list: D001881:Borates; D002021:Buffers; D012394:Rosaniline Dyes; D008739:Methyl Green