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In the solid state, a characteristic reaction is observed on heating of ground mixtures of 1-methyl-4-oxo-cis-2,6-diphenylthianium tetrafluoroborate (1) and alkali halides. These reactions occurred via ion exchange.These reaction products were 4-oxo-cis-2,6-diphenylthiane (6) and 5-(methylthio)-1,5-diphenyl-(E)-1-penten-s-trans-3-one (3) in KC1, mainly dibenzalacetone (4) in KBr, 1,5-bis(methylthio)-1,5-diphenylpentan-3-one (5), 3, 4, and 6 in KI, 3, 4, and 6 in NaCI, respectively, and different from those at room temperature. Moreover, the existence of three crystal forms (form I, II and III) and an amorphous form of 1 was confirmed by powder X-ray diffraction.Polymorphic transformations caused by heating, standing and by mechanical treatment such as grinding.In the solid-state reaction, grinding of mixture occurs the interaction such as adsorption.Moreover, thermal solid-state reaction by differential thermal analysis was affected by the grinding times and amount of alkali halide.

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