Synthesis, crystal structures, properties and caries prevention efficiency of 2-, 3-, 4-carboxymethylpyridinium hexafluorosilicates

Add time:07/27/2019    Source:sciencedirect.com

Three pyridinium hexafluorosilicates with the compositions (LH)2[SiF6] (I, II, III, where L = 2-, 3-, 4-carboxymethylpyridine) were obtained as crystalline solids upon interaction of hexafluorosilicic acid with isomeric carboxymethylpyridines. All compounds were characterized by elemental analysis, IR, NMR 19F and mass-spectrometry, solubility data, and X-ray crystallography. The binary ionic solids are stabilized by the interplay of intermolecular interactions including strong charge assisted and conventional hydrogen bonds of the NH⋯F, and OH⋯O types along with CH⋯F contacts and π–π stacking interactions. The different supramolecular motifs in I-III are dictated by the different arrangement of the principal binding sites in the isomeric carboxymethylpyridines. The relationship between the salts structure and solubility data is discussed. All hexafluorosilicates reduce the depth and the number of dental caries, and provide efficiency of caries prevention up to 45%.

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