Crystal structure determination of two pyridine derivatives: 4-[(<i>E</i>)-2-(4-methoxyphenyl)ethenyl]-1-methylpyridin-1-ium hexafluoro-λ<sup>6</sup>-phosphane and 4-[(<i>E</i>)-2-[4-(dimethylamino)phenyl]ethenyl]-1-phenyl-1λ<sup>5</sup>-pyridin-1-ylium hexafluoro-λ<sup>6</sup>-phosphane
Acta crystallographica. Section E, Crystallographic communications