Crystal structures of [(<i>N</i>,<i>N</i>-dimethylamino)methyl]ferrocene and (<i>R</i> <sub>p</sub>,<i>R</i> <sub>p</sub>)-bis{2-[(dimethylamino)methyl]ferrocenyl}dimethylsilane
Acta crystallographica. Section E, Crystallographic communications