Structure and properties of protonated N-alkyl-2-aza[3]ferrocenophanes

Treatment of N-alkyl-2-aza[3]ferrocenophanes with HCl and NH4PF6 forms corresponding cationic aza[3]ferrocenophanes having PF6 as a counter anion. These new cationic aza[3]ferrocenophanes cause a slow inversion of stereochemistry at nitrogen atom in solution.