Synthesis, crystal structures and magnetic studies on the nickel(II) and manganese(II) complexes containing the 2-pyridyl methyl ketazine

Two double helical compounds with a general cationic structure [MII2(L1)2(Cl)3]+ have been obtained by treatment of L1 (L1 = 2-pyridyl methyl ketazine) and hydrated MIICl2 in MeOH, which were isolated as a PF6- salt (Mdouble bond; length as m-dashNi, 1) and a ClO4− salt (Mdouble bond; length as m-dashMn, 2), respectively. They represent first examples of double helicates of diazine complexes containing pseudo octahedral-coordinated metal ions. Their crystal structures have been determined by X-ray crystallography and the corresponding magnetic properties have been investigated in detail.