Synthesis, crystal structures and ab initio studies of some heptaaza manganese(II) macrocyclic Schiff-base complexes with two 2-aminoethyl pendant arms

Two new heptaaza Mn(II) macrocyclic bis(pendant donor) Schiff-base complexes, [MnL6]2+ and [MnL7]2, have been prepared via the Mn(II) templated [1 + 1] condensation of 2,6-diacetylpyridine with branched hexaamines. The crystal structure of [MnL7]2+ and another related complex, [MnL5]2+ were determined from X-ray diffraction.