Abstract
A series of Mn(II) macrocyclic Schiff-base complexes [MnL n ] 2+ have been prepared via the Mn(II) templated [1+1] cyclocondensation of 2,9-dicarboxaldehyde-1,10-phenanthroline with appropriate linear and branched amines. In this way ligands the pentaaza macrocycle L 1 which is 15-membered and L 2 which is 16-membered possessing no pendant arm, L 6 is 15-membered with one 2-aminoethyl pendant arm and L 8 which is 18-membered hexaaza macrocycle with two 2-aminoethyl pendant arms are formed. All the complexes have been characterized using spectroscopic methods. The crystal structures of [MnL 8](ClO 4) 2 · EtOH were determined and indicate that in the solid state the complex adopts a slightly distorted hexagonal bipyramid geometry with the Mn(II) ion located within a hexaaza macrocycle with the two pendant amines coordinating in the axial positions.
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