Note. The template synthesis and crystal and molecular structure of a seven-co-ordinate manganese(II) complex with 2,6-diacetylpyridine mono(2-aminobenzoylhydrazone)

Abstract

A new seven-co-ordinate manganese(II) complex [Mn(HL)(OH₂)₂Cl]Cl·H₂O has been synthesised with 2,6-diacetylpyridine mono(2-aminobenzoylhydrazone)(HL) by using a template reaction, and characterised by X-ray crystallography. The structure has been solved using direct methods and Fourier-difference techniques and refined by least squares to R 0.0470 for 1 862 observed diffractometer data. The co-ordination around the manganese atom is a pentagonal bipyramid, with a water molecule and a chlorine atom in the axial positions and four donor atoms (two nitrogens and two oxygens) of HL and a second water molecule in the equatorial plane. The molecular packing involves an extensive network of hydrogen bonds.