Structural researches on metal complexes of polydentate ligands containing carbonyl and α-diimine moieties,part V. Heptacoordination in a manganese(II) complex of 2,6-diacetylpyridinebis(picolinoylhydrazone)

Summary The MnCl₂ (H₂ DIP) · 5H₂O complex H₂DIP = 2,6-diacetyl-pyridinebis(picolinoylhydrazone)] has been synthesized and examined by i.r.-spectroscopy and x-ray diffractometry. Crystals are triclinic (P ) with unit-cell dimensions: = 15.00(1),b= 13.65(1),c = 7.565(6) Å, = 92.4(1), = 97.5(1), = 117.5(1)°; Z = 2. The structure was solved from 1788 independent diffractometer data by direct methods and refined anisotropically by block-diagonal leastsquares calculations toR = 5.4%. The manganese ion has a distorted pentagonal-bipyramidal geometry, in which the organic molecule acts as a pentadentate ligand. A disordered distribution involving chlorine ions and water molecules is present.Part. IV. Ref. 2.