Zinc complexes of 6-methyl-2-pyridinecarboxylic acid. Crystal structure of [Zn(MeC5H3NCOO)2(H2O)] · H2O

Reaction of Zn(AcO)2 · 2H2O with 6-methyl-2-pyridinecarboxylic acid (L) yielded a new compound [Zn(MeC5H3NCOO)2(H2O)] · H2O. This complex was characterised by elemental analyses, conductivity measurements, infrared, 1H and 13C{1H} NMR spectroscopies and single-crystal X-ray diffraction. The crystal structure consists of discrete molecules involving a pentacoordinated Zn atom with a geometry intermediate between a trigonal bipyramid and a square pyramid and with the two Npy atoms occupying the apical sites. Treatment of the complex [Zn(MeC5H3NCOO)2(H2O)] · H2O with 2,2′-bipyridine (bpy) produced [Zn(MeC5H3NCOO)2(bpy)]. The metallic atom in this complex displays a distorted octahedral geometry and is coordinated to two ligands (L) via the pyridine nitrogen and the carbonyl oxygen atoms and to one 2,2′-bypyridine (bpy).