Polymeric coordination compounds derived from transition metal(II) with tetradentate Schiff-base: Synthetic, spectroscopic, magnetic and thermal approach

The polymeric coordination compounds have been synthesized using the dipotassium salt of N,N'-di(carboxymethylene)terephthalaldehydediimine (K2SB1) or N,N'-di(carboxyethylene)terephthalaldehydediimine (K2SB2) With manganese(II), cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II). The ligands have been characterized by H-1-NMR, and C-13-NMR spectra. The polychelates have been characterized by elemental analyses, magnetic measurements, thermogravimetric analyses, electronic spectra and infrared spectra. The coordination compounds are colored, and the central metal ions are octahedrally coordinated with two water molecules and the Schiff bases. The Schiff bases act as di-negative tetradentate ligands, in which bonding occurs through two oxygen and two nitrogen atoms. The polymers are insoluble in all common organic solvents such as acetone, methanol, ethanol, N,N-dimethylformamide and dimethylsulfoxide.