THERMAL, SPECTRAL AND MAGNETIC STUDIES ON 4-HYDROXYPTERIDINE COMPOUNDS OF MANGANESE(II), COBALT(II), NICKEL(II) AND COPPER(II)

The chloro compounds of 4-hydroxypteridine with manganese, cobalt, nickel and copper were prepared in ethanolic solution, from which the solid compounds were isolated. The suggested structure for the cobalt compound is tetrahedral, while for the manganese, nickel and copper compounds it is octahedral. The thermal behaviour of these compounds has been studied by thermogravimetry and differential thermal analysis techniques. The compounds of cobalt and nickel are hydrated. Thermal decomposition studies show that these compounds lose water of crystallisation followed by organic ligand to give the metal oxide. The compounds of manganese and copper are anhydrous. Thermal decomposition studies show that these compounds lose organic ligand to form the metal oxide. © 1990.