The nature and properties of manganese violet

Abstract

A new method for the preparation of manganese violet is reported and the formula confirmed as manganese(III) ammonium pyrophosphate by wet analysis, X-ray powder diffraction, infrared spectroscopy, thin-layer chromatography, and magnetic measurements. The thermal decomposition has been studied and thermogravimetric curves obtained. Using the above techniques, the products have been identified as either manganese(II) trimetaphosphate, or a mixture of manganese(II) tri- and tetra-metaphosphates depending on the temperature and duration of heating.