Chemical preparation, kinetics of thermal behavior and infrared studies of Pb3(P3O9)2.3H2O and Cd3(P3O9)2.14H2O

Abstract

Chemical preparation, thermal behavior, kinetic and IR studies are given for the cyclotriphosphates

Engineering Techniques applied for studies by Infrared vibration, crystallographic characterization and Thermal Behavior of two new cyclotriphosphates

“…The dehydration of hydrated cyclotriphosphates leads in some cases to their corresponding anhydrous compounds. This possibility exists in our case because the title compound is a new one and this thermal study permits us to identify the intermediate and final phases of the dehydration and decomposition under the effect of temperature for MnCa 2 The cyclotriphosphate decahydrate of manganese and dicalcium, MnCa 2 (P 3 O 9 ) 2 .10H 2 O was prepared by using nitrates of manganese and calcium. To an aqueous solution of anhydrous sodium cyclotriphosphate (3.059g of Na 3 P 3 O 9 in 60 ml of distilled water) is added in stoichiometric quantities and with mechanical stirring, a mixture in aqueous solution containing calcium nitrate tetrahydrate (2.362 g of Ca(NO 3 ) 2 .4H 2 O), the manganese nitrate tetrahydrate (1.255 g of Mn(NO 3 ) 2 .4H 2 O) and 60 ml of distilled water The mixture of the aqueous solution of nitrates has a pink color.…”

“…In the first case, a well crystallized product is obtained, but it is not possible to grow monocrystals of a suitable size for a structural study. In the second case, after a 2 We have prepared the anhydrous cyclotriphosphate of manganese and dicalcium, MnCa 2 (P 3 O 9 ) 2 , directly by the method of THILO et al [1] in the dry form powder. The diammonium mono hydrogenomonophosphate, (NH 4 ) 2 HPO 4 , in excess and the calcium and manganese carbonates respectively CaCO 3 and MnCO 3 are intimately ground and heated at 500°C, under atmospheric pressure, in a porcelain crucible, according to the following chemical reaction:…”