Abstract
Alkaline earth cyclo-tetra- μ -imido-tetraphosphate has been prepared by adding aqueous alkaline earth chloride into a mixture of cyclo-tetra-μ-imido- tetraphosphoric acid and ammonia solution. When the alkaline earth cyclo-tetra-μ-imido-tetraphosphate was heated, release of the water of crystallization was observed and a small decomposition of the imidophosphate occurred up to 210°C. The imidophosphate decomposed to produce many kinds of condensed phosphates with or without NH and NH2 groups at a higher temperature. The sample finally changed to alkaline earth metaphosphate.
