Abstract
Trimetaphosphimates are both molecular model systems for oxonitridophosphates and oxonitridic glasses as well as precursors for their syntheses. The decomposition of both K3(PO2NH)3 and Ag3(PO2NH)3 afford amorphous products. Analysis of the atomic displacement parameter as a function of the temperature revealed a higher increase just before decomposition, especially with respect to stretching vibrations. This is more pronounced for the P3N3 ring in Ag3(PO2NH)3, indicating that the ring is predetermined for decomposition, whereas there are no conspicuous sites in the potassium compound. Libration corrections for trimetaphosphimate anions result in rather small changes of bond lengths, most pronounced for P–O bonds at high temperatures.
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