STRUCTURAL INVESTIGATION OF A NEW SERIES OF LONG-CHAIN POLYPHOSPHATES - CRYSTAL-STRUCTURE OF AGK(PO3)2 AND CRYSTAL DATA FOR AGM(PO3)2 WITH M = K, RB, CS, AND TL

Single crystals of four isotypic AgM(PO3)2 compounds (M = K, Rb, Cs, and TI) have been prepared by flux methods. Crystal structure determination, performed with the silver-potassium salt, shows these four compounds are long-chain polyphosphates. AgK(PO3)2 is monoclinic, P21/a, with Z = 4 and the following unit cell dimensions: a = 7.490(6), b = 13.175(10), c = 6.037(5) Å, β = 94.32(6)°. The final R value is 0.031 for 1887 independent reflections. Infinite (PO3)n chains are directed along the a direction with a period of four tetrahedra, while associated cations form very corrugated layers waving between the phosphoric chains. © 1993 Academic Press. All rights reserved.