| Abstract: | Preparation and crystal structure of an acidic polyphosphate of calcium is described. CaH2(PO3)4: monoclinic, P21/c, with Z = 2, and a = 5.686(1), b = 9.676(4), c = 8,844(3) Å, β = 92.35(2)°. The crystal structure was solved using 2 321 unique reflections with a final R value of 0.017. The compound is characterized by infinite (PO3)n chains running along c and linked together in a three-dimensional way by Ca? O and hydrogen bonds. The two-dimensional linkage of the phosphoric chains by hydrogen bonds is compared to those already observed in ErH(PO3)4 and BiH(PO3)4. |
