A crystal chemical study has allowed us to identify new phosphate. Single crystals of Cs2CuP2O7 have been prepared by high-temperature solid-state reactions. Mixture of CsNO3, CuSO4x5H2O and (NH4)4(P2O7) taken in stoichiometric proportion 3:1:1 was grounded and loaded into a corun-dum crucible. The crystal structure of Cs2CuP2O7 (monoclinic, Cc, a = 7.460(6), b = 12.973(10), c = 9.980(8) Å, β = 111.95(2)°, V = 895.8(12) Å3) prepared by solid-state reactions is based upon open framework formed by corner sharing between CuO4 distorted squares and P2O7 groups.
Keywords: crystal chemistry, crystal structure, mixed anion radicals, high-temperature synthesis, open framework structure; diamond net