CS2H2P2O7.TE(OH)6, A NEW ADDUCT BETWEEN A DIPHOSPHATE AND TELLURIC ACID

We describe chemical preparation and crystal structure of an adduct be tween cesium dihydrogen-diphosphate and telluric acid. CS2H2P2O7.Te(OH )6 is monoclinic C2/c, with Z = 8 and the following unit-cell dimensio ns: a = 20.518(7), b = 8.372(3), c = 16.652(6) angstrom, beta = 106.55 (3)degrees. As usual in this type of adduct, the phosphoric anion and the Te(OH)6 groups coexist as independent units in the atomic arrangem ent. The acidic diphosphoric anions are interconnected in a three-dime nsional way by a strong network of hydrogen bonds building large oblon g channels, in which are located rows of alternating Te(OH)6 groups an d cesium atoms. The final R value is 0.033 for 5181 independent reflec tions.