SYNTHESIS AND STRUCTURAL INVESTIGATION OF A NEW CYCLOHEXAPHOSPHATE - ZNNA4P6O18-CENTER-DOT-6H(2)O

We report chemical preparation and crystal structure of the first comp ound, ZnNa4P6O18.6H(2)O, of a new M(II)M(I)(4)P6O18.nH(2)O cyclohexaph osphate family. This mixed salt is triclinic, with Z=1 and the followi ng unit cell parameters : a = 9.284(5), b = 9.127(5), c = 7.418(3) Ang strom, alpha = 72.13(5), beta = 105.34(5), gamma = 115.67(5)degrees Sp ace groupe is <P(1)over bar>. In this arrangement P6O18 rings, ZnO6 oc tahedra and Na(1)O-6, Na(2)O-5 polyhedra form two kinds of ribbons, sp reading in different directions, in order to assure the three-dimensio nal network cohesion. Crystal structure was solved by using 4811 refle ctions, with a final R = 0.039. The hydrogen -bond scheme is described .