NAZNPO4-CENTER-DOT-H2O, AN OPEN-FRAMEWORK SODIUM ZINCOPHOSPHATE WITH A NEW CHIRAL TETRAHEDRAL FRAMEWORK TOPOLOGY

Two approaches to the synthesis and structure determination of NaZnPO4 . H2O, a new open-framework, chiral, hydrated sodium zincophosphate p hase, are reported. The ordered, alternating, vertex-sharing ZnO4 and PO4 groups in NaZnPO4 . H2O form a new framework topology, which inclu des novel 4-ring ''squares'' and edge-sharing helixes of 4-rings. The disordered extra-framework species (Na+, H2O) are located in pear-shap ed cavities (12-ring diameter), interconnected through 8-rings and 6-r ings. Crystal data: NaZnPO4 . H2O (I), M(r) = 201.36 hexagonal, space group P6(1)22 (No. 178), a = 10.4797(8) Angstrom, c = 15.089(2) Angstr om, V = 1435 Angstrom(3), Z = 12, R = 5.99%, R(w) = 5.29% (709 observe d reflections with I > 3 sigma(I). NaZnPO4 . H2O (II), M(r) = 201.36,h exagonal, space group P6(5)22 (No. 179), a = 10.412(2) Angstrom, c = 1 5.184(2) Angstrom, V = 1426 Angstrom(3), Z = 12, R = 6.90%, R(w) = 8.1 0% (687 observed reflections with I > 4 sigma(I).