Ch. Park et K. Bluhm, SYNTHESIS AND CRYSTAL-STRUCTURE OF TRILEA D-DIPHOSPHATO-BORATE-PHOSPHATE, A COMPOUND WITH A (1)(INFINITY)[(PO4)(2)BPO4](6-)-ANION, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 50(11), 1995, pp. 1617-1622
Single crystals of Pb-3[(PO4)(2)BPO4] were obtained by melting B2O3, P
2O5 and PbO at 960 degrees C. The structure is related to the Ba-3[(PO
4)(2)BPO4] type X-ray investigations on single crystals led to the spa
ce group Pbca-D-2h(15) (Nr. 61) with a = 694.6(1), b = 1419.9(3), c =
2111.6(2) pm, Z = 8. Boron and phosphorus are tetrahedrally coordinate
d by oxygen. The polyhedra form one-dimensional infinite helices that
contain two additional PQ(4) groups connected to the BO4-unit. Lead is
eightfold coordinated by oxygen. The relation to the crystal structur
e of Ba-3[(PO4)(2)BPO4] is discussed.