THE SYNTHESIS AND CHARACTERIZATION OF A ONE-DIMENSIONAL ALUMINOPHOSPHATE - NA4AL(PO4)(2)(OH)

Na4Ar(PO4)(2)(OH) (orthorhombic, Pbcm, a = 15.279(3) Angstrom, b = 14.660(3) Angstrom, c = 6.9470(10) Angstrom, V = 1556.1(5) Angstrom(3), and Z = 4) was prepared hydrothermally in a steel autoclave at 473 K. The structure was solved using room-temperature single-crystal X-ray diffraction data from 1544 observed reflections (I > 4 sigma(I)), R(F-2) = 6.27%, R(W)(F-2) = 16.14%, S(F-2) = 1.044. Na4Al (PO4)(2)(OH) contains [Al(PO4)(2)(OH4-)](n) chains that run parallel to the [001] direction, which are held together in a three-dimensional structure by their interaction with the sodium cations that reside in the channels between the chains. The structure is very similar to that of the mineral tancoite, LiNa2HAl(PO4)(2)(OH) (C) 1995 Academic Press, Inc