SYNTHESIS AND CHARACTERIZATION OF [TH] [ZNGAP2O8] (T = CN3H5 AND C4NH9) - 2 MICROPOROUS ZINC-GALLIUM PHOSPHATES WITH THE GISMONDINE STRUCTURE

Two microporous zinc-gallium phosphates (CN3H6)[ZnGaP2O8] (I) and (C4N H10)[ZnGaP2O8] (II) have been synthesised under solvothermal condition s in the presence of guanidinium chloride and pyrrolidine respectively . The structure of (I) has been determined by single-crystal X-ray dif fraction [monoclinic, 12/a, a = 10.041(1), b = 9.220(1), c = 10.469(2) Angstrom, beta = 91.60(1)degrees, V = 969.20 Angstrom(3), Z = 8 at 15 0 K]. Compound (II), prepared as a pure polycrystalline powder [orthor hombic, Fddd, a = 9.993(4), b = 14.525(5), c = 15.028(7) Angstrom at 2 93 K], is isostructural with the previously reported material (C4NH10) [CoGaP2O8]. Although the ZnGaPO materials have the same framework topo logy as the zeolite gismondine, they have very different cage structur es, reflecting the different sizes and hydrogen bonding abilities of t he resident guanidinium and pyrrolidinium cations. (C) 1998 Elsevier S cience B.V. All rights reserved.