OPEN-FRAMEWORK ZINC PHOSPHATES SYNTHESIZED IN THE PRESENCE OF STRUCTURE-DIRECTING ORGANIC AMINES

摘要

Four open-framework zinc phosphates have been synthesized in the presence of structure-directing organic amines. Crystal data: compound I, [NH3(CH2)2NH3.Zn2(HPO4)2(H2PO4)2], monoclinic, space group=P21/c (No. 14), a=16.420(2) angstroms, b=7.826(1) angstroms, c=14.640(1) angstroms, beta=116.47(1) degrees, V=1684.05(2) angstroms3, Z=4, M=578.8(1), Dcalc=2.22 g cm-3, MoKalpha, RF=0.05; compound II, [NH3(CH2)2NH3.Zn(HPO4)2], monoclinic, space group=P21 /c (No. 14), a=5.161(1) angstroms, b=15.842(2) angstroms, c=12.027(2) angstroms, beta=92.36(2) degrees, V=982.41(1) angstroms3, Z=4, M=319.45(1), Dcalc=2.16 g cm-3, MoKalpha, RF=0.06; compound III, [NH3CH2CH(OH)CH2NH3.Zn2(HPO4)3], monoclinic, space group=P21/c (No. 14), a=8.615(1) angstroms, b=9.648(1) angstroms, c=17.209(1) angstroms, beta=93.02(1) degrees, V=1428.4(2), Z=4, M=510.8(1), Dcalc=1.79 g cm-3, MoKalpha, RF=0.03; compound IV, [NH3(CH2)6NH3.Zn3(HPO4)4H2O], monoclinic, space group=C2/c (No. 15), a=16.815(1) angstroms, b=8.970(1) angstroms, c=15.080(1) angstroms, beta=97.25(1) degrees, V=2256.4(1), Z=4, M=734.3(1), Dcalc=2.16 g cm-3, MoKalpha, RF=0.05. The compounds are made up of ZnO4 and PO4 tetrahedra that share vertices. The connectivity between the ZnO4 and PO4 units gives rise to layers in I, III, and IV and a chain architecture in II. The structure-directing organic amine holds the chains and the layers in position through multi-point H bonding. The layers in I and III consist of bifurcated 12-membered rings, and those in IV, of 8-membered rings. The phosphate units occur either as H phosphate (HPO4) or dihydrogen phosphate (H2PO4) moieties. 29 refs.