Synthesis, Structures Of Metal Molybdate And Fluorescence Properties Studies

In this paper, we used molybdenum acid or molybdate, transition metal ions,organic ligands, arsenate and phosphoric acid as the main materials, and havebeen sythesized eight polyoxomolybdates compounds through hydrothermalsynthesis method. Two of them were hybrid arsenomolybdates compounds, theothers were hybrid phosphomolybdate compounds. These compounds werecharactered by single-crystal X-ray diffraction analys, IR, PXRD, elementalanylyses and so on and their fluorescence properties were studied. Besides, thephotocatalytic and magnetic properties also were studied for individualcompound.Two hybrid arsenomolybdates compounds {[Cu(H2O)2]Phen}2{[As(OH)]2-Mo6O24}(1) and [Cu(enMe)2]3[As2Mo6O26](2) were obtained throughhydrothermal synthesis method. Compound1displayed2-D structure throughπ···π stacking and compound2displayed3-D structure. The structure of thepolyanion [As2Mo6O26]6-in this two compounds was similar with the structure ofα-[Mo8O26]4-. Compound1crystallized in the triclinic, P-1space group, a=8.6164(5), b=10.1395(4), c=12.7315(5)；α=86.165(3)°, β=83.628(4)°, γ=67.784(4)°；V=1022.99(8)3. Compound2crystallized in the monclinic,P21/c space group, a=13.4800(4), b=9.9246(2), c=19.9238(6)；α=90.00°, β=96.592(4)°, γ=90.00°；V=2647.87(13)3.Three hybrid phosphomolybdate compounds [Cd(H2O)2]3Cd{(H2PO4)2-(HPO4)(PO4)(MoO2)6(OH)3}216H2O (3)、(C6N2H14)2[Mn(H2O)2]3Mn{(H2P-O4)2(HPO4)(PO4)(MoO2)6(OH)3}2Cl46H2O (4)、(C6N2H13)2(C6N2H14)2K[(H2P-O4)3(HPO4)(MoO2)6(OH)3]2Cl32H2O (5) were obtained through hydrothermalsynthesis method, which contained [P4Mo6] structure. Compound3-5displayed2-D structure through hydrogen-bonding. Compound3crystallized in the triclinic,P-1space group, a=12.9380(4), b=13.1960(4), c=14.3467(5)；α=92.567(3)°, β=116.250(3)°, γ=117.482(3)°；V=1851.12(12)3. Compound4crystallized in the triclinic, P-1space group, a=12.3603(5), b=12.9473(6),c=14.1088(6)；α=106.566(4)°, β=109.217(4)°, γ=107.703(4)°；V=1835.45(16)3. Compound5crystallized in the triclinic, P-1space group, a=12.1045(3), b=13.4532(4), c=14.0998(4)；α=63.208(3)°, β=72.232(3)°, γ=88.376(3)°；V=1935.65(11)3.Three hybrid phosphomolybdate compounds (H2dien)2[(HPO4)2Mo5O15]-4H2O (6);(H2en)2[(HPO4)2Mo5O15](7);(Hen)2(H2en)3[(HPO4)2Mo5O15]29H2O (8) were obtained through hydrothermal synthesis method, which contained[P2Mo5] structure. Compound6-7displayed3-D structure and Compound8displayed2-D structure through hydrogen-bonding. Compound6crystallized inthe triclinic, P-1space group, a=10.3232(8), b=10.9631(6), c=15.6915(7)；α=95.780(4)°, β=95.534(5)°, γ=111.401(6)°；V=1627.92(18)3.Compound7crystallized in the monclinic,C2/c space group, a=17.6767(3), b=10.04838(15), c=13.7845(2)；α=90°, β=96.8833(15)°, γ=90°；V=2430.80(7)3. Compound8crystallized in the monclinic, P21/c space group, a=13.8550(6), b=34.5247(13), c=12.9048(6)；α=90°, β=101.848(4)°, γ=90°；V=6041.4(4)3.The solid fluorescence spectrum analysis of the eight compounds showedthat they produced excitation spectrum at424nm wavelengthe under differentexcitation wavelengthe, explain that the eight compounds possessed fluorescentproperties.