Abstract
This thesis used by hydrothermal method. Four organic-incorporated vanadyl phosphates were synthesized(A1~A4).A1 and A2 are vanadyl phosphates structure,A3 and A4 are zinc vanadyl Phosphates structure. These four compounds are used 2,5- Pyridinedicarboxylic acid ( PYDC )、1,2,4,5-tetra-(4-pyridyl)cyclohexanol (TPCH) or 4,4’-bipyridine (BPY) as ligands then formed 1-D (A2) 、2-D (A1) 、3-D (A4) 、 quasi-3-D (A3) structures. A1~A4 are paramagnetic in room temperature and antiferromagnetic in hypothermia. A3 and A4 have good capability of carbon dioxide adsorption. All compounds were characterized by single crystal X-ray diffraction and measured the magnetic properties and the gas adsorption. A1 and A2 used ligand PYDC to coordination. Their formula are [H2BPY] [(VO)2(HPO4)2(PYDC)] and [H2BPY]2 [(VO)2(H2PO4)2(BPY)(PYDC)2 ]‧2H2O . A1 structure are vanadium and phosphate connected by coconner to formed 4-ring chain. These chains are interlinked by PYDC to formed 2-D structure. A2 structure’s secondary building units(SBUs) are composed by vanadium、phosphate and PYDC ligand. The SBUs connect by BPY to formed 1-D structure. To increase variety and diversity of structure. A3 and A4 were added zinc metal in the reaction systems. Their formula are [H4TPCH]0.5[Zn2(H3TPCH)2(HPO4)(HPO3)][Zn(VO)8(OH)4(PO4)6 (HPO4)2] ‧ 3H2O and [Zn2(BPY)VO(H2O)(PO4)2] ‧ 4H2O. A3 is a quasi threedimensional supramolecular structure. Its composed by vanadyl phosphate polyanion、 cation of ligand TPCH zinc phosphate phosphite and TPCH cation. Linked by hydrogen bonds between the three. A4 is a neutral three-dimensional framework of organicinorganic composite. The BPY is a bridge to connected zinc vanadyl phosphate layers. Both A3 and A4 have porosity. A3 CO2 adsorption is 7.91 cm3/g in 273 K and 6.54 cm3/g in 298 K. A4 CO2 adsorption is 66.3 cm3/g in 273 K and 57.3 cm3/g in 298 K. The different of A3 and A4 CO2 adsorption is due to A4 structure have open metal sites but A3 haven’t. Because of A4 in the coordinated water for vanadium can be removal, resulting in a vacant site to enhance the interaction with carbon dioxide. A4 CO2 adsorption amount even more than ZIF-82(52.7 cm3/g,the most CO2 adsorption amount in ZIF systems )in 298 K. A4 possess high thermal stability(~ 400 oC) and catalytic to be a potential material with catalytic carbon dioxide into organic small molecules.