Synthese, Structure And Properties Based On Phosphomolybdate Complex

Six novel compounds phosphomolybdate containing P2Mo5and P4Mo6building blocks hasbeen synthesized under hydrothermal conditions by controlling the feeding mode,temperature, and adjusting pH value,which are determined compounds of the formula byElemental Analysis,ICP and TG.[H2(en)2]{Ni(Hen)(en)[Mo5P2(OH)O22]}·3H2O （1）[(HPO4)2Mo5O15][CuI(4,4’-bipy)]2[CuII(en)2]6H2O （2）[(HPO4)2Mo5O15][CuI(4,4’-bipy)]46H2O （3）[Cd(pztt)(H2O)2]4[CdMo12VO24(OH)6(HPO4)4(H2PO4)2(PO4)2]·10H2O （4）[H2(en)]5[Cd(H2O)][CdMoⅴ12O30(HPO4)6(H2PO4)2]·5H2O （5）(en)2(Hen)4·Ni(H2O)[Ni1/2Mo6O15(HPO4)3(PO4)][Ni1/2Mo6O15(HPO4)(PO4)3]·4H2O （6）(en=ethylenediamine,4,40-bipy=4,4’-bipyridine, pztt3-(pyrazin-2-yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazliyi)All the title complexes are characterized by IR spectroscopy and single-crystal X-ray diffraction.Structural analysis showed the compound1consists of the Mo-Ni dimensional building blocks [Ni(en)(Hen)(HP2Mo5O23)]2-,double protonated ethylenediamine cations and water molecules ofcrystallization.In addition,there are two coordination mode in the compound between the en ligandand nickel atom.The compound2contains {Mo5P2O21(OH)2}4-anion,[CuI(4,4’-bipy)] and[CuII(en)2],and lattice water molecules, there are three crystallographically independent Cu atoms.The one-dimensional chain structure was formed by atypical N... O and C... O hydrogen bonds of thecarbon and nitrogen of ethylenediamine connecting with oxygen atoms of {P2Mo5} Cluster.Two-dimensional supramolecular structure of the compound was formed between the chain and thechain. A two-dimensional layer structure and a [CuI (4,4’-bipy)] chain has been shown thestaggered-ABAB-type structure along with the C-axis. In the asymmetric unit of compound3,thereare four independent CuI center.Cu2atom is linked with adjacent Cu (1) and Cu (3) atom through4,4’-bipy ligand forming a chain geometry {CuN2}. Cu (4) atoms is bonded with two nitrogen atomof4,4-bipy ligand to form another one-dimensional chain structure.The compound4contains three types of octahedral Cd2+cations which have three kinds of coordination environment.Each {Cd (2)(pztt)(H2O)2} complex is linked with two end groupsphosphorus oxygen atoms of two identical [Cd (Mo6P4)2] uint forming a doublesupport dimeric structure. Two adjacent double support dimeric structure form a rareone-dimensional chain structure through two {Cd (3)(pztt)(H2O)2} units.In thecompound5,{Cd[(Mo2O5)3(PO4)(HPO4)2(H2PO4)]2}14-cluster is coordinated with[NH3(CH2)2NH3]2+，[Cd(H2O)]2+and H2O through electrostatic attraction andhydrogen bonding of Water molecules to form a two-dimensional layered structure.Thecompound6contains two crystallographic independ Ni atoms, Ni1and Ni2atomichave equivalen structural units.All of them were coordinated with Three oxygen Bridgeof each [Ni1/2Mo6O15(PO4)4] unit to form Octahedral sandwich NiO6Structure.The electrochemical properties of compounds1-6were studied by cyclicvoltammetry, which has been shown good stability cyclic voltammetry.Asmeanwhile,the electricity Catalytic properties ofcompound1,5and6wereinvestigate,showing that all the three have good catalytic activity for the aqueoussolution containing BrO3-. On the another hand the fluorescence properties werestudied,showing that the maximum radiation peak owing to the ligand,The maximumemission wavelength of4and5be assigned to the intraligand π→π*fluorescentemission of the ligands.At the same time,the thermal stability of compounds1-6werestudied.