Synthesis,Structure,and Properties Of Coordination Polymers Of 3,5-bis(1',2',4'-triazol-1'-yl) Pyridine

Synthesis of metal organic coordination polymer has been the subject of intense research discussis in the field of inorganic chemistry.The simple organic molecule 1,2,4-triazole and its derivatives have rich coordination modes,which were widely used in biology,medicine,industry and other industries.Seven coordination polymers were synthesized by solvothermal method.3,5-bis(1',2',4'-triazole-1'-yl)pyridine(btap)were choosed as the N-containing ligand,and 4,4',4'',4'''-tetrakiscarboxyphenylsilane,formic acid,pyromellitic acid as well as oxalic acid were selected as the carboxylate ligand to act with different transition metal ions Co(?),Zn(?)and Cd(?)respectively.The structures of seven coordination polymers were determined by single crystal X-ray diffraction,the network topology were studied by topos software,and the fluorescence properties of some coordination polymers were explored in detail.The surface enhanced Raman spectra of NaY zeolite loaded with silver nanoparticles were studied.Meanwhile,the Raman properties of NaY zeolite loaded with silver nanoparticles were investigated.1.Four novel coordination polymers[Co(fa)2(btap)2](1),[Zn3(btc)2(btap)4(H2O)2](2),[Cd3(btc)2(btap)(H2O)](3)and[Cd(oa)(btap)](4)were synthesized by the reaction of 3,5-bis(1',2',4'-triazole-1'-yl)pyridine,formic acid,pyromellitic acid and oxalic acid with transition ions(Co2+/Zn2+/Cd2+).Coordination polymer 1 featured a two-dimensional(2D)4-connected framework with the point symbol of(44)(62)topology.The structure of 2 was a 2D(2,3,4)-connected framework with(83)2(8·12)2(8)3 topology.Coordination polymer 3 had approximately a planar 2D network with(63)topology.Coordination polymer 4 with(126)(12)2 topology owned a 4-connected three-dimensional(3D)structure.The results of luminescence properties of coordination polymers 3 and 4 showed that Fe3+,Ce3+,Cr2O72-and MnO4-ions can be detected effectively in water.2.3,5-bis(1',2',4'-triazole-1'-yl)pyridine and 4,4',4'',4'''-tetrakiscarboxyphenylsilane reacted with transition metal ions(Co2+/Cd2+)to afford three novel coordination polymers:[Co2(tcps)(btap)(H2O)3](5)?[Co3(Htcps)2(btap)(H2O)6](6)and[Cd3(Htcps)2(btap)(H2O)6](7).Coordination polymer 5 features a 3D framework with(6·75·84)(64·82)(72·9)topology.Coordination polymers 6 and 7 are isomorphic,which exhibit an especial 1D+3D?3D polythreaded supramolecular network,that the 1D chain inserted into the channels of the two-fold interpenetrating 3D motif.The hydrogen bonds which between the 3D part and the 1D cationic part were further firmed the coordination polymers.The structure of coordination polymers 6 and 7 is a 3D 3-connected framework with(103)4 topology.The luminescence properties of coordination polymer 7 which were solid state and dispersed in different solvents were explored.Luminescence studies have revealed that 7 displayed superior sensitivity and stable antiinterference towards Fe3+ and Cu2+ cations in aqueous solution.3.A surface enhanced Raman scattering(SERS)substrate was made by embedded silver nanoparticles into NaY zeolite.Taking the advantage of the large cavity and channel of zeolite,high uniformity makes this substrate become notable.The particle size of silver varies with the concentration,and the silver nanoparticles were aggregated by rich hydroxyl groups,which produced "hot spots",greatly enhanced the SERS signal.It can be used for trace detection of explosives.