Preparation And Transmetalation Of Series Of Metal-Organic Salts Based On N,N?-Bis(Pyridin-4-Ylmethyl)Ethane-1,2-Diamine

Metal-organic salts(MOSs)are composed of metal anions and organic cations through non-covalent bond interactions.Unlike Metal-organic Frameworks(MOFs)and general organic complexes,they are another hybrid metal-organic solid.Recently,MOSs has attracted widespread attention due to its special structural topologies and potential application prospects,it has been widely used gas adsorption,selective gold separation,molecular inclusion and other fields.Transmetalation is one of the basic reactions of organometallic chemistry,refers to transfer of organic groups or ligands from one metal to another.Generally,transmetalation is defined as metal exchange between organometallic compounds and metals or other organometallic compounds.In a narrow sense,it means that the metal nodes in the organometallic crystal materials are partially or completely replaced by other metals.In recent years,it has become an important method for synthesizing organometallic crystal materials.In this thesis,an organic ligand N,N'-bis(pyridine-4-methyl)ethylenediamine(L)is designed and synthesized,and then through the metal halide MX2(M=Zn,Co;X=Cl,Br)and ligands to prepare a series of metal-organic salts,labelled as[H4L]4+·2[ZnCl4]2-·2H2O(1)?[H4L]4+·2[CoCl4]2-·2H2O(2)and[H4L]4+·2[ZnBr4]2-·2H2O(3).The crystals were characterized and analyzed by IR,TG,PXRD and SC-XRD.More crystals could be obtained by the solid-state grinding in a green and high-efficiency manner.For metal salts[H4L]4+.[CuCl4]2-·2Cl-(4)and[H4L]4+.2[CuCl4(H2O)]2-(5)which are not easily obtained under solution conditions,by Metal salts 1 and 2 are prepared by transmetalation and mechanical grinding.The solid-state conversion relationship between metal salts 1-5 was studied.The progress of the reaction was monitored using PXRD dynamic tests and solid-state fluorescence,which proved that salts 1-2 and 4 can achieve reversible conversion under different conditions.