Synthese, Structure And Properteis Of Metal-Organic Coordination Polyers With S- Or O-Ligands

Crystal engineering is involved with the behavior of molecules or chemical groups within the crystal lattice,the control of crystal design and properties, and the prediction of crystal structures. It not only plays a significant role in the research on rationally controlling the structures and properties of cyrstalline solids but also is an important strategy for the fabrication of functional materials from molecules.Coordina tion polymers exemplify how crystal engineering has become a paradigm for the design of new supermolecular structures and the contronl of their properties. Acco rding to the principle of crystal engineering, it is possible to rational design and synt hesis of coordination polymer crystalline materials with predetermined structure.At the same time, coordination polymers can be endowed with optics, electric, magnetism, enantioselective separation and catalysis by selecting functional metal ions and organic ligands with functional groups. As the properties of coordination polymers is determined by their components and framework topologies, the construction of coordination polymer with novel topologies has been received considerable attentions with the development of their potential applications. In this thesis, we mainly utilize the principles of crystal engineering to design and synthesize the metal-organic coordi nation polymers constructed from in order to find the new synthetic pathways of metal -organic coordination polymers and explore their structural characters and their physic al properties. Three novel metal-organic coordination polymers, [Cu(MMTA)₂]_n (1),[Cu(MTA)₂]_n (2),[Ni(MTA)₂]_n (3), have been sythesized through the solvothermal technique.The three compouds show a similar one-dimensional chain.The results analy sis shows that these coordination polymers exhibits three-dimensional supermolecular structures formed by van der waals force. Moreover, we record the photoluminescent spectrum and the thermal stability for these polymers.Subsequently, we demonstrate the solvothermal synthesis of a unique three-dime nsional supermolecular coordination polymer that possesses a zero-dimensional single nucleus copper secondary building units and exhibits three-dimensional supermole cular structures formed by van der waals force. Second-order nonlinear optical effects for the powdersample of 1 have been investigated by optical second-harmonic generation (SHG) at room temperature. The intensity of the green light (frequency -doubled output = 532 nm) produced by the powder sample of the compound isa bout 3.5 times that produced by a KDP powder.At last, we introduce the synthesis of a novel heterometallic coordination polymer. Its structure contains trinuclear mixed metal clusters as SBUs, which are further conn ected by BTC to form a 3D open-framework. Magnetic studies of the compound shows a dominant antiferromagnetic exchange between the Mn(II) ions.