Self-Assembly And Catalyze Property Of The Polynuclear Metal-Organic Compounds

The supramolecular chemistry is highly ordered system constructed by two or more moleculars through interaction between different molecules. The interaction between host and guest could lead to the structure changing of host and is the base of molecule recognition, homogeneous catalysis and heterogeneous catalysis. The cavity of the polynuclear metal-organic complex can encapsulate and stabilize guest substrates through interaction with selective signal response and some special chemical reactions can be catalyzed.1. Self-assembly of tetrahedral metal-organic cage-like compound and it application in asymmetric catalysis:It is based on using a C3-symmetric Schiff base ligand L1 which comprises three bidentate coordinating sites, forces various metal ions to form metal-organic tetrahedral cage-like compounds. Crystal structure shows that the cationic cage has an ideal tetrahedral symmetry. By CD tests, we find the tetrahedral compound with chiral structure. Host-guest complexation behaviour between the tetrahedron compound and anthracene derivatives was investigated using the method of fluorescence titration. The cation tetrahedron host could encapsulate the anthracene derivative vis static andπ-πinteraction. Asymmetric Diels-Alder reaction catalyzed by the tetrahedral complex.2. The hydrolysis of BNPP catalyzed by dinuclear metal complexes:The crystal structures of two new Schiff base dinuclear transitional metal complexes L2-Zn and L2-Cd were synthesized and characterized. Two dinuclear complexes were used in heterogeneous catalysis phosphodiester cleavage in an aqueous solution. The process of BNPP hydrolysis has been proposed based on analyses at 400nm UV-visible absorbance spectra. The result shows these dinuclear metal complexes are highly active heterogeneous catalysis BNPP cleavage, with a rate constant of 7.7*10-7S-1 and 8.84*10-7S-1, respectively.