Syntheses And Structure Of Tri-vacant Polyoxometalate Derivatives

In this thesis, two supermolecular compounds based on tri-vacant polyoxometalates (POMs) and main or transition metal complexes with organic imizone were synthesized via self-assembly under ambient temperature and in aqueous solution, and characterized by IR, TGA and single-crystal X-ray diffraction. These compounds are below:1.H6[Na3CuL6(H2O)3][(SiW9Fe3(OH)3O34)2(μ-OH)3]·18H2O (1), hexagonal crystal system, P63/mspace group, cell parameters a=16.3021(2) A,b=16.2991(2) A, c=29.7226(3),γ=120°; V=68446 (4) A3, Z=2。Dc=3.002 (g·cm-3). Final R1,wR2 [I>2σ(I)]为0.0310, 0.0829。2. H8[Na2L6][SiW9Al3(H2O)2O36(μ3-O2/2)]2·15H2O (2) triclinic crystal system, P-1space group, cell parameters a=11.9620162) A,b=12.85376(6) A, c=19.3188(10), a= 101.8460,β=92.6604,γ=115.6157°; V=2590.5 (4) A3, Z=1。Dc=3.506 (g·cm-3). Fina1 R1,wR2[I >2σ(I)]为0.0589,0.1681。Multiple intermolecular interactions drive the supramolecular assembly processes of these compounds. There exist hydrogen bond interaction between polyoxoanions with abundant oxygen on the surface and water molecules as well as organic amine groups, and the interaction makes molecules spread in 3-D space. The anions and cations array regularly according to the electrostatic interaction. The compounds mentioned in this thesis have these interactions and form 3-D suparmolecular structure.