| Abstract |
Five isostructural lanthanide MOFs, [Ln(1 kappa OO , 2 kappa O , 3 kappa O , 4 kappa O -mu(4)-L)(NO3)(DMF)(2)](n).n(DMF) \Ln = La3+ (1), Ce3+ (2), Nd3+ (3), Sm3+ (4) and Dy3+ (5); L = 5-[2-\2,4,6-trioxotetrahydropyrimidin-5(2H)-ylidene\ hydrazinyl] isophthalate; DMF = N, N -dimethyl formamide\, based on dicarboxyl-functionalized arylhydrazone of barbituric acid were synthesized under solvothermal conditions. They were characterized by elemental analysis, FT-IR spectroscopy, thermogravimetric and X-ray diffraction analyses. Crystal structure analysis revealed that these frameworks possess a similar type of two dimensional (2D) structure with a dinuclear \Ln(2)(COO-) 2\ unit acting as a secondary building block. Topological analysis shows that these frameworks display a 3,6-connected kgd; Shubnikov plane (3.6.3.6)/dual net. They exhibit excellent heterogeneous catalytic activities (compound 2 is the most active one) towards the cyanosilylation of aldehydes under solvent-free conditions. These catalysts can be recycled at least up to five cycles without a loss of activity. Compounds 1-5 exhibit luminescence properties in the solid state at room temperature. |
