Two three-dimensional Sc(III)-MOFs: Synthesis, crystal structure and catalytic property

摘要

Two new three-dimensional (3D) Sc(III)-based metal organic frameworks (MOFs) [Sc-2(OH)(2)(TDC)(2)]center dot 4H(2)O (1) and [Sc3O(fum)(3)(H2O)(3)(NO3)]center dot DMF (2) (H2TDC = 2,5-thiophenedicarboxylic acid, H(2)fum = fumaric acid) have been hydrothermally synthesized. For 1, TDC2- ligands connect infinite one-dimensional (1D) -Sc-OH-Sc-OH-chains to form open-framework with rhombic channels along the a axis. In 2, flexible fum e- ligands link adjacent trimer [Sc3O(COO)(6)(H2O)(3)] secondary building units showing hexagonal-closed circular pores with a diameter of approximate 9.9 angstrom. Furthermore, the desolvated material la can retain the framework, presenting good catalytic activity, significant universality and substrate-selectivity for Strecker-type reactions of trimethylsilyl cyanide (TMSCN) and various aromatic aldimines, especially for N-benzyl 4-methoxybenzaldimine.