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

Abstract Two new three-dimensional (3D) Sc(III)-based metal organic frameworks (MOFs) [Sc2(OH)2(TDC)2]·4H2O (1) and [Sc3O(fum)3(H2O)3(NO3)]·DMF (2) (H2TDC = 2,5-thiophenedicarboxylic acid, H2fum = 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 fum2- ligands link adjacent trimer [Sc3O(COO)6(H2O)3] secondary building units showing hexagonal-closed circular pores with a diameter of approximate 9.9 A. 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.