Manganese-Based Metal-Organic Frameworks as Heterogeneous Catalysts for the Cyanosilylation of Acetaldehyde

Two new metal-organic frameworks (MOFs), namely [Mn-3(atpa)(3)(dmf)(2)] and [Mn-2(tpa)(2)(dmf)(2)], were prepared in N,N-dimethylformamide (dmf) from manganese(II) nitrate and two dicarboxylic acid ligands, 2-aminoterephthalic acid (H(2)atpa) and terephthalic acid (H(2)tpa). The molecular structures of these MOFs are compared to two related coordination polymers, namely [Mn-3(atpa)(2)(Hatpa)(2)] and [Mn-3(tpa)(3)(-)(def)(2)], which were obtained in N,N-diethylformamide (def), to examine the effect of slight ligand or solvent changes on the framework architecture. The four Mn-based MOFs were used as effective Lewis catalysts for the cyanosilylation of acetaldehyde. The four heterogeneous catalytic systems can be re-used without any apparent loss of activity.