Metal–Organic Frameworks Based on Alkaline Earth Metals – Hydrothermal Synthesis, X‐ray Structures, Gas Adsorption, and Heterogeneously Catalyzed Hydrogenation Reactions

Abstract

AbstractNew carboxylate systems with alkaline earth metals, namely, [Ca2Na2(L)2(H2O)6]n·nH2O (1, H3L = chelidamic acid) and [Sr3(L)2(H2O)9]n·2nH2O (2), have been prepared by hydrothermal reactions and characterized. The compounds featured different three‐dimensional (3D) structural motifs and new topologies. The amount of void space for the dehydrated materials of 1 and 2 was calculated to be ca. 19 and 35 %, respectively. The dehydrated materials are thermally stable to more than 450 °C. The dehydrated species of 1 and 2 displayed excellent N2, H2, and CO2 sorption capacity at 1 atm pressure. Furthermore, both compounds efficiently catalyze the hydrogenation of alkenes under mild heterogeneous conditions (60 °C, 1 atm H2). The porous catalysts demonstrate size selectivity towards substrates owing to presence of active sites inside the pores of the MOF.