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Controlled Construction of Metal–Organic Frameworks: Hydrothermal Synthesis,X‐ray Structure,and Heterogeneous Catalytic Study
Authors:Dr Rupam Sen  Debraj Saha  Dr Subratanath Koner
Institution:1. Rupam Sen, Debraj Saha, Subratanath Koner, Department of Chemistry, Jadavpur University, Kolkata 700032 (India), Fax: (+91)?33‐2414‐6414;2. Present address: Department of Chemistry, CICECO, University of Aveiro, 3810‐193 Aveiro (Portugal)
Abstract:The role of pH in the formation of metal–organic frameworks (MOFs) has been studied for a series of magnesium‐based carboxylate framework systems. Our investigations have revealed the formation of five different zero‐dimensional (0D) to three‐dimensional (3D) ordered frameworks from the same reaction mixture, merely by varying the pH of the medium. The compounds were synthesized by the hydrothermal method and characterized by single‐crystal X‐ray diffraction. Increase of the pH of the medium led to abstraction of the imine hydrogen from the ligand and a concomitant increase in the OH? ion concentration in the solution, facilitating the construction of higher dimensional framework compounds. A stepwise increase in pH resulted in a stepwise increase in the dimensionality of the network, ultimately leading to the formation of a 3D porous solid. A gas adsorption study of the 3D framework compound confirmed its microporosity with a BET surface area of approximately 450 m2 g?1. Notably, the 3D framework compound catalyzes aldol condensation reactions of various aromatic aldehydes with acetone under heterogeneous conditions.
Keywords:aldol condensation  heterogeneous catalysis  hydrothermal synthesis  metal–  organic frameworks  porous framework
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