Study of the Suzuki-Miyaura cross-coupling reactions with NHC palladium carbenes in MOF structures and Natural Deep Eutectic Solvents

Abstract

The construction of large organometallic networks formed by the union of ligands through a metal atom, is great interest in the chemistry as it allows the synthesis of large supramolecular complexes, which can encapsulate other compounds, giving it a wide variety of applications. In this way, the study of synthesis of MOFs (Metal-Organic Frameworks) has a great interest, as these materials formed by metal nodes and organic ligands, have many applications, such can it be use as sensors, gas storage, or in the case that interests us, the use in catalysis, all this thanks to the porous character that presents. Since the isolation of an N-heterocyclic carbene (NHC) from Arduengo in 1991, the use of this ligand for the synthesis of MOFs has increased, due to its neutral and strong σ-donor character, some ideal characteristics inside the world of organometallics and catalysis, allowing the formation of a strong bond between the ligands and metal centers. In this context, it is tried to synthesize star-shaped ligands NHC carbene from the triphenyl precursor, and their catalytic properties are studied through Suzuki–Miyaura cross-coupling reaction (usually catalyzed by palladium), creating metal-organic frameworks with different metals. These reactions are kinetically followed by gas chromatography, and it carry out in low toxicity natural solvents with a low eutectic point (NADES).