C−C Coupling of Aryl Chlorides and Reduction of Nitroarenes to Amines Employing Recyclable Heterogeneous Green Catalysts

Abstract

Two new isostructural inorganic coordination polymers, [M(C 14 H 8 O 6 )(C 10 H 8 N 2 )2H 2 O)] • (C 3 H 7 NO), (M=Co, Ni) were prepared employing 2, 5-bis(prop-2-yn-1yloxy)terephthalic acid (2,5 BPTA) and 4,4' bipyridine as ligands. The connectivity between the metal-centers and the ligands give rise to a two-dimensional layer structure. The Nicontaining one has higher stability compared to the Cocontaining one. The Co-containing compound, 1, was heated in Ar-atmosphere to prepare Co-nanoparticles, supported over graphitic carbon. The Co@CÀ T compounds were found to be active for the Bechamp reaction of reduction of nitroarenes to aminoarenes under solvent-free condition with good yields and recyclability. The Ni-containing compound, 2 was loaded with Pd-nanoparticles by known procedures. The Pd@2 samples were found to be a good catalyst for the Suzuki-Miyaura CÀ C coupling of chloroarenes in ethanol at 75 °C in good yield. The present work demonstrates a clean approach for the preparation of new heterogeneous catalysts for the reduction of nitroarenes and especially towards activating chloro-arenes under recyclable reaction conditions. These catalysts and the reactions are green as the Bechamp reaction employing the Co@CÀ T catalysts was carried out under solvent-free conditions and the Pd@2 catalysis employing environmentally benign ethanol.

Turn-off luminescence sensing, white light emission and magnetic studies of two-dimensional lanthanide MOFs

“…The UV-Vis absorption spectra indicated bands corresponding to the π–π* and n–π* transitions of the ligands 2,5-BPTA, 2,2′-bipyridine and 1,10-phenanthroline. 60,61 The spectra exhibited a red shift in the absorption of the π–π* and n–π* transitions in the metalated compounds (Fig. S6 and Table S6†).…”

Blue-Emitting Ligand-Mediated Assembly of Rare-Earth MOFs toward White-Light Emission, Sensing, Magnetic, and Catalytic Studies

“…The water molecules also interact with the layers through the H bond interaction (Figure S11). (9), Ce (10), Pr( 11)) have three-dimensional structures. As a representative example, the structure of the lanthanum compound ( 9) is described here.…”

“…Metal–organic frameworks (MOFs), also known as coordination polymers (CPs), have been at the forefront of important hybrid materials during the last two decades. − Their large surface area, tunable porosity, and functionality have contributed toward the target-specific guest-accessible applications in the areas of gas storage and capture, gas separation, catalysis, magnetism, drug delivery, etc. − …”

Fixing CO2 under Atmospheric Conditions and Dual Functional Heterogeneous Catalysis Employing Cu MOFs: Polymorphism, Single-Crystal-to-Single-Crystal (SCSC) Transformation and Magnetic Studies

“…Research on metal–organic framework (MOF) compounds occupies a prime position during the last 2 decades. − MOFs have transformed the focus of research in inorganic material chemistry. The versatility of the compounds has been established by their many interesting potential applications in the areas such as sorption, − separation, , luminescence, − catalysis, − proton conduction, − magnetism, , etc. The developments over the years allowed the focus of the research to shift toward preparing the compounds for tailor-made purposes such as high porosity and surface area, increased number of active catalytic centers, multiple chemical functionalities, etc. − To achieve these goals, one needs to make a careful choice of the metal node (ions), a linking ligand that hosts the multiple functionalities, and also a possible secondary ligand.…”