New lanthanide carboxylate compounds with two-(2D) and threedimensional (3D) structures have been prepared by employing 2,5-bis(prop-2-yn-1yloxy)terephthalic acid (2,5-BPTA) as an organic linker. The compounds, [
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.
A new
organic ligand, 5-(carboxyformamido)isophthalic acid (5-CFIA),
was prepared and employed for the synthesis of two compounds [M3(C10H4O7N1)2(8H2O)]·H2O (M = Cd, Mn). The compounds
have three-dimensionally extended structures. Both the compounds were
found to be luminescent at room temperature. The luminescence nature
was exploited for the detection of Hg2+ ions in an aqueous
medium with good selectivity. The interactions between Hg2+ ions and the compounds quench the luminescence intensity and act
as a turn-off sensor. Both the compounds exhibited low limits for
the detection of Hg2+ ions and in the range mandated by
the WHO. The interactions between Hg2+ ions and the compound
involve the −NH group, which was probed using Raman and IR
spectroscopic techniques. These studies provide important pointers
toward the mechanism of this turn-off luminescence behavior. The compounds
were explored for base-catalyzed aldol condensation and Lewis acid-promoted
β-enaminoester formation reactions. The aldol condensation reaction
uses the −NH functionality as a base. The studies indicate
that the electron-withdrawing group produces products with higher
yields. The β-enaminoester reaction uses the Lewis acid centers,
and the
studies reveal that the electron-withdrawing groups produce lesser
yields of the products. The catalytic nature of the reaction and recyclability
of the catalysts were also established. The catalytic reactions employ
ethanol (aldol condensation) and no solvent (β-enaminoester),
which suggests that the reactions are green and environmentally friendly.
The Mn compound was observed to be anti-ferromagnetic.
A three-dimensional inorganic–organic hybrid [Cd(H2L)(H2O)], was shown to exhibit good catalytic activity as well as to detect highly toxic chromate and dichromate anions in aqueous medium with good selectivity.
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