Three new metal coordination complexes, namely, [Co (DPE)(H2O)4](DPE)(BS)2 (1), [Co (DPE)2(H2O)4](ABS)2 (2), [Co (DPE)(H2O)4](MBS)2(CH3OH)2 (3) [DPE = (E)‐1,2‐di (pyridin‐4‐yl) ethene, BS = phenyl sulfonic acid, ABS = p‐aminobenzene sulfonic acid, MBS = p‐methylbenzene sulfonic acid] were obtained under hydrothermal conditions. Complexes 1‐3 were structurally characterized by X‐ray single‐crystal diffraction, powder X‐ray diffraction and IR. Complexes 1 and 3 exhibit a one‐dimensional chain structure, and complex 2 does a zero‐dimensional one. These three complexes further generate a three‐dimensional supramolecular architecture via strong hydrogen bonding interactions and packing interactions. These three metal coordination complexes show high catalytic performance for green synthesis of a variety of 3,4‐dihydropyrimidin‐2(1H)‐ones through the Biginelli reactions, which show several advantages such as excellent yields, short reaction times, eco‐friendly synthesis conditions, and simple isolated workup procedure. Interestingly, the order of catalytic activities for these catalysts is the following: 3>1>2, which can be ascribed to the acidities and hydrophobic interactions of phenyl sulfonate groups.
Two new d 10 metal-organic frameworks based on a novel semi-rigid aromatic biscarboxylate ligand, namely, [Zn (RGAA)(BPY) 1/2 ] (1) and [Cd 5 (μ 3-OH) 2 (RGAA) 4 ] (2) [H 2 RGAA = 4-(carboxymethyl)-2-ethoxybenzoic acid, BPY = 4,4 0-bipyridine], have been synthesized by the hydrothermal reaction, and characterized by Fourier transform-infrared, elemental analyses, X-ray single-crystal diffraction, powder X-ray diffraction and thermogravimetric analyses. Complex 1 displays a three-dimensional (3D) network with a (2,3,4)connected (6ˆ3.8ˆ2.10) 2 (6ˆ3) 2 (8) topology, while complex 2 exhibits a 3D framework with a (3,10)-connected (3.4.5) 2 (3ˆ4.4ˆ6.5ˆ18.6ˆ14.7ˆ2.8) topology. The luminescent properties of compounds 1 and 2 have been investigated in detail, where the emission maxima are 464 and 349 nm, respectively.
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