Abstract
AbstractA new quinoline carboxylate‐based cobalt (II) metal compound, [Co (HL1)2(H2O)4] (1) (H2L1 = 2‐hydroxyquinoline‐4‐carboxylic acid) has been hydrothermally synthesized, and fully characterized by single‐crystal X‐ray diffraction, powder X‐ray diffraction, Fourier‐transform infrared (FT‐IR), elemental and thermo‐gravimetric analysis. Compound 1 shows high thermal stability up to ~300°C. Single‐crystal X‐ray diffraction study of 1 exhibited monomeric structure experiences further stabilized in solid state through different non‐covalent interaction, for example, H‐bonding and π···π stacking interaction and extended to 3D supramolecular H‐bonded network. Compound 1 efficiently catalyzes epoxidation reactions of olefins under homogeneous conditions using molecular oxygen as an oxidizer. Another reported quinoline carboxylate‐based nickel (II) monomer [Ni(L2)2(H2O)2] (2) (HL2 = thiazole‐4‐carboxylic acid) has been synthesized and characterized to compare it with compound 1 towards aerobic epoxidation reactions, where 1 comes as superior.
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