Synthesis, Structure, and Properties of a Dinuclear Cu(II) Coordination Polymer Based on Quinoxaline and 3,3-Thiodipropionic Acid Ligands
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Date
2021
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Abstract
<jats:title>Abstract</jats:title>
<jats:p>The coordination polymer [Cu<jats:sub>2</jats:sub>(TDPH)<jats:sub>4</jats:sub>(QNX)].DMF, (QNX = Quinoxaline; TDPH = 3,3-thiodipropionic acid), has been prepared by reaction of copper acetate, TDPH, and quinoxaline. The compound was characterized by elemental analysis, FTIR spectroscopy, and single-crystal X-ray diffraction. The crystal is monoclinic with a P21/n space group and dimensions of a = 12.889(3) Å, b = 14.983(4) Å, c = 14.091(3) Å, α = 90 °, β = 90.200(11) °, γ = 90 °, V = 2721.18 (2) Å<jats:sup>3</jats:sup>, Z = 4. The ligands are hexagonally coordinated to the Cu(II) centre in the form of Cu<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>N with one nitrogen atom from the quinoxaline ligand, and four oxygen atoms from four TDPH molecules in a monodentate fashion. The Cu-Cu bond length was 2.642(1) and 2.629(1) Å for the Cu1----Cu1 and Cu2----Cu2 bonds. The QNX ligand bridged the two copper atoms. The catalytic reduction of 4-nitrophenol to 4-aminophenol using NaBH<jats:sub>4</jats:sub> in the presence of [Cu<jats:sub>2</jats:sub>(TDPH)<jats:sub>4</jats:sub>(QNX)].DMF, as catalyst was completed within 11 minutes. The 4-aminophenol product was confirmed using <jats:sup>1</jats:sup>H NMR spectroscopy.</jats:p>