Synthesis, Structure, and Properties of a Dinuclear Cu(II) Coordination Polymer Based on Quinoxaline and 3,3-Thiodipropionic Acid Ligands

• Published in: Journal of inorganic and organometallic polymers and materials 2021-07, Vol.31 (7), p.3089-3100
• Main Authors: Tella, Adedibu C., Owalude, Samson O., Adimula, Vincent O., Oladipo, Adetola C., Olayemi, Victoria T., Ismail, Bushra, Mumtaz, Amara, Rehman, Attiq Ur, Khan, Asad M., Clayton, Hadley S., Tahir, Nawaz M.
• Format: Article
• Language: English
• Subjects: Aminophenol; Chemical analysis; Chemical reduction; Chemistry; Chemistry and Materials Science; Coordination polymers; Copper; Crystals; Inorganic Chemistry; Ligands; Nitrophenol; NMR spectroscopy; Organic Chemistry; Oxygen atoms; Polymer Sciences; Quinoxalines; Single crystals; Spectrum analysis
• ISSN: 1574-1443; 1574-1451
• DOI: 10.1007/s10904-021-01966-7

The coordination polymer [Cu 2 (TDPH) 4 (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 3 , Z = 4. The ligands are hexagonally coordinated to the Cu(II) centre in the form of Cu 2 O 4 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 4 in the presence of [Cu 2 (TDPH) 4 (QNX)].DMF, as catalyst was completed within 11 min. The 4-aminophenol product was confirmed using 1 H NMR spectroscopy.