Synthesis and competitive Li-7 NMR studies of two morpholine-based ligands

Rezaeivala M., Zebarjadian M. H., SAYIN K.

JOURNAL OF MOLECULAR STRUCTURE, cilt.1242, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1242
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.molstruc.2021.130703
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

Li-7 NMR spectroscopy was used to investigation the stability, stoichiometry and thermodynamic information of a Li+ complex with one known, N1-(2-morpholinoethyl)-N1-((pyridine-2-yl)methyl)propane1,3-diamine (A(1)) and one new asymmetrical branched amines, N1-(2-morpholinoethyl)-N1-(pyridine-2yl)methyl)butane-1,4-diamine (A(2)) in various acetonitrile-nitromethane solutions. Competitive 7Li NMR was used to probe the complexation of these two amines with Co2+, Ni2+, Cu2+ and Li+ ions in the same solvent systems. The stability constants of the resulting complexes were estimated from fitting of the mole ratio information using an equation that relates the observed chemical shifts to the stability constants. There is a reverse relationship between the stability of the complex and the amount of acetonitrile in the solvent mixture. In all the solvent mixtures, the stability of the 1:1 complex were found to change in the order M-A(1) > M-A(2) and Co2+ > Ni2+ > Cu2+ > Li+. Computational investigations on the ligand structures have been carried out. (C) 2021 Elsevier B.V. All rights reserved.