Todorova S.Atanassova M.Kurteva V.2024-07-102024-07-102024-07-102024-07-102018-10-012352-340910.1016/j.dib.2018.08.136SCOPUS_ID:85053082339https://rlib.uctm.edu/handle/123456789/488The data represent the synthesis and structural characterization of two novel polydentate ligands possessing unsymmetrical NH-urea fragment: an open-chain substituted aromatic compound with unsymmetrical urea and secondary amine units (S1) and fused aryloxazinone with unsymmetrical urea fragment (S2). The data include the analyzed NMR spectra, turbo-spray mass spectra, melting points and Rf-values. 1D and 2D NMR spectra are given in the article. The efficiency of the ligands as synergists in the isolation and separation of lantanoid ions is reported in rerence. [1].enData Paper