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Synthesis and investigation of binuclear rare earth complexes based on bis-chelating carbacylamidophosphate
Authors: O.Y. Horniichuk, N.S. Kariaka, V.O. Trush, S.S. Smola, T.Y. Sliva, N.V. Rusakova, V.M. Amirkhanov
Number of views: 280
The binuclear rare earth coordination compounds based on bis-chelating carbacylamidophosphate (CAPh) – tetramethyl(2,2,3,3,4,4-hexafluoro-1,5-dioksopentan-1,5-diyl)-bis-amidophosphate (H2L) were synthesized for the first time. A synthesis procedure for obtaining coordination compounds of general formula Ln2L3Phen2 (where Ln3+=Nd3+, Eu3+, Y3+, and Phen=1,10-phenanthroline) was developed. Based on the data of NMR, IR and electronic spectroscopies, the composition of the synthesized compounds was determined. It was established that CAPh ligand is coordinated to metal ions in deprotonated form (L2–) via oxygen atoms of carbonyl and phosphoryl groups. Thermogravimetric study of the europium complex showed its thermal stability up to about 200C. It was stated that upon UV irradiation the obtained neodymium and europium complexes exhibit luminescence in IR and visible regions, respectively. Luminescence excitation spectra of the complexes specifies to effective sensitization of lanthanide luminescence by organic ligands. The ratio between the intensities of the bands of the f–f transitions in the luminescence spectrum of the obtained europium complex points to low symmetry of central ions in coordination environment.