Analysis of coordination states for Dy(II) and Dy(III) complexes in ionic liquids by Raman spectroscopy and DFT calculation

摘要

The coordination states of the divalent and trivalent dysprosium complexes in ionic liquid, triethyl-pentyl-phosphonium bis(trifluoromethylsulfonyl) amide [P-2225][TFSA] were investigated by Raman spectroscopy and DFT calculations. The concentration dependences of the deconvoluted Raman spectra were investigated for 0.23-0.45 mol kg(-1) of pure Dy(III) and the mixed sample of Dy(II)/Dy(III) = 1/3 at the molar ratio in [P-2225][TFSA]. According to the conventional analysis, the solvation number; n of Dy(II) and Dy(III) in [P-2225][TFSA] were determined to ben = 4.12 and 5.00, respectively.