The coordination states of the multivalent neodymium complexes in potassium bis(trifluoromethyl-sulfonyl) amide; K [TFSA] were investigated by Raman spectroscopy. The concentration dependences of deconvoluted Raman spectra were investigated for 0.23-0.45 mol kg −1 Nd(III), and mixed sample of Nd(II)/Nd(III) = 1/3 at the molar ratio in K [TFSA]. According to the conventional analysis, the solvation number; n of neodymium complexes were determined to be n = 4.06 for Nd(II), 5.02 for Nd(III Rare earth (RE) elements have peculiar physicochemical properties and are indispensable for abrasives, catalysts, fluorescent materials and permanent magnets. [1][2][3][4] In particular, Nd-Fe-B permanent magnets have high ferromagnetic performance and it has been used for a variety of high-tech products, such as voice coil motors in hard disk drives, magnetic field sources for magnetic resonance imaging, driving motors for hybrid-type electric vehicles etc. 5-7From the standpoint of energy conservation, the development of a recovery process for RE metals with reduced energy consumption is desired. In previous investigations, we demonstrated the recovery of Nd metal using low-temperature molten salts (LTMSs), 8,9 because an LTMS has many useful physicochemical properties 10,11 such as a wide electrochemical window, low liquid-phase temperature, and high ionic conductivity. From an environmental point of view, LTMSs are stable compared to organic reagents and prevent the spreading of noxious decomposition chemicals because LTMSs can be recycled back into acid production cycles and be applied repeatedly as an electrolytic bath. Potassium bis(trifluoromethylsulfonyl) amide; K[TFSA] melts consisting of a potassium cation and a bis(trifluoromethyl-sulfonyl)amide;[TFSA] anion, as shown in Fig. 1, are useful candidates for LTMSs.In the case of the ionic liquids (ILs), it was known that the electrodeposition process was remarkably affected by the solvation structure of metal ion. It was reported that the solvation structures of various metal ions, Li,[12][13][14][15][16]

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