Far infrared spectra of vaporized neodymium trihalides

Spectroscopic Studies of PrBr3·7H2O Monocrystal

“…3 and discussed in Table II. The energetic position of these phonons agrees with Nakamoto et al report [18] for lanthanide halides and Wells et al studies [19] for lanthanide trihalides. The vibrations of the coordinated water appear at the standard frequency regions [20].…”

Comparison of the spectroscopic behaviour of single crystals of lanthanide halides (X = Cl, Br)

“…Basing on the mode description, Table 5 lists the frequencies of the IR and Raman bands along with the assignments of lines. The energetic positions of the neodymium bromide stretching vibrations agree with the report of Nakamoto and co-workers [24] for lanthanide hexahalides and with the results of the studies Wells et al [25] on neodymium trihalides. The pattern of bands corresponding to the stretching, bending, rocking and wagging vibrations of the coordinated water appears in the standard frequency region [26].…”

Trends in Structure and Vibrational Frequencies of MX 2 and MX 3 High Temperature Halide Vapors

“…Only for LuCI8 (and ScF3) however, is the value of the bending frequency known which permits an accurate shrinkage correction necessary for reliable bond angle determinations from electron diffraction (11,24,25). Far IR spectra of NdC13, NdBr~, and NdI3 show that all four fundamental frequencies are IR active (39), indicative of pyramidal geometries for these molecules.…”