Properties of molecular lanthanide crystals spectra in the near-IR region

Lanthanide Carbonates

“…The most intense, wide bands that were located in the spectral range between 2500 and 3750 cm -1 were attributed to the ν NH and ν OH oscillations and to the 2ν CO , 2δ NH 2 , and 2δ OH 2 overtones. [31] A difference in the ν OH positions was observed for I and II. The broadening of the ν OH band at approximately 3380 cm -1 for I, in comparison with that at approximately 3420 cm -1 for II, is consistent with the presence of a coordinated water molecule.…”

Ten‐Coordinate Neodymium(III) Complexes with Triethylenetetraaminehexaacetic Acid

“…Recently, we have shown that the f-f transitions in this spectral region are seriously affected by coincident combination and/or overtone bands. [21,22] The present data also reveal that these bands strongly dominate the f-f transitions of the Nd III ion in the NIR region and this domination is different for the three non-isomorphic crystals studied. As can be seen from the equilibria variations between different species for sodium salts of Nd III -TTHA solutions, exemplified by the 4 I 9/2 Ǟ 2 P 1/2 transition in Figure 3, the shape and intensity of these bands do not change further when the pH of the solution exceeds 4.…”

Two synthesis routes of organometallic precursors for the elaboration of SiCNYO pre‐alloyed nanopowders

“…The FT-IR spectrum of amminolysed yttrium (Fig. 4b) shows that the absorption intensity of C-H bands at 2800 cm −1 [3,15,44,51,52] decreases in comparison with the same bands reported in the spectrum of the commercial triethylamine [N(C 2 H 5 ) 3 ] (Fig. 4a).…”

“…The FTIR spectra of both commercial reagent and silylated product are reported in Fig. 2. www.interscience.wiley.com/journal/aoc [19,30,51] Si-C deformation in Si-methyl group [36,40,59] IR band positions in hydrated yttrium acetate and the specific IR bands in silylated yttrium acetate, prepared with a dehydrated product, are reported in Tables 1 and 2, respectively. First, compared with the silylated product, the IR spectrum of hydrated yttrium acetate (Fig. 2a) exhibits an evolution of the stretching γ (C-C) (960 and 945 cm −1 ) [19] .…”