Raman spectra and vibrational analysis of molybdenum cluster compounds

Resonance Raman Spectra of [M6X8Y6]2-Cluster Complexes (M = Mo, W; X, Y = Cl, Br, I)

“…Some have suggested, quite reasonably given the foregoing arguments, that the "group-frequency" concept is invalid when analyzing the [M 6 X 8 Y 6 ] 2clusters. 15 The Raman data in this study demonstrate that, contrary to expectations, these complexes behave very much as if the symmetric normal modes are accurately represented by the unmixed symmetry coordinates. Experimentally, the breathing modes of the M 6 cage, the X 8 cube, and the apical Y 6 cage act as group frequencies.…”

Retention of the octahedral metal framework of Nb and Mo halide clusters in catalytic decomposition of phenyl acetate to phenol and ketene

“…For example, the and (4). On the other hand, the spectra of the 250-600 • C-treated samples are quite similar to that of authentic 1 [47,56]. Thus, the result from Raman spectrometry accords with the discussion on the XRD analyses.…”

Vibrational spectra of intra- and inter-metal and semimetal bonds

“…From a Raman study of methanol solutions of the compounds Mo6C18Y62-(Y = Cl, Br, I), two of the three Aig modes have been identified by their total polarization with the third Aig mode attributed to bands of undetermined polarization. 244 In this study approximate Mo-Mo stretching force constants are given as 1.6, 1.6, and 1.4 mdyn/A and the AJg y(Mo-Mo) modes are assigned at 236,150, and 117 cm-1 for Y = Cl, Br, I, respectively. The Aig y(Mo-Mo) and y(Mo-Y) modes, however, are also observed to be completely mixed.…”