Vibrational spectra of some monosubstituted-π-arene tricarbonyl-chromium complexes and of methyl benzoate

The use of bimetallics to control the selectivity for the upgrading of lignin-derived oxygenates: Reaction of anisole on Pt and PtZn catalysts

“…5. As expected, at temperatures below 190 K the spectrum is nearly identical to that obtained in this temperature range for Zn-free Pt(1 1 1) and is consistent with IR and Raman spectra for anisole (see Table 1) [33][34][35]. Heating to 215 K, which is sufficient to desorb physisorbed anisole, caused some changes including the emergence of a small peak at 400 cm À1 , a large increase in the intensity of the d(CAH) ring peak at 1000 cm À1 , and a decrease in the intensities of the m(CAH) peaks at 2880 and 3000 cm À1 .…”

“…As noted above, spectra corresponding to higher temperatures were obtained by briefly heating the sample to the indicated temperature and then letting it cool back to 115 K, at which point the spectrum was collected. As would be expected, the spectrum obtained at 115 K contains peaks that are characteristic of molecular anisole and can be assigned via comparison with the corresponding IR and Raman spectra [33][34][35]. Individual peak assignments are given in Table 1.…”

Pressure-Tuning Raman Spectra of the Arene Chromium(0) Chalcocarbonyl Complexes, (η6-C6H5CO2CH3)Cr(CO)2(CX) (X = O, S)

“…Above 15 kbar, these modes exhibit reasonably large pressure dependences (0.82 and 0.31 cm À1 kbar À1 , respectively). Adams and Squire [11] have attributed the three strong peaks observed at 323, 311, and 299 cm À1 in the Raman spectrum of (g 6 -C 6 H 6 )Cr(CO) 3 to n(Cr-R) modes. In our earlier high-pressure work on (g 6 -C 6 H 6 )Cr(CO) 2 (CS) [4] , we assigned the n a (Cr-R) and n s (Cr-R) modes to the 319 m and 280 m cm À1 peaks, respectively.…”

Application of FT-Raman spectroscopy to the study of selected organometallic complexes and proteins

“…The band positions from the IT-Raman spectra of a number of arene chromium tricarbonyl complexes, together with band assignments based on previous assignments in the literature (5,6), are listed in Table 2. It should be pointed out'that the total measurement time for the acquisition of all these spectra was approximately one hour, which is less than the time required to record a comparable spectral region for a single sample using a conventional Raman spectrometer with the same signal-to-noise ratio at 4cm-I resolution.…”

“…Recently, we have employed certain arene chromium tricarbonyl derivatives as probes of enzyme binding sites (3) and as markers in infrared irnrnunoassay (IRIA), a new assay technique employing FT-IR spectroscopy as the method of detection (4). The infrared characterization of these compounds has been undertaken by several groups (5,6) but Raman studies have been limited to date due to the rapid thermal or photolytic decomposition of a large number of arene chromium tricarbonyl complexes under visible laser irradiation.…”