Raman methanol spectra

Methanol is an effective cocatalyst in conjunction with boron fluoride. Okamura et al. aa ribed this initiation capability to the formation of a partly dissociated complex between Lewis acid and alccdud. This su esticm was recently verified in a specific study on this interaction involving vibrational spectroscopy Boron fluoride was found to give well-defined 1 1 and 1 2 adducts vnth methanol and the Raman spectrum of the latter complex indicated scmie dissociation according to tire reaction... 

IR spectra of pyridazines and polypyridazines were studied with respect to interactions with the side chain. The IR spectral shift due to hydrogenbonding between methanol and pyridazine (and other azines) was determined the Av was compared with the pK . In connection with the structure of maleic hydrazide and its methyl derivatives, the Raman spectrum of the 1,2-dimethyl derivative was recorded and helped to explain the anomalously low reported IR carbonyl frequency. The laser Raman polarization spectrum of the lattice vibrational region of pyridazine was reported. ... 

Figure 9. Comparison of TNT spectra excited at 514.5 nm (a) normal or spontaneous Raman spectrum of TNT (b) subtracted TNT spectrum in methanol solution (c) SERB TNT spectrum on Ag nanoparticles. Peak labels correspond...

The Raman spectra of quinol clathrates unlike the infrared spectra [4], are not dominated in the 2700-3700 cm" region by the OH band of the host lattice. It is consequently quite easy to observe the methanol guest molecule bands in the Raman spectrum of the clathrate (Fig. 2a), and the difference spectrum (Fig 2c) merely highlights the intensity of the guest molecule bands. 

Figure 17.2. Raman spectrum of bulk Mo03/Fe2(Mo04)3 catalysts commercially employed for methanol oxidation to formaldehyde. Source K. Routray and 1. Wachs.

Figure 1812 Surface-enhanced Raman spectra of phenylacetylene adsorbed from a 1% v/v solution in methanol onto (a) silver-doped and (b) gold-doped TEOS sol gel. (c) Standard Raman spectrum of the neat hquid. (Courtesy of Stuart Farquharson, Real-Time Analyzers, Inc.)...

Figure 6. The complex OH stretching spectrum of methanol trimer (bottom) can be explained by sum (v5), difference (vD), and hot bands (vH) involving the OH fundamental (vF) and two umbrella modes of the methyl groups, which are nearly degenerate in the ground state but soften and split after OH stretching excitation. vR is the predominantly Raman active concerted stretching mode [16].

The methoxylation can be carried out by reacting silica with methanol vapor at 300-400°C, or by refluxing silica in methanol (21,36). Because the infrared spectrum of the modified surface is well understood (36) we chose to use this system as a model to test the feasibility of using Raman spectroscopy (21 ) for studying such surface modification procedures. 

Figure 2. The Raman spectra of (a) the quinol methanol clathrate (b) 3-quinol and (c) the difference spectrum.

Jonas, Artaki, Zerda and co-workers [68,110,117] have combined Raman spectroscopy, Si NMR, and the molybdic acid reagent technique to monitor the polymerization process of silicate systems as a function of solution pH (1-9) and solvent composition (methanol or methanol plus formamide). Raman and Si NMR investigations were also performed at pressures ranging from ambient to 5 kbar. As in the previously cited examples, it was possible to correlate some of the Raman bands with specific Si resonances. Table 14 lists the assignments of Raman bands observed in the 600-1050 cm" region of the spectrum [110]. 

The n.m.r. spectrum of deuteriated cycloheptene has been studied down to — 171°C and analysis shows a barrier to ring inversion, AF = 20.9 kJ mol possible profiles for the ring inversion are discussed. I.r. and Raman studies of solid and liquid cycloheptene have been interpreted in terms of a chair form in the crystal and equilibrium between boat and chair in the liquid at room temperature. The most probable conformation of cyclohept-4-ene[ H2]methanol has been deduced by lanthanide shifts and coupling constants to be the chair. °... 

Figure 10.16 Resonance Raman spectra of chlorophyll-a in methanol as compared to the experimental RR spectrum of PCh-lide [321]. The continuous dark line represents the total spectrum, while dashed lines show contributions from the Sj and S4 states respectively. Inset shows relative computational cost of the different steps...

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