By Jerry Workman Jr., Lois Weyer
There are lots of demanding situations to operating with close to infrared spectroscopy. Qualitative and quantitative equipment require the applying of chemometric equipment in addition to the identity of adjustments in particular wavelength areas. sensible consultant to close Infrared Spectroscopy presents the mandatory instruments to interpret close to infrared spectra. This publication covers such subject matters as alkanes, carboxylic acids, amines, dienes, alkynes, heterocyclic compounds, amino acids, aldehydes, and artificial polymers as version compounds. it's also worthwhile appendices with details on band destinations for chosen natural compounds, close to infrared absorption bands, spectra-structure correlations, and masses extra.
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Additional info for Practical Guide To Near-Infrared Spectroscopy
A terminal epoxy ring is one case in which methylene C–H groups are influenced by the strained structure and an oxygen atom. 31 It is generally acknowledged that these higher overtones are explained by local mode theory. 32 The peak appears at 8620 cm−1 (1160 nm). 33,34 The assignment is probably a ν + δ combination. 4 METHINE GROUPS The absorption of the single methine proton in the presence of methyl and methylenes is generally too small to be observed and is little mentioned in the literature.
In addition to the fundamentals, the overtone bands also occur at less than two times, three times, and four times the frequency of the fundamental vibrations, and at much less intensity; further discussions on this will describe the factors involving the infrared and near-infrared spectroscopic activity of molecules. 21 ILLUSTRATION OF THE ANHARMONIC OSCILLATOR The model of the anharmonic oscillator or local mode approximation more closely follows the actual condition for molecular absorption than that of the harmonic oscillator.
32 The peak appears at 8620 cm−1 (1160 nm). 33,34 The assignment is probably a ν + δ combination. 4 METHINE GROUPS The absorption of the single methine proton in the presence of methyl and methylenes is generally too small to be observed and is little mentioned in the literature. In the mid-infrared, the fundamental peak is near 2900 cm−1, between the methyl and methylene doublets. This would suggest that its first overtone was also in the envelope of small peaks in the 5882–5555-cm−1 (1700–1800-nm) region.
Practical Guide To Near-Infrared Spectroscopy by Jerry Workman Jr., Lois Weyer