Showing papers on "Infrared spectroscopy correlation table published in 1966"
71 citations
01 Jan 1966
TL;DR: In this paper, the authors discuss infrared and nuclear magnetic resonance (NMR) spectroscopy of chlorophyll, which is used for the unambiguous detection of certain functional groups and for structure determinations of organic compounds.
Abstract: Publisher Summary This chapter discusses infrared and nuclear magnetic resonance (NMR) spectroscopy of chlorophyll. The absorption of visible or ultraviolet light by organic molecules is accompanied by the excitation of valence electrons to higher energy levels. Electronic excitation requires quite high-energy quanta, corresponding to light of relatively short wavelength, that is, in the ultraviolet and visible regions. Electronic transition spectra give information about the presence and nature of unsaturation, particularly conjugated double bonds and aromatic ring systems. The vibrational frequencies of molecules lie in the infrared region, and the absorption of radiation in this frequency range excites higher vibrational states. Infrared spectra yield information about stretching and bending motions of the atoms in a molecule. In theory infrared absorption bands arise from molecular motions of the molecule as a whole, but in practice, the absorption frequencies of many structural units are sufficiently independent of the rest of the molecule in which they occur to have characteristic group frequencies. NMR techniques are useful in the study of many problems. NMR data can be used for the unambiguous detection of certain functional groups and for structure determinations of organic compounds. They provide information about stereo chemical configuration and the conformation of molecules. Because the formation of intermolecular aggregates or coordination with other compounds can change the magnetic environment of a given nucleus, NMR spectroscopy is a valuable tool for the study of coordination and self-aggregation.
68 citations
TL;DR: The infrared spectrum of VOF3 has been studied and interpreted in terms of a C3v molecular symmetry as mentioned in this paper, and all six fundamentals have been observed: the a1 frequencies are 1057.8, 721.5, and 257.8 cm−1 and the e frequencies are 806, 308, and 204.3 cm− 1.
Abstract: The infrared spectrum of VOF3 has been studied and interpreted in terms of a C3v molecular symmetry. All six fundamentals have been observed: the a1 frequencies are 1057.8, 721.5, and 257.8 cm−1 and the e frequencies are 806, 308, and 204.3 cm−1. The infrared spectrum of POF3 has also been studied and the lowest e fundamental, earlier observed in the Raman spectrum, has been confirmed.
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TL;DR: In this paper, the spectral properties of 1,2,3-triazole N-oxides in the range 4000-400 cm−1 were examined and compared with those of the analogous triazoles.
Abstract: Infrared spectra of several 1,2,3-triazole N-oxides in the range 4000–400 cm.–1 are examined and compared with those of the analogous triazoles. The assignment of the modes involving the N–O group is discussed.
TL;DR: A quantitative infrared procedure for the determination of iodochlorhydroxyquin and its intermediates is described, based on measurements of absorption in the 14.4 and 14.9 μ regions of a carbon disulfide solution of the compound.
TL;DR: An infrared study involving deuteration has shown that compounds previously designated as 5,6-dihydro-2-imino-1H, 4H-imidazo[4,5,1-ij]quinoline and 1,2-dioxioxine-4H-3, 1-benzoxazin-4-one exist predominantly as their amino-tautomers as discussed by the authors.
Abstract: An infrared study involving deuteration has shown that compounds previously designated as 5,6-dihydro-2-imino-1H, 4H-imidazo[4,5,1-ij]quinoline and 1,2-dihydro-2-imino-4H-3,1-benzoxazin-4-one exist predominantly as their amino-tautomers.
TL;DR: In this paper, the authors discuss the infrarated ABSORPTION SPECTROSCOPY for the MODAL ANALYSIS of the CONSTITUENTS of ROCKS is discussed.
Abstract: THE INFRARED ABSORPTION SPECTROSCOPY FOR THE MODAL ANALYSIS OF THE CONSTITUENTS OF ROCKS IS DISCUSSED. IT IS QUICKER THAN THE CUSTOMARILY USED POINT-COUNT METHOD. HOWEVER, IT PRESENTS THREE PROBLEMS: /1/ THE CHOICE OF A SUITABLE INTERNAL STANDARD, /2/ THE PROBLEM OF SAMPLE PREPARATION, AND /3/ THE COMPUTATION OF THE RESULTS. THE AUTHOR CONCLUDES THAT, WHILE THE METHOD HAS POSSIBILITIES, IT NEEDS FURTHER REFINEMENT BEFORE IT IS SUITABLE FOR A ROUTINE MODAL ANALYSIS. /SOURCE/