Infrared and Raman spectra

Herzberg G 1945 Molecular Spectra and Molecular Structure II Infrared and Raman Spectra of Polyatomic Molecules (New York Van Nostrand-Reinhold)... 

Nakamoto K 1978 Infrared and Raman Spectra of Inorganic and Coordination Compounds 3rd edn (New York Wiley-Interscience)... 

Infrared and Raman spectra of A-4-thiazoline-2-thione and of isotopi-cally labeled derivatives (56. 59) were interpretated completely. (Table VII-41. 

Until 1962 the infrared and Raman spectra of thiazole in the liquid state were described by some authors (173, pp. 194-200) with only fragmentary assignments. At that date Chouteau et al. (201) published the first tentative interpretation of the whole infrared spectrum between 4000 and 650 cm for thiazole and some alkyl and haloderivatlves. They proposed a complete assignment of the normal modes of vibration of the molecule. 

The infrared and Raman spectra of many alkyl and arylthiazoles have been recorded. Band assignment and more fundamental work has been undertaken on a small number of derivatives. Several papers have been dedicated to the interpretation of infrared spectra (128-134, 860), but they are not always in agreement with each other. However, the work of Chouteau (99, 135) is noteworthy. The infrared spectrum of thiazole consists of 18 normal vibrations as well as harmonic and combination bands. 

Herzberg, G. (1990) Infrared and Raman Spectra, Krieger, Florida. 

Table 6.4 Fundamental vibration wavenumbers of crotonaldehyde obtained from the infrared and Raman spectra...

In addition to bands in the infrared and Raman spectra due to Au = 1 transitions, combination and overtone bands may occur with appreciable intensity, particularly in the infrared. Care must be taken not to confuse such bands with weakly active fundamentals. Occasionally combinations and, more often, overtones may be used to aid identification of group vibrations. 

What group vibrations would you hope to identify in the infrared and Raman spectra of... 

The ir spectmm of cyanamide exhibits an intense, poorly resolved doublet at 2225-2260 cm . The uv spectmm shows only weak absorption below 230 nm, with no maximum observable above 208 nm. Studies of the infrared and Raman spectra (3) support the /V-cyanoamine stmcture, H2N-C=N. 

G. Turrell. Infrared and Raman Spectra of Crystals. Academic, London,... 

Most values were taken from M. W. Chase, Jr., C. A. Davies, J. R. Downey, Jr., D. J. Frurip, R. A. McDonald, and A. N. Syverud, "JANAF Thermochemical Tables, Third Edition, J. Phys. Chem. Ref. Data, 14, Supplement No. 1, 1985. For the diatomic molecules, a few (in parentheses) came from G. Hertzberg, Molecular Spectra and Molecular Structure. I. Spectra of Diatomic Molecules, and II. Infrared and Raman Spectra of Polyatomic Molecules. Van Nostrand Reinhold Co., New York, 1950 and 1945. 

Although in the frequency region of the conventionally measured infrared and Raman spectra (400-4000 cm ) only intramolecular modes appear, some particular bands can be sensitive to intermolecular interactions typical of the different modes of packing of chains with identical conformations. 

Serebrennikov Y. A., Temkin S. I., Burshtein A. I. Infrared and Raman spectra of a linear rotator in the fluctuating liquid cage model, Chem. Phys. 81, 31-40 (1983). 

Table 6 Infrared and Raman spectra of Sg in the solid state and in CS2 solution at 20 °C with assignments according to [148, 149, 151]. Wavenumbers in cm relative intensities very strong-strong-medium-weak-very weak...

G. Herzberg, Molecular Spectra and Molecular Structure, Vol. II - Infrared and Raman Spectra of Polyatomic Molecules, Van Nostrand Reinhold, New York, 1945 In the crystalline state, it is more convenient to speak about multi-phonon processes since the modes from the whole dispersion range of the first Brillouin zone are allowed to contribute according to the conservation of energy and momentum of the phonons involved in the process... 

The infrared and Raman spectra of trisulfane have been assigned assuming a molecular C2 symmetry [58]. Due to strong coupling between bending and torsion modes the assignment given in Table 6 should be considered as only approximate. 

The infrared and Raman spectra of SgO [78] reflect the molecular structure. The SO stretching vibration gives rise to very strong IR absorptions at 1133 cm (CS2 solution) and at 1104 cm (CsCl disc) but to a weak Raman line at 1080 cm (all at 25 C). Since SgO is a strong oxidant, KBr discs should not be used (formation of sulfur bromides). The Raman hnes in the... 

Infrared and Raman spectra of 47f-pyran and 1,4-dioxin have been analysed <96JST255> and interconversion barriers for dihydropyrans and some dioxins have been determined <96BKS7>. 

Previous theoretical studies of isolated and doped PA have mostly dealt with geometrical structures and charge and spin wavess. A few have dealt with the vibrational spectrumS2i = using force fields derived from fits to experimental infrared and Raman spectra of smaller polyenes or from scaled force constants obtained from semi-empirical SCF calculations on these systems. Very little the-... 

The main investigation methods, to give information about structure and bonding in the halophosphates, are vibrational and NMR spectroscopy, which give a fairly complete picture. Up to now, X-ray studies are restricted to a few examples only indirectly they are of some importance in the discussion, especially of infrared and Raman spectra however. In some cases indirect information has been instructive, e.g. Mossbauer spectra of iron and tin halophosphates, so that these measurement shall be mentioned too. 

---