Inorganic compounds infrared

It must be very difficult for anyone graduating now to realize how little was known about organo-transition metal chemistry in 1937. We were taught the extraction of the metals from their ores, the properties of their oxides and simple salts in terms of the Periodic Law, and a very little complex chemistry. Although Departments of Physical Chemistry were well established, they were still young, and physical methods other than electrolytic methods found very little application in the study of complicated organic or inorganic compounds. Infrared spectrometers were sophisticated and temperamental instruments, applied mainly to... 

The two most useful supplementary techniques for the light microscope are EDS and FTIR microscopy. Energy dispersed x-ray systems (EDS) and Eourier-transform infrared absorption (ETIR) are used by chemical microscopists for elemental analyses (EDS) of inorganic compounds and for organic function group analyses (ETIR) of organic compounds. Insofar as they are able to characterize a tiny sample microscopically by PLM, EDS and ETIR ensure rapid and dependable identification when appHed by a trained chemical microscopist. 

Infrared absorption spectra can be employed for the identification of pure compounds or for the detection and identification of impurities. Most of the applications are concerned with organic compounds, primarily because water, the chief solvent for inorganic compounds, absorbs strongly beyond 1.5//m. Moreover, inorganic compounds often have broad absorption bands, whereas organic substances may give rise to numerous narrower bands. 

Why are inorganic compounds useful as sample windows and matrix material for infrared analysis ... 

Inorganic compounds consist of ionic bonds that do not absorb infrared light and therefore would present no interfering absorption bands. 

Nyquist, R. A., Kagel, R. O., Putzig, C. L, Leugers, M. A., Handbook of Infrared and Raman Spectra of Inorganic Compounds and Organic Salts (4 vols.). Academic Press, New York and London, 1996. 

K. Nakamoto, Infrared Spectra of Inorganic Compounds, 2nd ed., Wiley-Interscience, New York, 1970, pp. 259-260. 

R. A. Nyquist and R. O. Kagel In Infrared Spectra of Inorganic Compounds (3800-45cm 1), Academic Press INC San Diego, 1971, p 253. 

Nyquist RA, Kagel RO (1971) Infrared Spectra of Inorganic Compounds (3800-45 cm ). Academic Press, New York London... 

Infrared spectrophotometry is a powerful tool for identifying pure organic and inorganic compounds because, with the exception of a few homonuclear molecules such as O2, N2, and CU, all molecular species absorb infrared radiation. In addition, with the exception of chiral molecules in the crystalline state, each molecular species has a unique infrared absorption spectrum. Thus, an exact match between the spectrum of a compound of known structure and the spectrum of an analyte unambiguously identifies the analyte. 

Infrared and Raman Spectra of Inorganic Compounds ", K. Nakamoto, Wiley, New York, 1987. 

Fourier transform infrared spectroscopy (FT-IR) is useful for identifying organic and inorganic compounds by comparison with library references. Perkin Elmer System 2000 offers near IR, mid IR, far IR 15,000-15,030 cm, transmittance (T), specular reflectance (SR Ref. 6) and diffuse reflectance (DR), horizontal and vertical attenuated total reflectance (ATR) microscope (>10-gm spot, 10,000-10,580 cmy ... 

J. A. Gadsden, Infrared Spectra of Minerals and Related Inorganic Compounds, Butter-worth, London, 1975. 

Andrews and co-workers have used the matrix reaction between lithium atoms and some inorganic compounds to produce species of spectroscopic interest. Reaction of lithium with molecular oxygen [301] produces, in addition to the molecule Li02, the molecule LiO and a dimer Li2 02. Reaction with nitric oxide produced a nitroxide compound [302], but analysis of the infrared spectrum indicated that in this compound the lithium atom was bound to the oxygen atom (LiON), rather than to the nitrogen atom (LiNO), as would be expected by analogy with the known compounds HNO and RNO. The matrix deposition of lithium and nitrous oxide [303] leads to the formation of LiO and LijO. The other alkali metals have also been reacted in the same way with nitrous oxide [304]. Potassium, rubidium and caesium all led to the formation of the compounds MO and M2O. No sodium oxides were produced when sodium and nitrous oxide were co-deposited. This is to be compared with the mechanism advanced for the sodium-catalysed gas-phase reaction between N2O and CO, where sodium is assumed to react with N2O, (Section 4, ref. 

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