Infra-red spectra of compunds containing the Azo-group

1953 ◽  
Vol 6 (4) ◽  
pp. 341 ◽  
Author(s):  
JW Le Fevre ◽  
MF O'Dwyer ◽  
RL Werner
Keyword(s):  
Double Bond ◽  
Absorption Spectra ◽  
Rock Salt ◽  
Azo Group ◽  
Infra Red ◽  
Standard Deviations ◽  
Bond Region

Infra-red absorption spectra, over the rock-salt region, are reported for 43 substances believed to contain the -N=N- group. In the " double bond " region two common frequencies are noted, at 1406 and 1579 cm-1 (with standard deviations of �14 and � 9 cm-1 respectively). Since these may arise wholly or partly from vibrations of the aromatic or heterocyclic nuclei adjacent to the azo-linkages, the conclusion is drawn that N=N stretching modes, if active in absorption, are contributors to either or both of the bands at the points mentioned.

scholarly journals The absorption spectra of aragonite and strontianite in the near infra-red

1927 ◽  
Vol 116 (773) ◽  
pp. 140-152 ◽  
Keyword(s):  
Absorption Spectra ◽  
Rock Salt ◽  
Systematic Study ◽  
General Result ◽  
Infra Red ◽  
Experimental Side ◽  
Iron Manganese

In a series of papers dealing with some theoretical determinations of carbonate crystals, Chapman and his collaborators (1) have discussed a number of properties in calcite and magnesite, while later on they extend their work to the carbonates of zinc, iron, manganese and cadmium. They arrive at the general result that throughout the uni-axial series examined by them the CO 3 group remains almost unchanged in size. Their calculations yield a set of unique values for the rhombohedral angle, for which the limits are 101° 55' (calcite), and 103° 28' (calamine). In a similar way, the extremes in the size of the rhombohedral cell are shown by calcite and magnesite. Unfortunately these investigations have not yet embraced the bi-axial carbonates. On the experimental side, Schaefer and his school (2) have recently concluded a systematic study of the absorption spectra of the uni-axial crystals calcite, magnesite, dolomite, chalybite, and of the bi-axial crystals witherite and cerussite between the wave-lengths 1 and 23μ, accessible with prisms of quartz, fluorite, rock-salt and sylvite.

Infra-red absorption spectra of metal chelates derived from 8-hydroxyquinoline, 2-methyl-8-hydroxyquinoline, and 4-methyl-8-hydroxyquinoline

1956 ◽  
Vol 8 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Robert G. Charles ◽  
Henry Freiser ◽  
Robert Friedel ◽  
Leland E. Hilliard ◽  
William D. Johnston
Keyword(s):  
Absorption Spectra ◽  
Metal Chelates ◽  
Infra Red

scholarly journals I. On the influence of the molecular grouping in organic bodies on their absorption in the infra-red region of the spectrum

1881 ◽  
Vol 31 (206-211) ◽  
pp. 416-417
Keyword(s):  
Continuous Spectrum ◽  
Absorption Spectra ◽  
Infra Red ◽  
Electric Light ◽  
Molecular Grouping

The authors describe the apparatus used by them in their research and their plan of mapping the absorption spectra, the results being given in wave-lengths. The source of light for obtaining a continuous spectrum was the incandescent positive pole of an electric light, the electricity being generated by ah M. Gramme machine. The light was passed through tubes containing the fluid, and the absorption spectra photographed in the infra-red region.

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