908. Compounds of curcumin and boric acid. Part III. Infra-red studies of rosocyanin and allied compounds

The infra-red spectra of the Borate esters

Australian Journal of Chemistry ◽

10.1071/ch9550355 ◽

1955 ◽

Vol 8 (3) ◽

pp. 355 ◽

Cited By ~ 28

Author(s):

RL Werner ◽

KG O'Brien

Keyword(s):

Absorption Band ◽

Boric Acid ◽

Raman Spectra ◽

Raman Band ◽

Methyl Groups ◽

Group Comparison ◽

Trimethyl Borate ◽

Characteristic Absorption Band ◽

Infra Red ◽

High Degree

The infra-red spectra of a series of alkyl and aryl esters of boric acid have been obtained in the region from 1800 to 670 cm-1. These all show a strong characteristic absorption band at 1340 � 10 cm-1 which is assigned to the asymmetrical stretching frequency of the BO3 group. Comparison of the infra-red and Raman spectra of trimethyl borate suggests the assignment of the 728 cm-1 Raman band to the symmetrical stretching mode. The non-coincidence of infra-red and Raman bands indicates a fairly high degree of symmetry with restriction of the rotation of the methyl groups round the B-O link. This contrasts with other data on the behaviour in the vapour where such rotation may occur.

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The infra-red spectrum and structure of boric acid

Transactions of the Faraday Society ◽

10.1039/tf9555100009 ◽

1955 ◽

Vol 51 ◽

pp. 9 ◽

Cited By ~ 78

Author(s):

D. E. Bethell ◽

N. Sheppard

Keyword(s):

Boric Acid ◽

Infra Red

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Electron Microscopy of Human Gallstones

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100065523 ◽

1971 ◽

Vol 29 ◽

pp. 296-297

Author(s):

C. Wolpers ◽

R. Blaschke

Keyword(s):

Electron Microscopy ◽

Room Temperature ◽

Bile Pigment ◽

X Ray Diffraction ◽

Triclinic Crystal System ◽

X Ray ◽

Follow Up Study ◽

Infra Red ◽

Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

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