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Volume 36 (1973)
- Issue 6 Pages 339-
- Issue 5 Pages 271-
- Issue 4 Pages 219-
- Issue 3 Pages 153-
- Issue 2 Pages 73-
- Issue 1 Pages 5-
Volume 36, Issue 6
Displaying 1-4 of 4 articles from this issue
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Toshio TANAKA1973 Volume 36 Issue 6 Pages 339-345
Published: November 30, 1973
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA review is made on the present status of researches on spectral absorptions of silver particles of atomic, molecular and colloidal dispersions. Atomically dispersed silver is stable only in solid matrices and gives color centers such as B-centers in alkali halides. Diatomic silver molecules have been identified spectroscopically in vapor phase, and their properties constitute the basis, of quantum-chemical deductions on existence and properties of polyatomic silver molecules which have not yet been identified experimentally. Extensive studies have been made on color tones of colloidal silver. The absorption peak of colloidal silver in visible region generally shifts toward longer wavelengths and eventually becomes broader with increasing size, deviation from spherical shape, degree of impurity and extent of aggregation of the particles as well as with increasing refractive index of surrounding media. Trials have also been made to study the photolysis of silver salts in terms of spectral absorptions of silver particles produced. Some of these studies including the author's are described briefly.View full abstractDownload PDF (1172K) -
Spectral Color Matching by Nonlinear OptimizationNoboru OHTA1973 Volume 36 Issue 6 Pages 346-348
Published: November 30, 1973
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn the previous paper, the author has established the computer algorithm of spectral color matching in density scale. This method, however, sometimes gives large errors when the degree of spectral color matching is estimated in transmittance scale. Here, the author shows the computer algorithm of spectral color matching in transmittance scale by means of nonlinear optimization technique. Some practical approximations are also demonstrated.View full abstractDownload PDF (364K) -
Syntheses of α, α, α-Tribromoacetophenone Derivatives and the Change of their Infrared Spectra upon Extend of Bromination of the Corresponding KetonesKunihiro IKARI, Hiromi YOSHIDA, Tomomichi TSUKADA1973 Volume 36 Issue 6 Pages 349-358
Published: November 30, 1973
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSα, α, α-Tribromoacetophenone derivatives are well synthesized with reference to the method in USP 3, 121, 633 and the literature by Krönke.
We are very much interested in the spectroscopic shifts occuring with the bromination of acetophenone.
Some spectroscopic shifts and their explanations are as follow;
1. 16-20 cm-1 shift of carbonyl stretching frequency to higher wavenumber is observed when α-position of the ketone is substituted by a bromine atom. In this case, no change of proton magnetic resonance shift with the benzene ring proton is observed.
2. In the solution of mono- and di-bromine substituted ketone, a couple of carbonyl stretching bands and bromine linkage bands are shown. These phenomena are well explained by the existence of two stable rotational isomers at room temperature. More stable and more polar structure of the isomers is discussed.View full abstractDownload PDF (1265K) -
Akira HIRATA, Satoru HOHNISHI1973 Volume 36 Issue 6 Pages 359-365
Published: November 30, 1973
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSSilver halide microcrystals of photographic emulsion have different crystallographic faces, depending upon their preparation conditions. The change in crystal habit affects properties of photosensitive material to considerable extents. Studies in this field was stimulated by using monodisperse emulsion grains having definite crystal shapes. The increased knowledge in the last decade was reviewed.View full abstractDownload PDF (3294K)
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