CXXXIV.—The ultra-violet absorption spectra of aromatic compounds. Part III. Disubstituted derivatives of benzene

1905 ◽  
Vol 87 (0) ◽  
pp. 1355-1360 ◽  
Author(s):  
Edward Charles Cyril Baly ◽  
Elinor Katharine Ewbank
Keyword(s):  
Absorption Spectra ◽  
Aromatic Compounds ◽  
Ultra Violet ◽  
Derivatives Of

scholarly journals Studies of co-ordination.—Part II. absorption spectra of metallic derivatives of benzoylcamphor

1931 ◽  
Vol 132 (820) ◽  
pp. 387-397 ◽  
Keyword(s):  
Absorption Band ◽  
Absorption Spectra ◽  
Preceding Paper ◽  
Ultra Violet ◽  
Cupric Ion ◽  
Metallic Salts ◽  
Infra Red ◽  
Acids And Bases ◽  
Definition Of ◽  
Derivatives Of

In the preceding paper of the present series on “Absorption Spectra and Co-ordination of some Cupric Compounds” observations were recorded of the absorption spectra, in the infra-red, visible and ultra-violet regions, of a series of metallic derivatives of copper, ranging from typical metallic salts, such as the blue aqueous sulphate and nitrate, through the blue-green acetate and its homologues, to the violet, yellow or brown derivatives of various β-diketones. In spite of the wide differences of colour in these compounds, the variations were found to be due to a mere displacement of a single absorption band, e. g ., from 9600 Å. U. in K 2 CuCl 4 to 6000 Å. U. in [Cu. 4NH 3 SO 4 , and the conclusion was drawn that the cupric ion in all these compounds exhibits a fourfold co-ordination, either with the anions of the salt or with molecules of the solvent. In the present paper analogous methods have been applied to the study of the metallic derivatives of benzoylcamphor. The investigation had its origin in a suggested correlation between the phenomena of dynamic isomerism in prototropic compounds and of co-ordination in their metallic derivatives. The former phenomenon was attributed, on the basis of an extended definition of acids and bases,† to the possibility of separating a proton from two alternative positions in the molecule, giving rise to two isomeric anions, which could be converted into one another through an intermediate multipolar ion, e. g ., HO.C=C─⇌ - O─C─C-⇌ - O─ + | | | | Enol. Enolic anion. C─ - C─⇌O=C─ - C─⇌O=C─C─ | | | | | | Multipolar ion. Ketonic anion. Ketone. H

scholarly journals The ultra-violet absorption spectra of blood sera

1916 ◽  
Vol 89 (617) ◽  
pp. 327-335 ◽  
Keyword(s):  
Clinical Practice ◽  
Absorption Spectra ◽  
Scientific Research ◽  
Ultra Violet ◽  
Research Fund ◽  
Absorption Bands ◽  
Pale Yellow ◽  
New Instrument ◽  
Visible Spectra ◽  
Derivatives Of

At the end of the year 1913 there was introduced a new kind of sector spectrophotometer designed especially for investigation of the ultra-violet spectrum. The possibility of applying the new instrument to the furtherance of medical and physiological science was soon appreciated by the author, and in conference with Dr. C. E. Wheeler it was decided that a study of the ultra-violet absorption spectra of blood sera might lead to results which would be both valuable to science and applicable to clinical practice. The proposal was placed before the Beit Research Fund Committee, the trustees of a fund which had been placed at the disposal of the British Homœopathic Association by Mr. Otto Beit for purposes of scientific research. The necessary support was liberally given by the Association, and still further funds are allotted for continuing the work. The absorption spectra of blood have engaged the attention of many able and distinguished workers, but the investigation has usually had reference to the visible spectra of hæmoglobin and other colourings and to derivatives of these. The work now to be described has for its object the investigation of the absorption spectra of blood sera in the ultra-violet region. The serum is freed as much as possible from corpuscles by the centrifuge, and the clear pale yellow liquid itself is studied with a view to determining the various characteristics of the absorption bands and to finding how these may be accounted for.

Infra-red and the Near Ultra-violet Absorption Spectra of Polypheny, Derivatives of the Elements of Groups IVb and Vb

Nature ◽  
1959 ◽  
Vol 183 (4673) ◽  
pp. 1475-1476 ◽  
Author(s):  
C. N. R. RAO ◽  
J. RAMACHANDRAN ◽  
M. S. C. IAH ◽  
S. SOMASEKHARA ◽  
T. V. RAJAKUMAR
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet ◽  
Infra Red ◽  
Derivatives Of

Multi-alkylated Polynuclear Aromatic Hydrocarbons of Tobacco Smoke: Separation and Identification

1978 ◽  
Vol 9 (4) ◽  
Author(s):  
M. E. Snook ◽  
R. F. Severson ◽  
R. F. Arrendale ◽  
H. C. Higman ◽  
O. T. Chortyk
Keyword(s):  
Liquid Chromatography ◽  
Cigarette Smoke ◽  
Aromatic Hydrocarbons ◽  
Ultra Violet ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Gel Chromatography ◽  
Cigarette Smoke Condensate ◽  
Gas And Liquid Chromatography ◽  
Silicic Acid Chromatography ◽  
Derivatives Of

AbstractThe methyl, multi-methyl, and ethyl derivatives of the polynuclear aromatic hydrocarbons (PAH) of cigarette smoke condensate (CSC) were isolated from the neutrals by silicic acid chromatography, solvent partitioning and gel chromatography. The procedure yielded a relatively pure PAH isolate amenable to further identifications. The multi-alkylated PAH were concentrated in the early gel fractions with parent and higher ring PAH found in subsequent gel fractions. It was shown that CSC is very rich in alkylated PAH, and their successful identification required extensive use of gas and liquid chromatography and ultra-violet and GC - mass spectrometric techniques. High-pressure liquid chromatography (HPLC) separated individual isomers of the alkylated PAH in complex GC peaks. PAH from indene to pentamethylchrysene were found. This report concludes our identification studies on the PAH of CSC and complements our two previous reports in this journal. Collectively, our studies have identified approximately 1000 PAH of cigarette smoke condensate and have led to the development of methods for the routine quantitation of PAH in smalI quantities of cigarette smoke condensate.

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