On the Association of Condensed Polycyclic Aromatic Compounds in Concentrated Sulfuric Acid

スポンサーリンク

概要

• 論文の詳細を見る

• The effect of the concentration on the absorption spectra of condensed polycyclic aromatic hydrocarbons and their related carbonyl derivatives in concentrated surfuric acid was studied in the concentration range from 10<SUP>－6</SUP>to 10<SUP>－3</SUP> mol. per liter. The free energies and heats of formation of these associates were also measured.<BR>In the case of the dibenzopyrene molecule in 96 per cent sulfuric acid, it is observed that various kinds of association, such as 8, 16 etc., were obtained in successive steps with the increase in the concentration of the solute, while in the case of carbonyl derivatives, only one kind of associate was observed, the number of degree of association of which was observed to be 2, 4 and 16.<BR>In the case of dibenzopyrene in 96 per cent sulfuric acid, where it is believed to be doubly protonated, the cause of association might be explained by the dispersion effect, while the blue-shift of the absorption peak of the monomer is clearly observed in successive steps succession with the increase in the concentration of the solute.<BR>However in the case of carbonyl derivatives and dibenzopyrene in 86 per cent sulfuric acid, where they are singly protonated, it is observed that they do not show any blue-shift of their absorption peaks but a lowering of the extinction coefficient.<BR>As is illustrated in Table I, their experimental heat of association may possibly not be explained by the dispersion effect alone. It may be necessary to take into consideration some kind of hydrogen-bonding between the carbonyl oxygen atoms and the proton.

• 社団法人 日本化学会の論文

著者

• HANDA T.

  Department of Inter. Med.

• Handa Takashi

  Department of Chemistry Faculty of Science The University of Tokyo

関連論文

• Primary Ewing's Sarcoma of the Skull Base with Intracerebral Extension : Case Report
• Intravascular Surgery for Cerebral Aneurysm : Indications and Limitations
• Vascular Endoscopy for Intravascular Surgery : An Experimental Study
• 194) Renal Function in Glomerulonephritis (9) : A STUDY ON EXPERIMENTAL GLOMERULONEPHRITIS(Proceedings of the 24th Annual Meeting, The Japanese Circulation Society [Part III])
• Heats of Sublimation of Condensed Polynuclear Aromatic Hydrocarbons
• On the Association of Condensed Polycyclic Aromatic Compounds in Concentrated Sulfuric Acid
• On the Basicities of the Nitro-derivatives of Benzoanthrones
• Solid phase synthesis of crystalline protected penta-L-tryptophan methyl esters.

スポンサーリンク