The Periodides of Acid Amides and Their Addition Products With Metallic Salts. Substances of Exceptionally High Molecular Weight.

Moore, Fiona; Thomas, Ruth M.

doi:10.1021/ja02186a016

J. Am. Chem. Soc.

1914

DOI: 10.1021/ja02186a016

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The Periodides of Acid Amides and Their Addition Products With Metallic Salts. Substances of Exceptionally High Molecular Weight.

Fiona Moore¹,

Ruth M. Thomas²

Abstract: Judging from the above observations, it seems likely that nature makes use of comparatively few basal coloring substances with which to produce many different colors by means of slight chemical changes. These substances are generally acid, sometimes neutral in character, and generally change color in acids and alkalies, alternately, acting as indicators. It is noticeable also that many of them are very sensitive to the action of light and air. The faintly colored alcoholic solutions of the Rose or the Perennia… Show more

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Cited by 6 publications

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Über Perjod‐alkali‐Salze mit organischen Neutralteilen

Schmidt¹

1928

Ber. dtsch. Chem. Ges. A/B

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1928)] Xchrni d t : Perjod-alkali-Xalze mit organischen Neutralteilen. 1347 die endgiiltigen Potentiale nur langsam, bei erhohter Temperatur geht die Titration dagegen sehr schnell. Die fiinfte Kolumne der Tabelle zeigt die Resultate der Titration von 5 ccm M/,,-As,O,-Losung bei 70,. Der Potentialsprung, welcher dem Ablenkungspunkt entspricht, ist sehr plotzlich und dementsprechend klar zu erkennen; er liegt bei ungefahr 150 Millivolt. Die Reaktion tritt bei 20 ccm Cerisulfat ein, also nach dem Schema: Die Methode gibt sehr gute Resultate, wenn man bei erhohten Tempe-As,03 + 4 (SO,) ,Ce + z H,O -+ z (SO,) ,Ce2 + As,O, + 2 S0,H2. raturen und in stark sauren Losungen arbeitet. E l e k t r o -t i t r i m e ' t r i e d e r K a t i o n e n Sn++ u n d Ti+++. Die Resultate, die wir erhielten, haben nur einen qualitativen Wert, und zwar wegen der groDen Leichtigkeit, mit welcher die betr. Salze sich an der Luft oxydieren. Fur das Kation Sn++ in stark salzsaurer Losung wird der Umschlagspunkt durch einen Punkt mit einer Ablenkung von iiber 300 Millivolt bezeichnet. Die Reaktion geht sehr schnell selbst bei gewohnlicher Temperatur. Fur das Kation Ti+++ verluft die Reaktion in salzsaurer Losung ebenfalls schnell, aber der Ablenkungspunkt ist weniger ausgepragt. Um iibereinstimmende Resultate zu erhalten, muD man immer mit frischen Losungen und unter AusschluB der Luft arbeiten. SchluDf olgerungen. Die erhaltenen Resultate veranlassen uns zu folgern : Die potentiometrische Methode verfiigt in dem Cerisulfat iiber ein sehr energisches und sehr brauchbares Reagens fur Oxydationsreaktionen. Diese Eigenschaften werden noch verstarkt durch eine hochst bemerkenswerte Unempfindlichkeit der auf M/lo-M/~oo verdiinnten Losungen f iir P u k e physikalische Einfliisse und fur chemische Agenzien, welche die Titrationen mit Permanganat so leicht fehlerhaft machen. Wir haben diese Angaben sichergestellt durch die Resultate, die wir bei den elektrometrischen Titrationen von Nitriten, Oxalsaure, Ferrocyaniden und Hydroperoxyd, sowie der Kationen Fe++, As+++, Sn++ und Ti+++ erhalten haben.

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Über Perjod‐alkali‐Salze mit organischen Neutralteilen

Schmidt¹

1928

Ber. dtsch. Chem. Ges. A/B

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Mössbauer Effect in CsI3 and Tri-iodide Complexes of Benzamide and Amylose

Ehrlich

Kaplan

1969

The Journal of Chemical Physics

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Mössbauer resonance experiments have been carried out at 4.2°K on CsI3 and the tri-iodide complexes of benzamide and amylose. The data unambiguously demonstrate the existence of inequivalent iodine atoms in the tri-iodide ions of each species. For all three compounds, the quadrupole couplings of the central iodines are similar and indicate a small positive charge on the atom. The terminal iodine atoms are negatively charged, and in CsI3 are significantly different from those in the benzamide and amylose complexes. The close relationship between the Mössbauer spectra of benzamide–HI3 and amylose–I3 supports a similar configuration of the tri-iodide ions in these helical complexes, as predicted by a previous model of the blue starch–iodine complex.

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Optical Spectra of Benzamide—Triiodide Ion Complexes : A Model of the Starch—Iodine Complex

Robin¹

1964

The Journal of Chemical Physics

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Earlier work has shown that the chromophoric group in the HI3·2C6H5CONH2 complex is an infinite chain of triiodide ions linked end to end, and the close similarity of the spectra of the benzamide—triiodide complexes and the blue starch—iodine complex strongly suggests that such a chain is also the chromophore in the latter. The electronic spectrum of such a one-dimensional chain of triiodide ions is explained by first assigning the transitions in the free triiodide ion and then assuming an excitonlike coupling of these transitions in the chain. The two well known transitions of the free triiodide ion at 28 300 and 34 800 cm—1 are assigned as antibonding pi to antibonding sigma and bonding pi to antibonding sigma, respectively. The high intensity of the pi to sigma bands results from a mixing of pi and sigma orbitals due to the supposed nonlinearity of the free ion. Electrostatic coupling of the strong, long-axis pi to sigma transitions then leads to a semiquantitative understanding of the number of bands in the polymeric triiodide spectrum as well as their polarizations, intensities, and frequencies.

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The Periodides of Acid Amides and Their Addition Products With Metallic Salts. Substances of Exceptionally High Molecular Weight.

Cited by 6 publications

References 0 publications

Über Perjod‐alkali‐Salze mit organischen Neutralteilen

Über Perjod‐alkali‐Salze mit organischen Neutralteilen

Mössbauer Effect in CsI3 and Tri-iodide Complexes of Benzamide and Amylose

Optical Spectra of Benzamide—Triiodide Ion Complexes : A Model of the Starch—Iodine Complex

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