Über die Fluoreszenz organischer Verbindungen bei der Anregung durch Röntgenstrahlen

Neunhoeffer, Otto; Rosahl, Dietrich

doi:10.1002/bbpc.195300019

Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft

1953

DOI: 10.1002/bbpc.195300019

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Über die Fluoreszenz organischer Verbindungen bei der Anregung durch Röntgenstrahlen

Otto Neunhoeffer¹,

Dietrich Rosahl²

Abstract: Auf Grund experimenteller Ergebnisse wird gezeigt, daß die Fluoreszenz organischer Verbindungen bei der Anregung mit Röntgenstrahlen konstitutionsspezifisch und von der Wellenlänge der anregenden Strahlen abhängig ist.

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1956

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Aryl‐Δ²‐pyrazolines as Optical Brighteners

Wagner

Schellhammer

Petersen

1966

Angew. Chem. Int. Ed. Engl.

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conclusions based on the crystalline state to the dissolved state. A complex of this nature may be formed in one of two ways:I . The central cation reacts with monomers or small isopolyanions ; 2. The central cation reacts with the preformed isopolyanion.Only in the second case can reliable conclusions regarding the isopolyanion be based on the structure of the complex. Both reactions evidently are possible in the formation of hetero-com.plexes. Thus the fact that "true" metatungstate ions do not react with phosphoric acid shows very clearly that, for example, the dodecatungstatophosphate ion, which is similar to the true metatungstate ion 1541, can be formed in accordance with 1 ; it is formed on acidification of a solution containing monotungs:ate and phosphate ions. The complexes we have described, on the other hand, evidently are formed in accordance with 2, so that there is a direct relation between these complexes and the isopolyanions originally present in the solution. Some of the many reasons for this conclusion are: The formation of different complexes with cations from paratungstate solutions of the same concentration and pH but of different ages would not be understandable if the heterocomplexes were formed from fragments and not from the different polytungstate ions present in each case.True metatungstate ions and decavanadate ions are broken down only slowly in alkaline solutions. Since complex formation with these polyanions is instantaneous, it is hardly possible that it could proceed via fragments.The reaction of methyl red with molybdate in the ratio 1 : 12 could not be explained without assuming the prior existence of dodecamolybdate ions with cavities capable of accommodating the dye.We have attempted in this paper to outline, with the aid of some examples, the present state of research on polyacids, and to describe a number of new methods that have contributed to progress in this field. New insights into the chemistry of the polyacids will undoubtedly be gained in the future by the use of numerous and versatile chemical and physical methods, and by a logical combination of all the individual results.

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Aryl‐Δ²‐pyrazolines as Optical Brighteners

Wagner

Schellhammer

Petersen

1966

Angew. Chem. Int. Ed. Engl.

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Pyrazolo‐cumarine und Pyrazolyl‐cumarone

Mustafa

Hishmat

Nawar

et al. 1965

Justus Liebigs Ann. Chem.

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Die Pyrazolo-cumarine 111 sowie deren Hydrazone wurden aus 3-Acetyl-4-hydroxy-cumarin (I) und dem entsprechenden Hydrazin erhalten. Bei der Behandlung von 3-Acetyl-cumarin rnit Hydrazin tritt Entacylierung unter Bildung von Salicylaldazin ein. -Die Einwirkung von Hydrazin auf o-Acetokhellinon (VI a) bzw. auf o-Aceto-visnaginon (VI b) fiihrt zu 4.7-Dirnethoxy-5-[3(oder 5)-methyM(oder 3)-pyrazolyll-cumaron (VII a) bzw. zu der entsprechenden 4-Methoxy-6-hydroxy-Verbindung VII b. -Die Pyrazolin-Derivate XIV (bzw. Isomere) werden leicht durch Einwirkung der entsprechenden Hydrazine auf Styryl-Derivate von I erhalten.

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Notiz über 1‐Phenyl‐3‐(4‐alkoxyphenyl)‐Δ²‐pyrazoline

Jumar¹

1956

J. Prakt. Chem.

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Über die Fluoreszenz organischer Verbindungen bei der Anregung durch Röntgenstrahlen

Abstract: Auf Grund experimenteller Ergebnisse wird gezeigt, daß die Fluoreszenz organischer Verbindungen bei der Anregung mit Röntgenstrahlen konstitutionsspezifisch und von der Wellenlänge der anregenden Strahlen abhängig ist.

Cited by 3 publications

References 0 publications

Aryl‐Δ²‐pyrazolines as Optical Brighteners

Aryl‐Δ²‐pyrazolines as Optical Brighteners

Pyrazolo‐cumarine und Pyrazolyl‐cumarone

Notiz über 1‐Phenyl‐3‐(4‐alkoxyphenyl)‐Δ²‐pyrazoline

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Über die Fluoreszenz organischer Verbindungen bei der Anregung durch Röntgenstrahlen

Abstract: Auf Grund experimenteller Ergebnisse wird gezeigt, daß die Fluoreszenz organischer Verbindungen bei der Anregung mit Röntgenstrahlen konstitutionsspezifisch und von der Wellenlänge der anregenden Strahlen abhängig ist.

Cited by 3 publications

References 0 publications

Aryl‐Δ2‐pyrazolines as Optical Brighteners

Aryl‐Δ2‐pyrazolines as Optical Brighteners

Pyrazolo‐cumarine und Pyrazolyl‐cumarone

Notiz über 1‐Phenyl‐3‐(4‐alkoxyphenyl)‐Δ2‐pyrazoline

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Product

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Aryl‐Δ²‐pyrazolines as Optical Brighteners

Aryl‐Δ²‐pyrazolines as Optical Brighteners

Notiz über 1‐Phenyl‐3‐(4‐alkoxyphenyl)‐Δ²‐pyrazoline