Oligophenylene 2,4,6-triarylpyridines and analogous diaza-p-terphenyls, diaza-p-quaterphenyls and diaza-p-quinquephenyls with luminiscent activity

1989 ◽  
Vol 54 (2) ◽  
pp. 462-472 ◽  
Author(s):  
Antonín Kurfürst ◽  
Pavel Lhoták ◽  
Miroslav Petrů ◽  
Josef Kuthan
Keyword(s):  
Spectral Region ◽  
Ammonium Acetate ◽  
Visible Spectral Region ◽  
Pyridinium Salts ◽  
Aromatic Ketones ◽  
Quaternary Pyridinium Salts

Cyclocondensation of α,β-unsaturated aromatic ketones V and VIII with quaternary pyridinium salts VI in the presence of ammonium acetate gave 2,4,6-triarylpyridines I, aryl-substituted diaza-p-terphenyls IIa,b, diaza-p-quaterphenyls IIc,d and diaza-p-quinquephenyls IIe,f. All the new polyphenylene compounds exhibit characteristic luminiscence in the visible spectral region.

The Synthesis and NMR Study of 2,4-Diaryl-6-(fluoren-2-yl)pyridines

1992 ◽  
Vol 57 (2) ◽  
pp. 375-384 ◽  
Author(s):  
Richard Hrabal ◽  
Pavel Lhoták ◽  
Antonín Kurfürst
Keyword(s):  
Ammonium Acetate ◽  
2D Nmr ◽  
Pyridinium Salts ◽  
Quaternary Pyridinium Salts ◽  
Nmr Study ◽  
Complete Assignment ◽  
Nmr Methods

The reaction of 2-cinnamoylfluorene II with quaternary pyridinium salts IIIa, IIIb in the presence of ammonium acetate, gave 2-fluorenyl-2,6-diarylpyridines IV. The complete assignment of 1H and 13C resonances by 2D NMR methods is given.

A new heterocyclic ring closure in ferricyanide oxidation of 2,4,6-triphenylpyridinium salts

1983 ◽  
Vol 48 (11) ◽  
pp. 3307-3314 ◽  
Author(s):  
Petr Nesvadba ◽  
Petr Štrop ◽  
Josef Kuthan
Keyword(s):  
Alkaline Solution ◽  
Heterocyclic Ring ◽  
Potassium Ferricyanide ◽  
Probable Mechanism ◽  
Ring Closure ◽  
Pyridinium Salts ◽  
Mechanism Of Formation ◽  
Pyrrole Derivatives ◽  
Quaternary Pyridinium Salts ◽  
Heterocyclic Derivatives

The quaternary pyridinium salts Ia-Ic react with alkaline solution of potassium ferricyanide to give the condensed heterocyclic derivatives IIIa, b, IV, whereas the salts Id-If give the pyrrole derivatives IIa-IIc under the same conditions. The diaza heterocycle IIIa reacts with methyl iodide to give methoiodide V, whereas by action of bromine it produces two monobromo derivatives VIa, b. The pyrrole derivatives IIa, b give monobromo derivatives IId, e on bromination. A probable mechanism of formation of the heterocyclic derivatives is discussed.

Sterically Crowded Heterocycles. III. A General Approach to Imidazo[1,2-a]pyridines by Ferricyanide Oxidation of Quaternary Pyridinium Salts

1996 ◽  
Vol 61 (1) ◽  
pp. 126-138 ◽  
Author(s):  
Richard Kubík ◽  
Stanislav Böhm ◽  
Iveta Ruppertová ◽  
Josef Kuthan
Keyword(s):  
Potassium Hydroxide ◽  
Potassium Ferricyanide ◽  
Pyridinium Salts ◽  
Oxidizing Agents ◽  
Quaternary Pyridinium Salts ◽  
Substituted 1

Substituted 1-(pyridin-2-yl)-2,4,6-triphenylpyridinium perchlorates 1b-1e were converted with potassium ferricyanide and potassium hydroxide to sterically crowded 2-phenyl-3-[(Z)-1,3-diphenyl-3-oxopropenyl]imidazo[1,2-a]pyridines 2b-2e accompanied by minor isomeric 2-benzoyl-3,5-diphenyl-1-(pyridin-2-yl)pyrroles 3c-3e. 4-Phenyl-2,6-di(4-substituted phenyl)-1-(pyridin-2-yl)pyridinium salts 4a, 4b gave exclusively corresponding imidazo[1,2-a]pyridines 5a, 5b while the ferricyanide oxidation of 1-(5-iodo- and 5-cyanopyridin-2-yl)-2,4,6-triphenylpyridinium perchlorates 6a, 6b led to mixtures of major imidazo[1,2-a]pyridines 7a-7c and minor pyrroles 8a-8c. Some mechanistic aspects of the oxidation procedure are discussed in connection with a resistance of 2,6-diphenyl-1,3,5-trimethylpyridinium perchlorate (9c) towards the oxidizing agents.

Effect of micelle formation of quaternary pyridinium salts on their recyclization to anilines

1981 ◽  
Vol 17 (4) ◽  
pp. 367-369 ◽  
Author(s):  
T. V. Stupnikova ◽  
A. I. Serdyuk ◽  
V. N. Kalafat ◽  
R. S. Sagitullin ◽  
V. P. Marshtupa
Keyword(s):  
Micelle Formation ◽  
Pyridinium Salts ◽  
Quaternary Pyridinium Salts

Collision-induced emission of singlet oxygen in the visible spectral region at temperatures of 90–315 K

2014 ◽  
Vol 116 (4) ◽  
pp. 542-547 ◽  
Author(s):  
M. V. Zagidullin ◽  
M. I. Svistun ◽  
N. A. Khvatov ◽  
A. S. Insapov
Keyword(s):  
Singlet Oxygen ◽  
Spectral Region ◽  
Visible Spectral Region

Excitonic Bands in the Optical Absorption Spectra of A3MX6 and A3M2X9 (A = MeNH3, Me2NH2, Me3NH, Me4N; M = Bi, Sb; X = Cl, Br, I)

1994 ◽  
Vol 49 (6) ◽  
pp. 849-851 ◽  
Author(s):  
G. C. Papavassiliou ◽  
I. B. Koutselas
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Spectral Region ◽  
Visible Spectral Region ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
Uv Visible ◽  
Low Dimensional

The title compounds (natural low-dimensional semiconductors) show strong excitonic optical absorption bands in the UV-visible spectral region, because of the dielectric confinement of excitons. as in the cases of other similar systems based on PbX2-4, SnX2-4. PtI - X - PtIV-X , Cdx,Sy-clusters etc

scholarly journals Tailoring the Photophysical Signatures of BODIPY Dyes: Toward Fluorescence Standards across the Visible Spectral Region

2018 ◽  
Author(s):  
Rebeca Sola Llano ◽  
Edurne Avellanal Zaballa ◽  
Jorge Bañuelos ◽  
César Fernando Azael Gómez Durán ◽  
José Luis Belmonte Vázquez ◽  
...  
Keyword(s):  
Spectral Region ◽  
Visible Spectral Region
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