Influence of substituents on the nitrogen atom of 3-[2-(4-aminophenyl)benzoxazol-5-yl]alanine derivatives on their photophysical properties - solvatochromic studies

2011 ◽  
Vol 10 (10) ◽  
pp. 1610 ◽  
Author(s):  
Katarzyna Guzow ◽  
Agnieszka Ceszlak ◽  
Marta Kozarzewska ◽  
Wiesław Wiczk
Keyword(s):  
Nitrogen Atom ◽  
Photophysical Properties ◽  
Influence Of Substituents

Synthesis and Photophysical Properties of 1,4-Dihydro-2H,5H-chromeno[4,3-d][1,3]oxazin-5-ones, and Derivatives Containing Tethered 1,2,3-Triazoles, from 4-Aminocoumarins

Synthesis ◽  
2019 ◽  
Vol 51 (15) ◽  
pp. 2965-2976
Author(s):  
Marina C. Dilelio ◽  
Nathan P. Brites ◽  
Larissa A. Vieira ◽  
Bernardo A. Iglesias ◽  
Teodoro S. Kaufman ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Click Chemistry ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
One Pot ◽  
Alkyl Aryl ◽  
Triazole Derivatives ◽  
High Quantum ◽  
Stokes Shifts

A facile protocol for the unprecedented one-pot H2SO4-mediated hydroxymethylation/cyclative N,O-acetalization of 4-aminocoumarins to 1,4-dihydro-2H,5H-chromeno[4,3-d][1,3]oxazin-5-ones, in moderate to good yields, was developed and optimized. The scope and limitations of the transformation, which takes place in water or water/THF mixtures, were also studied. The nitrogen atom of the resulting tricycles was used to tether alkyl, aryl and 1,2,3-triazolylmethyl moieties, employing a two-step click chemistry approach for the latter. The photophysical properties of the heterocycles, as well as of their 1,2,3-triazole derivatives, were also examined. The N-aryl derivatives exhibited high quantum yields of fluorescence (up to Φf = 0.69) and very large Stokes shifts (up to 201 nm).

scholarly journals Carborane–stilbene dyads: the influence of substituents and cluster isomers on photoluminescence properties

2017 ◽  
Vol 46 (7) ◽  
pp. 2091-2104 ◽  
Author(s):  
A. Ferrer-Ugalde ◽  
J. Cabrera-González ◽  
E. J. Juárez-Pérez ◽  
F. Teixidor ◽  
E. Pérez-Inestrosa ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Carbon Cluster ◽  
Photoluminescence Properties ◽  
Cluster Atom ◽  
Influence Of Substituents

A family of stilbene-containing meta- and ortho-carborane derivatives substitute at the second carbon cluster atom are synthesised and their photophysical properties evaluated.

Structural Properties of Ruthenium Biimidazole Complexes Determining the Stability of their Supramolecular Aggregates

2010 ◽  
Vol 65 (3) ◽  
pp. 281-290 ◽  
Author(s):  
Nils Rockstroh ◽  
Katrin Peuntinger ◽  
Helmar Görls ◽  
Dirk M Guldi ◽  
Frank W. Heinemann ◽  
...  
Keyword(s):  
Structural Properties ◽  
Ruthenium Complex ◽  
Photophysical Properties ◽  
Visible Range ◽  
X Ray ◽  
Bond Lengths ◽  
Amine Function ◽  
The Stability ◽  
Supramolecular Aggregates ◽  
Influence Of Substituents

The results of a detailed investigation of the influence of substituents in a variety of ruthenium biimidazole-type complexes [Ru(R-bpy)2(R´-bi(bz)imH2)]2+ (R = H, tBu; R´ = H,Me; bi(bz)imH2 = 2,2´-bi(benz)imidazole) on selected structural and photophysical properties is reported. The photophysical properties are only marginally influenced by the substituents at the bipyridine and the biimidazole core. All complexes show intense absorptions in the visible range of the spectrum with maxima around 475 nm, and emission from the formed excited state occurs at wavelengths between 650 and 670 nm. The comparison of structural properties determined by X-ray analysis within a series of related complexes shows that the Ru-N bond lengths to the coordinated bipyridines are not significantly influenced by the substituents, but slight differences in the Ru-N bond lengths to the biimidazole-type ligands can be detected. The reactions between ruthenium complexes containing different biimidazole-type ligands with the sulfate dianion, however, show a strong correlation between the substituents at the biimidazole core and the solubility of the product. The bibenzimidazolecontaining complexes precipitate from aqueous solution whereas the ruthenium complex containing unsubstituted biimidazole stays in solution. The solid-state structure of one example of the sulfatecontaining products (2b) shows that strong hydrogen bonds between the secondary amine function of the bibenzimidazole and the oxygen functionalities of the sulfate contribute to this unexpected behavior.

Influence of substituents in the phenyl ring on photophysical properties of 3-[2-(phenyl)benzoxazol-5-yl]alanine derivatives

2005 ◽  
Vol 175 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Katarzyna Guzow ◽  
Justyna Zielińska ◽  
Kamil Mazurkiewicz ◽  
Jerzy Karolczak ◽  
Wiesław Wiczk
Keyword(s):  
Phenyl Ring ◽  
Photophysical Properties ◽  
Influence Of Substituents

Influence of substituents at the nitrogen atom on the intramolecular interactions in 2,6-dimethyl-4-hydroxy-1,2,3,4- tetrahydroquinolines

1974 ◽  
Vol 21 (1) ◽  
pp. 980-982
Author(s):  
L. P. Zalukaev ◽  
A. M. Meleshina ◽  
N. F. Strel'nikova ◽  
M. V. Kopytina ◽  
V. M. Savvinova
Keyword(s):  
Nitrogen Atom ◽  
Intramolecular Interactions ◽  
Influence Of Substituents
Sign in / Sign up

Export Citation Format

Share Document