Stable Dimeric Aromatic Cation−Radicals. Structural and Spectral Characterization of Through-Space Charge Delocalization

2000 ◽  
Vol 65 (21) ◽  
pp. 6826-6836 ◽  
Author(s):  
Jay K. Kochi ◽  
Rajendra Rathore ◽  
Pierre Le Maguères
Keyword(s):  
Space Charge ◽  
Spectral Characterization ◽  
Charge Delocalization ◽  
Cation Radicals

Vicinal-diaryl interactions in stilbenoid hydrocarbons as observed in the through-space charge delocalization of their cation radicals

1999 ◽  
Vol 77 (5-6) ◽  
pp. 913-921 ◽  
Author(s):  
Rajendra Rathore ◽  
Jay K Kochi
Keyword(s):  
Space Charge ◽  
Cation Radical ◽  
Conformational Preference ◽  
Charge Delocalization ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cation Radicals ◽  
Near Ir ◽  
Aromatic Interactions ◽  
Vis Spectroscopy

The conformational preference of vicinal or 1,2-phenyl groups is probed in two classes of ring-substituted 1,2-diphenylbicyclooctene (stilbenoid) hydrocarbons 1a-1d and 2a-2c. UV-vis spectroscopy reveals, and X-ray crystallography verifies, the intramolecular (edge-to-face) orientation for the phenyl-phenyl interaction in stilbenoids 1a-1d. Most importantly, when two pairs of ortho-methyl substituents are present, the cofacial phenyl groups in the stilbenoid donors are established by X-ray crystallography and spectrally observed in the cation radicals (2a+.-2c+.) by the appearance of new bands with strong absorptions in the near IR with λmax = 1100-1315 nm, analogous to those previously observed in intermolecular (aromatic) interactions of aromatic cation radicals.Key words: stilbenoid hydrocarbon, cation radical, aryl-aryl interaction.

Optimized Synthesis and Spectral Characterization of Some Hydrazones Based on 5-Nitroindazole with Pharmacological Potential

2014 ◽  
Vol 59 (3) ◽  
pp. 313-318
Author(s):  
C. Cheptea ◽  
◽  
L.M. Ivan ◽  
D.O. Dorohoi ◽  
V. Sunel ◽  
...  
Keyword(s):  
Spectral Characterization ◽  
Pharmacological Potential

Synthesis and Spectral Characterization of Derivatives of Benzotriazole and Piperidine

2018 ◽  
Vol 8 (2) ◽  
pp. 278-287
Author(s):  
Selvarathy Grace P ◽  
Ravindran Durainayagam B ◽  
Pon Matheswari P.
Keyword(s):  
Spectral Characterization ◽  
Derivatives Of

Synthesis and Spectral Characterization of New S-Alkylated 1,2,4-Triazoles as Potential Biological Agents

2017 ◽  
Vol 68 (10) ◽  
pp. 2436-2439
Author(s):  
Stefania Felicia Barbuceanu ◽  
Laura Ileana Socea ◽  
Constantin Draghici ◽  
Elena Mihaela Pahontu ◽  
Theodora Venera Apostol ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Spectral Data ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Ethyl Bromide ◽  
Spectral Characterization ◽  
Basic Medium ◽  
Phenacyl Bromide

In the work we presented the behavior of 5-(4-(4-X-phenylsulfonyl)phenyl)-4-(n-propyl)-2H-1,2,4-triazole-3(4H)-thiones (X= Cl or Br) with some alkylation agents. Thus, new S-alkylated 1,2,4-triazole derivatives were synthesized by reaction of the corresponding 1,2,4-triazole-3-thione derivatives with different �-halogenated compounds (ethyl bromide, ethyl chloroacetate or phenacyl bromide), in basic medium. The structures of synthesized compounds were elucidated by spectral data (1H-NMR, 13C-NMR, mass spectrometry) and elemental analysis.

Spectral characterization of fungal diseases downy mildew, powdery mildew, black-foot and Petri disease on Vitis vinifera leaves

2021 ◽  
Vol 42 (15) ◽  
pp. 5680-5697
Author(s):  
Pâmela A. Pithan ◽  
Jorge R. Ducati ◽  
Lucas R. Garrido ◽  
Diniz C. Arruda ◽  
Adriane B. Thum ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Downy Mildew ◽  
Fungal Diseases ◽  
Spectral Characterization ◽  
Petri Disease ◽  
Black Foot
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