Synthesis, characterization, crystal structure and solution studies of a novel proton transfer (charge transfer) complex of 2,2′-dipyridylamine with 2,6-pyridine dicarboxylic acid

2015 ◽  
Vol 1089 ◽  
pp. 184-190 ◽  
Author(s):  
Khaled Ghasemi ◽  
Ali Reza Rezvani ◽  
Ardeshir Shokrollahi ◽  
Fereshteh Zarghampour ◽  
Abolghasem Moghimi ◽  
...  
2021 ◽  
Author(s):  
Hosea M. Nelson ◽  
Juno C. Siu ◽  
Ambarneil Saha ◽  
Duilio Cascio ◽  
Samantha N. MacMillan ◽  
...  

Author(s):  
Hosea Nelson ◽  
Juno Siu ◽  
Ambarniel Saha ◽  
Duilio Cascio ◽  
Song-Bai Wu ◽  
...  

Recent advances in radical-based catalytic reactions have created an increasing demand for the understanding of their mechanistic underpinnings. Structural elucidation of transient reactive intermediates via diffraction techniques, though rarely possible, is one of the most decisive ways to support such mechanistic hypotheses. Here we present the isolation, structural elucidation, and theoretical analysis of an electrochemically generated and catalytically relevant charge-transfer species formed between the azidyl radical and (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO). The unusual bent N–N–N angle and the pancake bonding between these two fragments highlight the weak bonding interactions present in this complex. This X-ray structure validates computational predictions as well as mechanistic proposals of TEMPO-mediated radical azidation reactions.


2001 ◽  
pp. 1398-1399 ◽  
Author(s):  
Hirofumi Yoshikawa ◽  
Shin-ichi Nishikiori ◽  
Kinga Suwinska ◽  
Roman Luboradzki ◽  
Janusz Lipkowski

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