zwitterion formation
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2019 ◽  
Vol 6 (5) ◽  
pp. 190311 ◽  
Author(s):  
Huancong Shi ◽  
Min Huang ◽  
Yuandong Huang ◽  
Lifeng Cui ◽  
Linna Zheng ◽  
...  

The mechanism was proposed of heterogeneous catalytic CO 2 absorptions with primary/secondary amines involving ‘catalytic carbamate formation’. Compared with the non-catalytic ‘Zwitterion mechanism’, this Eley–Rideal model was proposed for CO 2 + RR′NH with MCO 3 (M = Ca, Mg, and Ba) with four elementary reaction steps: (B1) amine adsorption, (B2) Zwitterion formation, (B3) carbamate formation, and (B4) carbamate desorption. The rate law if determining step of each elementary step was generated based on ‘steady-state approximation’. Furthermore, the solid chemicals were characterized by SEM and BET, and this rate model was verified with 39 sets of experimental datasets of catalytic CO 2 –MEA absorptions with the existence of 0–25 g CaCO 3 , MgCO 3 and BaCO 3 . The results indicated that the rate-determining step was B1 as amine adsorption onto solid surface, which was pseudo-first-order for MEA. This was the first time that the Eley–Rideal model had been adopted onto the reactions of CO 2 + primary/secondary amines over alkaline earth metal carbonate (MCO 3 ).


2019 ◽  
Vol 21 (20) ◽  
pp. 10677-10692 ◽  
Author(s):  
Ya Wang ◽  
Yang Liu ◽  
Isaac B. Bersuker

We show that the intermediates of photochemical reactions—sudden polarization and zwitterion formations—are consequences of the pseudo-Jahn–Teller effect (PJTE), which facilitates a better understanding, rationalization, prediction, and manipulation of the corresponding chemical and biological processes.


CrystEngComm ◽  
2018 ◽  
Vol 20 (40) ◽  
pp. 6126-6132
Author(s):  
Pengyun Yue ◽  
Caiqiao Dong ◽  
Mingtao Zhang ◽  
Danrui Xu ◽  
Sean Parkin ◽  
...  

Structural isomerization of 2-anilinonicotinic acids to 4-anilinonicotinic acids leads to an increase of ΔpKa, thus leading to the formation of a carboxylate–pyridinium NH dimer in the solid state.


2017 ◽  
Vol 53 (89) ◽  
pp. 12132-12135 ◽  
Author(s):  
Julian Böhnke ◽  
Holger Braunschweig ◽  
Andrea Deißenberger ◽  
Theresa Dellermann ◽  
Rian D. Dewhurst ◽  
...  

The combination of electron-rich diaminoalkynes and ditopic Lewis acids diboranes(4) leads to unusual diboration reactions involving internal Lewis adduct and zwitterion formation and C–C bond formation.


Biochemistry ◽  
2014 ◽  
Vol 53 (37) ◽  
pp. 5930-5946 ◽  
Author(s):  
Alexander Paasche ◽  
Andreas Zipper ◽  
Simon Schäfer ◽  
John Ziebuhr ◽  
Tanja Schirmeister ◽  
...  

2012 ◽  
Vol 116 (44) ◽  
pp. 10721-10727 ◽  
Author(s):  
Isabelle Couturier-Tamburelli ◽  
Bintou Sessouma ◽  
Thierry Chiavassa ◽  
Nathalie Piétri
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