Highly efficient enrichment mechanism of U(VI) and Eu(III) by covalent organic frameworks with intramolecular hydrogen-bonding from solutions

2020 ◽  
Vol 504 ◽  
pp. 144403 ◽  
Author(s):  
Xin Zhong ◽  
Wen Liang ◽  
Zhipeng Lu ◽  
Baowei Hu
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Covalent Organic Frameworks ◽  
Highly Efficient ◽  
Intramolecular Hydrogen

scholarly journals Intra-molecular Interactions in Porous Covalent Organic Frameworks

2014 ◽  
Vol 70 (a1) ◽  
pp. C530-C530
Author(s):  
Rahul Banerjee
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Molecular Interactions ◽  
Chemical Stability ◽  
Intramolecular Hydrogen Bonding ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
New Strategy ◽  
The Stability ◽  
Intramolecular Hydrogen

A new strategy of intramolecular hydrogen bonding in 2D covalent organic framework as an extra stabilizing factor has been introduced, which helps to improve the crystallinity, porosity and chemical stability of the COF. Using this concept, highly stable porphyrin containing covalent organic frameworks have been synthesized using the Schiff base reaction. The stability of the COFs mainly arises due to the strong intramolecular O-H...N=C hydrogen bonding. Validation of this postulate was cross-checked by synthesizing methoxy (OCH3) substituted COF in which no hyrogen bonding exists. It was found that methoxy substituted COF have a low crystallinity, porosity and chemical stability as compared to hydrogen bonded COF.

scholarly journals Intramolecular Hydrogen Bonding-Based Topology Regulation of Two-Dimensional Covalent Organic Frameworks

2020 ◽  
Vol 142 (30) ◽  
pp. 13162-13169 ◽  
Author(s):  
Yongwu Peng ◽  
Liuxiao Li ◽  
Chongzhi Zhu ◽  
Bo Chen ◽  
Meiting Zhao ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Intramolecular Hydrogen

Kinetic Studies on Guanidine-Superbase-Promoted Ring-Opening Polymerization of ε-Caprolactone

Synlett ◽  
2019 ◽  
Vol 30 (08) ◽  
pp. 928-931 ◽  
Author(s):  
Ruiting Yuan ◽  
Qinghui Shou ◽  
Qaiser Mahmood ◽  
Guangqiang Xu ◽  
Xitong Sun ◽  
...  
Keyword(s):  
Activation Energy ◽  
Hydrogen Bonding ◽  
Ring Opening ◽  
Kinetic Studies ◽  
Intramolecular Hydrogen Bonding ◽  
Ring Opening Polymerization ◽  
Highly Efficient ◽  
Intramolecular Hydrogen ◽  
Kinetics Of

The kinetics of the ring-opening polymerization of ε-caprolactone with butane-1,4-diol as the initiator and 1,5,7-triazabicyclo[4.4.0]dec-5-ene as catalyst were examined. A highly efficient and controllable polymerization of ε-caprolactone occurred with an activation energy of 22.5 kJ·mol–1, which is much lower than that observed with butan-1-ol as the initiator (39.5 kJ·mol–1). An intramolecular hydrogen-bonding-assisted mechanism is proposed to explain this lowering of the activation energy.

Theoretical study of intramolecular hydrogen bonding and molecular geometry of 2-trifluoromethylphenol

10.1002/jcc.2 ◽  
1996 ◽  
Vol 17 (16) ◽  
pp. 1804-1819 ◽  
Author(s):  
Attila Kov�cs ◽  
Istv�n Kolossv�ry ◽  
G�bor I. Csonka ◽  
Istv�n Hargittai
Keyword(s):  
Hydrogen Bonding ◽  
Theoretical Study ◽  
Molecular Geometry ◽  
Intramolecular Hydrogen Bonding ◽  
Intramolecular Hydrogen

Intramolecular Hydrogen Bonding Facilitates Electrocatalytic Reduction of Nitrite in Aqueous Solutions

2019 ◽  
Vol 58 (14) ◽  
pp. 9443-9451 ◽  
Author(s):  
Song Xu ◽  
Hyuk-Yong Kwon ◽  
Daniel C. Ashley ◽  
Chun-Hsing Chen ◽  
Elena Jakubikova ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Aqueous Solutions ◽  
Intramolecular Hydrogen Bonding ◽  
Electrocatalytic Reduction ◽  
Intramolecular Hydrogen

Seven-Membered Intramolecular Hydrogen Bonding of Phenols: Database Analysis and Phloroglucinol Model Compounds

2012 ◽  
Vol 2012 (24) ◽  
pp. 4483-4492 ◽  
Author(s):  
Ronald K. Castellano ◽  
Yan Li ◽  
Edwin A. Homan ◽  
Andrew J. Lampkins ◽  
Iris V. Marín ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Model Compounds ◽  
Database Analysis ◽  
Intramolecular Hydrogen
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