scholarly journals Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions

2016 ◽  
Vol 52 (64) ◽  
pp. 9941-9944 ◽  
Author(s):  
Ya Hu ◽  
Niall Goodeal ◽  
Ying Chen ◽  
Alex M. Ganose ◽  
Robert G. Palgrave ◽  
...  
Keyword(s):  
Schiff Base ◽  
Chemical Structure ◽  
Covalent Organic Frameworks ◽  
Condensation Reactions

XPS and STM analysis shows that covalent links formed within a surface-supported Schiff-base 2D-COF consist of a mixture of imine and hemiaminal groups.

scholarly journals Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

2016 ◽  
Vol 45 (20) ◽  
pp. 5635-5671 ◽  
Author(s):  
José L. Segura ◽  
María J. Mancheño ◽  
Félix Zamora
Keyword(s):  
Schiff Base ◽  
Organic Molecules ◽  
Covalent Organic Frameworks ◽  
Condensation Reactions ◽  
Synthesis Properties ◽  
Potential Applications

Covalent organic-frameworks (COFs) are an emerging class of porous and ordered materials formed by condensation reactions of organic molecules.

Study of Physico-chemical Characteristics and Pharmacological Effects of 1-Ethyl-Salicyldene-bis-Ethylene-Diamine and Its Complex with Mn(II)

2019 ◽  
Vol 70 (7) ◽  
pp. 2534-2537
Author(s):  
Gladiola Tantaru ◽  
Mihai Apostu ◽  
Antonia Poiata ◽  
Mihai Nichifor ◽  
Nela Bibire ◽  
...  
Keyword(s):  
Schiff Base ◽  
Chemical Structure ◽  
Antimicrobial Activities ◽  
Ethylene Diamine ◽  
Chemical Characteristics ◽  
Gram Negative Bacteria ◽  
Pharmacological Effects ◽  
Physico Chemical ◽  
Anti Inflammatory ◽  
Inflammatory Effect

The paper presents the synthesis of a new complex combination of a Bis-Schiff base with Mn(II) ions with great potential for antimicrobial and anti-inflammatory activity. A new complex of the Salen-type ligand, 1-ethyl-salicylidene-bis-ethylene diamine was synthetized using Mn(II) ions. The chemical structure was confirmed through 1H-NMR and IR spectroscopy. The antimicrobial activities of the Bis-Schiff base and its complex were tested in comparison with Ampicillin, Chloramphenicol, Tetracycline, Ofloxacin and Nystatin. Those compounds were found to be active against Gram-positive or Gram-negative bacteria, and had an anti-inflammatory effect comparable to that of Indomethacin.

Study on the nematicidal activity and chemical structure of NO bidentate Schiff base some metal complexes

2019 ◽  
Vol 67 (4) ◽  
pp. 610-622
Author(s):  
Mohamed S. El‐Attar ◽  
Nosa S. Abd El‐Lattif ◽  
Sadeek A. Sadeek
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Chemical Structure ◽  
Nematicidal Activity

scholarly journals Constructing covalent organic frameworks in waterviadynamic covalent bonding

IUCrJ ◽  
2016 ◽  
Vol 3 (6) ◽  
pp. 402-407 ◽  
Author(s):  
Jayshri Thote ◽  
Harshitha Barike Aiyappa ◽  
Raya Rahul Kumar ◽  
Sharath Kandambeth ◽  
Bishnu P. Biswal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Covalent Bonding ◽  
Porous Polymers ◽  
Porous Structures ◽  
Covalent Organic Frameworks ◽  
Synthetic Route ◽  
Dynamic Covalent Chemistry ◽  
Water Based ◽  
First Time ◽  
Reaction In Water

The formation of keto-enamine based crystalline, porous polymers in water is investigated for the first time. Facile access to the Schiff base reaction in water has been exploited to synthesize stable porous structures using the principles of Dynamic Covalent Chemistry (DCC). Most credibly, the water-based Covalent Organic Frameworks (COFs) possess chemical as well as physical properties such as crystallinity, surface area and porosity, which is comparable to their solvothermal counterparts. The formation of COFs in water is further investigated by understanding the nature of the monomers formed using hydroxy and non-hydroxy analogues of the aldehyde. This synthetic route paves a new way to synthesize COFs using a viable, greener route by utilization of the DCC principles in conjunction with the keto–enol tautomerism to synthesize useful, stable and porous COFs in water.

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.

Isomeric Routes to Schiff-Base Single-layered Covalent Organic Frameworks

Small ◽  
2014 ◽  
Vol 10 (23) ◽  
pp. 4934-4939 ◽  
Author(s):  
Xuan-He Liu ◽  
Yi-Ping Mo ◽  
Jie-Yu Yue ◽  
Qing-Na Zheng ◽  
Hui-Juan Yan ◽  
...  
Keyword(s):  
Schiff Base ◽  
Covalent Organic Frameworks
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