Covalent organic framework based on melamine and dibromoalkanes for versatile use

Covalent organic frameworks (COFs), based on melamine and dibromoalkanes [Br(CH 2 ) n Br] with n = 2, 4, 6, and 8 for 1,2-dibromoethane, 1,4-dibromobutane, 1,6-bibromohexane and 1,8-dibromooctane as COF-1,2, COF-1,4, COF-1,6, COF-1,8, were synthesized in dimethyl sulfoxide at 150 °C. The COFs had di...

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Bibliographic Details
Published in:Journal of porous materials 2016-08, Vol.23 (4), p.1025-1035
Main Authors: Sahiner, Nurettin, Demirci, Sahin, Sel, Kivanc
Format: Article
Language:English
Subjects:
Atomic properties
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cobalt
Composite materials
Covalence
Dimethyl sulfoxide
Emissions control
Ethanol
Fluorescence
Hydrogen production
Hydrolysis
Melamine
Nanoparticles
Nanostructure
Physical Chemistry
Thermal conductivity
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Summary:Covalent organic frameworks (COFs), based on melamine and dibromoalkanes [Br(CH 2 ) n Br] with n = 2, 4, 6, and 8 for 1,2-dibromoethane, 1,4-dibromobutane, 1,6-bibromohexane and 1,8-dibromooctane as COF-1,2, COF-1,4, COF-1,6, COF-1,8, were synthesized in dimethyl sulfoxide at 150 °C. The COFs had distinct color depending on the number of C atoms (n) in the dibromoalkanes e.g., light-yellow, intense yellow, brown and dark brown for COF-1,2, COF-1,4, COF-1,6, and COF-1,8, respectively. Furthermore, it was demonstrated that COF-1,2 and COF-1,4 COFs can be used as a template for in situ Co metal nanoparticle preparation by loading CoCl 2 salt from ethanol solution into COFs and then treating with NaBH 4 solution. Then the prepared catalyst systems of COF-1,2-Co and COF-1,4-Co were tested for H 2 generation from hydrolysis of NaBH 4 . The COF-1,2-Co composite materials showed better catalyst performance than COF-1,4-Co composite in the hydrolysis of NaBH 4 . The hydrogen generation rates (HGR) and turnover frequency values were calculated as 1589 and 594 ml H 2 /(g of catalyst) × (min) HGR values, and 3.75 and 1.41 mol H 2 /(mol catalyst min) for COF-1,2-Co and COF-1,4-Co composite materials, respectively. The room temperature conductivities were measured and the highest conductivity was measured as 2.26E−07 S cm −1 for COF-1,2-(CoCl 2 ). The COF also had fluorescent properties and their emission wavelengths reduced in the presence of Co nanoparticles depending on the n values of the dibromoalkanes.
ISSN:1380-2224
1573-4854
DOI:10.1007/s10934-016-0160-9