918893-26-2Relevant academic research and scientific papers
MECHANICALLY SHAPED 2-DIMENSIONAL COVALENT ORGANIC FRAMEWORKS
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Page/Page column 30-31, (2018/02/28)
Covalent organic frameworks (COFs) usually crystallize as insoluble powders and their processing for suitable devices has been thought to be limited. Here, it is demonstrated that COFs can be mechanically pressed into shaped objects having anisotropic ordering with preferred orientation between the hk0 and 00/ crystallographic planes. Pellets prepared from bulk COF powders impregnated with LiC1O4 displayed room temperature conductivity up to 0.26 mS cm-1 and stability up to 10.0 V (vs. Li+/Li0). This outcome portends use of COFs as solid-state electrolytes in batteries.
Framework: Vs. side-chain amphidynamic behaviour in oligo-(ethylene oxide) functionalised covalent-organic frameworks
Vazquez-Molina, Demetrius A.,Pope, Giovanna M.,Ezazi, Andrew A.,Mendoza-Cortes, Jose L.,Harper, James K.,Uribe-Romo, Fernando J.
supporting information, p. 6947 - 6950 (2018/06/26)
We present a family of covalent organic frameworks that have been functionalized with oligo-(ethylene oxide) chains of varying lengths. Because of the open structure of the COFs, the side chains do not interfere with their crystallization obtaining materials with predictable crystal structure. The difference in length of the side-chains allowed for the determination of amphidynamic behaviour with the use of 13C solid-state NMR relaxation methods. Computational calculations further contribute to understanding the atomistic dynamic behaviour of the different atoms. This study demonstrates the ability to design complex behaviour in organic crystals.
Preparation of phosphorylated bis-pyrazolyl-pyridine nonadendate ligands and their terbium complexes. Part 2
Ziessel, Raymond,Sutter, Alexandra,Starck, Matthieu
scheme or table, p. 3717 - 3721 (2012/09/25)
A series of ligands has been constructed from a central bis-pyrazolyl-pyridine core and various deprotonable chelating pockets based on mixed carboxylate/phosphate or phosphate anionic functions and a central flexible pendent arm for subsequent grafting to biomaterials. For some of these ligands, the sequence of reactions incorporates an additional step introducing a substituted diethynylphenyl residue to increase significantly their solubility in polar organic solvents. The terbium(III) complexes of some of these ligands display outstanding spectroscopic properties with lifetimes ranging from 2.7 to 3.2 ms and quantum yields from 16% to 26% in water.
