Thermodynamic Modeling and Solubility Parameter of 2,6-Pyridinedicarboxylic Acid in Selected Solvents at Different Temperatures

2021 ◽  
Author(s):  
Xianzhao Shao ◽  
Yujia Zhang ◽  
Wei Wang ◽  
Junhai Liu ◽  
Zhizhou Li ◽  
...  
Keyword(s):  
Thermodynamic Modeling ◽  
Solubility Parameter ◽  
Pyridinedicarboxylic Acid ◽  
Different Temperatures

Solubility evaluation and thermodynamic modeling of β-lapachone in water and ten organic solvents at different temperatures

2018 ◽  
Vol 472 ◽  
pp. 1-8 ◽  
Author(s):  
Ki Hyun Kim ◽  
Hee Kyung Oh ◽  
Bora Heo ◽  
Nam Ah Kim ◽  
Dae Gon Lim ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Thermodynamic Modeling ◽  
Different Temperatures

scholarly journals Post-synthetic ligand exchange in zirconium-based metal-organic frameworks: beware of the defects!

2017 ◽  
Author(s):  
Marco Taddei ◽  
Russell J. Wakeham ◽  
Athanasios Koutsianos ◽  
Enrico Andreoli ◽  
Andrew R. Barron
Keyword(s):  
Ligand Exchange ◽  
Metal Organic Framework ◽  
Exchange Process ◽  
Metal Organic Frameworks ◽  
Chemical Properties ◽  
Ex Situ ◽  
Pyridinedicarboxylic Acid ◽  
Different Temperatures ◽  
Synthetic Ligand ◽  
Metal Organic

<p>Post-synthetic ligand exchange is a valuable synthetic tool for functionalisation of zirconium-based metal-organic frameworks. It is generally assumed that the exchange involves organic linkers, however these materials are known to contain large amounts of defects, which are likely to play a role during the exchange process. This can eventually lead to unexpected effects on the physical-chemical properties of the material. Post-synthetic ligand exchange in the prototypical zirconium-based metal-organic framework UiO-66 was investigated by <i>in situ</i> solution nuclear magnetic resonance. Samples of UiO-66 prepared either with or without modulators (formic acid or benzoic acid) and having different degrees of defectivity were exchanged using solutions of 2,5-pyridinedicarboxylic acid at different temperatures. Linker exchange only occurred in a defect-free UiO-66, whereas monocarboxylates grafted at defective sites were found to be preferentially exchanged with respect to terephthalic acid over the whole range of conditions investigated. A 1:1 exchange ratio between 2,5-pyridinedicarboxylic acid and modulator was observed, providing evidence that the defects had missing-cluster nature. These findings were corroborated by <i>ex situ</i> characterisation of exchanged samples.</p>

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