In several readings, I noticed that the samples were frozen in liquid nitrogen before heating them in autoclaves, especially if the solvent is DMF, NMP etc.
As I am novice in this direction, can anyone explain me what is the purpose of freezing?
Mr. Nagapradeep N.,
WHich type of MOFs you have reflected in mind, because of we obtain MOF at relatively mild conditions?
For example,
https://pubs.rsc.org/en/content/articlehtml/2013/sc/c3sc22207a Article Ligand Bridging-Angle-Driven Assembly of Molecular Architect...
If it is not a problem to share, Would you please share what kind of mild conditions did you employed in your case?
Entropy is an important role for any kind of reactions. For the synthesis of MOFs, liquid nitrogen can freeze the starting materials and reaction will go slow down and more probability to get a single crystal.
May be to ensure slow formation of the reaction intermediate
and to avoid rapid precipitation
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