Greetings
I've been searching for quite a while about Covalent organic framework (COF) and Porous organic polymer (POP) XRD pattern, how their xrd pattern should be and their differences.
But i could not find any specific findings.
some texts mentioned that COF xrd pattern should be sharp and pop should be broad. But ive seen so many COFs with broad PXRD pattern.
How can you distinguish between these two? How could you know that your product is POP or COF (etc. )?
Can somebody share their knowledge or mention a helpful Paper? Im so confused.
Thanks a lot.
Hello, Pejman Rahmani Nejad
I don't have experience wit COF or POP, but I will talk about XRD.
For each crystal structure, there is a correspondent pattern. Have you ever heard about the CIF files? They are files which contain all the information about the crystal structure of a material. It is easily found in databases like Crystallography Open Database or Cambridge Crystallographic Data Centre, but I cannot affirm that the structure you are looking for is there, we would have to search.
The point is, when you have a CIF file, you can use a software like VESTA or Mercury, and calculate a XRD pattern of that strucuture. So, the easiest way to tell what is the difference between COF and POP patterns is to calculate them and check by yourself.
About being sharp or being broad: According to Scherrer's Equation, the broadening of the peaks is inversely proportional to crystallite size, which means that very broad peaks probably indicate a nanometric crystallite.
"How can you distinguish between these two? How could you know that your product is POP or COF (etc. )?" About this question... from XRD you distinguish the crystal structure, but XRD is not an elemental analysis, so if you need to determine the elements present in your compound, you must do some other analysis. But from XRD you can say "This pattern is correspondent to structure xxxxx, and the other pattern is correspondent to yyyyy structure, so xxxx could be a COF and yyyy could be a POP", something like this.
It's just a little explanation bout this topic, feel free to reply.
Best regards
Ricardo Tadeu
Refer all these articles Pejman Rahmani Nejad
1. Article Structure determination of a low-crystallinity covalent orga...
2. Article Eyes of covalent organic frameworks: Cooperation between ana...
3. 10.3390/polym15020267
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