Why two similar materials crystallise at different times?

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The discussion centers on the crystallization rates of two ionic crystals containing the same cation but differing anions: CH3 and Cl. Despite having similar unit cells and space groups, the CH3 crystal crystallizes in 2 hours while the Cl crystal takes between 1 and 2 days. This discrepancy is attributed to the thermodynamics of crystallization, specifically the differences in degrees of freedom associated with the anions, which influence the crystallization kinetics.

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01Jose01
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I have two ionic crystals (metal complexes). Both of them contain the same cation but the anion are different in one functional group. One is a CH3 and the other is a Cl. Both of the crystals have similar unit cell and space group. However, to obtain the same quality, one crystalise in 2 hrs and the other between 1 and 2 days. why?

Think that it has to be with the thermodynamics of crystalllisation but I'm not sure how.

What do you think?
 
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01Jose01 said:
thermodynamics of crystalllisation but I'm not sure how.

01Jose01 said:
CH3 and the other is a Cl
Compare the number of degrees of freedom.
 

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