Melting Point

[Dave12314]

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Does anyone know why fluorene has a higher MP than benzhydrol? I would have expected benzhydrol to have a higher MP because it is able to hydrogen bond.

 

[Pisiform]

Does anyone know why fluorene has a higher MP than benzhydrol? I would have expected benzhydrol to have a higher MP because it is able to hydrogen bond.

F2 Melting Point: - 219.62 °C

Benzhydrol MP 69 degree C

i think u missed the negative sign

 

[Ssina]

F2 is fluorine though
Fluorene- MP 116oC

vs.
benzhydrol- MP 69oC

If I was gonna guess, would be due to packing, since melting has to do with interactions while compounds pack together when solids... so e.g. Fluorene being hydrophobic packing better vs. benzhydrol with OH group.... H-Bonding is mostly with BP and the BP for benzhydrol is much higher, as expected! (EDIT: nevermind, they have pretty much the same BP at 290ish)

 

[Dave12314]

You have the wrong molecule. MP for fluorene is 116-117 °C.. very interesting...

 

[Pisiform]

ohh lol sorry my bad

 

[JD7]

Maybe it has to do with crystallization?

 

[MedPR]

Like the others, I would guess it's due to crystallization. The OH group is somewhat insignificant since the hydrophobic portion is so large. The first thing that came to mind for me was how insignificant the OH group on cholesterol was in terms of water solubility.

 

[Dave12314]

Like the others, I would guess it's due to crystallization. The OH group is somewhat insignificant since the hydrophobic portion is so large. The first thing that came to mind for me was how insignificant the OH group on cholesterol was in terms of water solubility.

What about the crystallization. Are you referring to the packing structure that Ssina mentioned?

 

[MedPR]

What about the crystallization. Are you referring to the packing structure that Ssina mentioned?

Yea. If they can pack better/tighter, that means there are more intermolecular forces.