[foxthreefour]

When crystallising a compound I have made sure that the solution is effectively saturated at 80°C and slowly cooled at a rate of 5°C per hour until it gets to room temperature. The problem is I'm returning to find a clear solution, then upon moving the container crystallisation starts and within 10 minutes it is a solid mass. I'm looking to grow quality crystals, could it really be as simple as lack of nucleation sites during cooling?

[rolnor]

Give it more time?

[foxthreefour]

Give it more time?

Sorry, I probably should have stated the time I leave it. Its left for a period of 14 hours, so is at room temperature when it is checked. Previously crystallisation has started around 50°C and below.

[rolnor]

If you wait over a weekend you could have really nice crystals.

[hypervalent_iodine]

14 hours isn't really that long. I would wait over the weekend without disturbing it, as rolnor suggested.

[kriggy]

It depends on multiple variables such as stirring or presence of nucleation sites in your glassware stuff like dust particles in your glassware could start crystalization at 50°C, while if you used clean glasware, you dont get any crystalization etc..