I am doing a synthesis on long alkoxy chain acetophenone derivative and obtained a yellowish product that was liquid at first (around 2 hours before I left it overnight in a dark environment under room temperature) but somehow solidified overnight under room temperature. What is the reason for this occurrence?
It is quite normal. Many compounds specially low melting solids take some time to solidify. Preserving the sample at low temperature can speed up crystalization. Presence of trace of moisture or impurities can also delay in the formation of solids from viscous liquids. Once you get a solid sample preserve it and in next time while preparing the same compound add few grains of this solids of first lot to the viscous liquid of second lot and scratch the sample with a glass rod or spatula. It may help solidification rapidly.
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