I have to identify an unknown in my organic chemistry lab. I...

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Question by Dawn
Submitted on 1/29/2004
Related FAQ: Sci.chem FAQ - Part 1 of 7
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I have to identify an unknown in my organic chemistry lab. I found an IR spectrum of my unknown, and it was an exact match to the compound dibenzofuran. However, when I looked up the msds on the compound, the physcial appearance description listed it as a "white" solid. The compound I got was a medium beige color, and it had clumps of solid. It also had a characteristic odor. Any help would be greatly appreciated!!!

Answer by diek
Submitted on 2/12/2004
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pure dibenzofuran may be white & crystalline. impurities in the form of conjugated unsaturated C-bonds ...C=C-C=C... are frequently yellow/orange. also impurities in a product will modify it's crystallisation behaviour, and might inhibit crystaline forms, form lumps etc. So maybe your product was contaminated or partly decomposed? the contamination may not show up in the IR if it is only in small amounts. happy hunting...

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