Crystal with two different melting points

Tom.G

Science Advisor
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Summary
Back in 1896, acetaldehyde phenylhydrazone (APH) kept melting at two very different temperatures. A batch he produced on Monday might melt at 65 °C, while a batch on Thursday would melt at 100 °C. Here's why.

DrClaude

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I'm not impressed. When I was a student, my entire class could synthesize the same molecule that would melt at different temperatures :wink:

Joking aside, this is a fascinating discovery. My favorite quote from the article:
Occasional forays to temperatures higher than the delicate equipment’s 100 °C limit led to “frowning technicians,” Meekes says, but the risk was worth it.
 

Dr. Courtney

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Great article. Thanks for the link.

Highly recommended account of how data and sleuthing are supposed to work in science.
 

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