MadSci Network: Chemistry

Re: How does presence of impurities/ slight impurities interfere in crystal ?

Date: Tue Nov 2 21:23:22 1999
Posted By: Uncle Al Schwartz, Organic synthetic chemist
Area of science: Chemistry
ID: 941542482.Ch

Get thee to a university chemistry library! This stuff is not trivial.  
Within the last six months or so the Journal of the American Chemical 
Society has featured a lovely article on "poppy acid" and its dyeing.  The 
Journal of Chemical Education has had at least one cover story on dyeing 
crystals over the years, possibly more.  Find the articles, look at the 
references.  You can go to Science Citation Index to search the articles 
forward in time - by who references them.

It is not just a question of fitting the dye molecules into the crystal 
structure.  They go in with consistent orientation, leading to dichroic 
effects (pretty!).  It was a big deal in the 19th century when synthetic 
dyes became popular, and it is still a subject of great fun and 
fascination.  But it isn't trivial in execution or understanding.

Uncle Al!

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