W0011

Less Difficult But Still Not Easy. James A. Ibers, Dept. of Chemistry, Northwestern Univ., Evanston, IL 60208-3113.

Determinations of crystal structures of small molecules and extended structures are far easier than in years gone by, but they may still be fraught with problems and pitfalls. Worse yet, they may provide no information of use to the chemist or they may provide deceptive information. This lecture will present a little history for those under 40 and then concentrate on some recent examples of problems and pitfalls in structure determinations of metal chalcogenide molecular and solid-state systems.