Are there other isomorphous chiral crystals that have the same absolute configuration but rotate polarized light in opposite directions?

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Andreas Leineweber

I am not an expert in this, but just got the idea. If you are looking for such an effect, you might look for matials where the specific rotation changes sign with changing wavelength somewhere. If you then have an isomorphous compound, it is not unlikely that this you have the 0-point at another wavelength or not at all, and then you automatically have this effect.

Demetrius Levendis

Andreas Leineweber Thank you! You have out me on the right track.