crest-lab / crest

CREST - A program for the automated exploration of low-energy molecular chemical space.
https://crest-lab.github.io/crest-docs/
GNU Lesser General Public License v3.0
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How to avoid chiral axis flipping #165

Closed npe1011 closed 5 months ago

npe1011 commented 1 year ago

Hello,

When I run conformation search of a molecule involving a chiral axis, e.g. binaphthyl compounds, the result often involves structures in which the chiral axis (R/S) is flipped. Is there any good way to avoid such flipping?

I currently omit flipped structures manually or by a script, but in the worst case, only flipped structures are found in the result file.

Thank you very much.

pprcht commented 1 year ago

Hi,

As there is currently no way to automatically detect the chirality of an atom, I fear that there is no automatic way to prevent that. However, I assume if you have only a few chirality centers in your structure, you can introduce a dihedral angle constraint on the chiral atom and three of its neighbors to prevent the inversion.

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