Color difference caused by chirality

Synthesis, crystal structure and spectra properties of enantiopure and corresponding racemic Cu(II)-dipyridine amido complexes are reported. The different coordination styles result in the unexpected chiral-unrelated color changes between chiral and racemic complexes.

Molecular packing in the crystal of the racemic-1. (R,R) and (S,S) molecules pack alternately with intermolecular Cu–O bond length of 2.451 Å.Figure optionsDownload as PowerPoint slideResearch Highlights
► Chiral-unrelated optical properties could be affected by molecular chirality.
► A racemic and corresponding Enantiopure complex showed different color in crystal.
► The color difference came from the different coordination style of Cu.