Extended Data Fig. 1: Eu3+ complex preparation and X-ray crystal structure.
From: Ultra-narrow optical linewidths in rare-earth molecular crystals
Upper: Schematic representation of the preparation of the europium complex discussed in this study. Lower: X-ray crystal structure of the complex. As shown, the piperidin-1-ium cation is involved in hydrogen bonding interactions with two oxygen atoms of benzoylacetonate ligands.
