Europium complexes have been studied for their versatile photophysical properties, which make them interesting for applications in cellular imaging, immunoassays, and organic light-emitting diodes. In our previous analysis of the CO-ADD data, one europium complex was highlighted for its antibacterial activity. There have been a few sparse reports on the potential antimicrobial properties of lanthanide-complexes, including europium. Upon closer inspection of the structures of these compounds we found a series of similar europium complexes (Eu-S1-S8, Figure in the SI) in our data set.