Assembly of Near‐Infrared Luminescent Lanthanide Host(Host–Guest) Complexes With a Metallacrown Sandwich Motif

Abstract

Oscillators omitted: A self-assembled inclusion complex between a LnIII[12-metallacrown-4]23+ sandwich motif (green and bronze) and a [24-metallacrown-8] (purple) is stable in methanol. The YbIII complex has a large quantum yield (0.89 %) and luminescent lifetime (14 μs) in methanol, which are attributed to the exclusion of high-energy oscillators from within 6.7 Å of the emitting YbIII ion by the metallacrown topology.