Room-temperature phosphorescence and static excimer excitation of pyrene-modified (NCN) pincer bismuth complexes

Abstract

We present the synthesis, characterization, and photophysical properties of two pyrene-modified (NCN) pincer bismuth complexes, where the pyrenyl residues are either part of the cyclometalating pincer ligand (1) or bound as monodentate ligands to the BiIII ion (2). Both complexes are dually emissive at 77 K. For complex 2, pyrenyl phosphorescence persists at r.t. in degassed CH2Cl2, albeit with reduced intensity. This renders 2 one of only a handful of Bi complexes showing this property.