부산대학교 도서관

Reaction of tetrakis(2-phenylpyridinato-C2,N′)(μ-dichloro)di-iridium with 3-(pyridin-2-yl)-4H-benzo[e][1,2,4]thiadiazine (L1) under neutral and basic media afforded the charged and neutral Ir-complexes,1and2, respectively, in good yields (63–79%). Single-crystal XRD analysis confirms that the ancillary ligands in both1and2bind to the iridium via coordination of N2of the benzo[e][1,2,4]thiadiazine. Upon isolation of the neutral complex, the sulfur rapidly oxidizes to form2. The UV–vis absorption spectra of the complexes exhibit both ligand-centered and mixed metal-to-ligand and ligand-to-ligand charge transfer transitions that are typical of many heteroleptic iridium complexes. Complexes1and2were emissive at room temperature in the green and yellow region of the electromagnetic spectrum, respectively, albeit with poor photoluminescence quantum yield (ΦPL = 1.1–2.5%). [ABSTRACT FROM AUTHOR]