Novel Cyclometalated Iridium(III) Xanthate Complexes and Their Phosphorescence Behavior in the Presence of Metal Ions

Abstract

Two cyclometalated iridium(III) complexes, Ir(dpppz)(ppz)(ipx) and Ir(ppz) 2 (ipx) (dpppzH = 1-(2,6-dimethylphenoxy)-4-phenylphthalazine, ppzH = 4-phenylphthalazinone, ipx = isopropyl xanthate), have been synthesized and characterized by single-crystal X-ray diffraction. The photophysical properties of the two complexes were also investigated. Ir(dpppz)(ppz)(ipx) shows orange-red emission at around 606 nm with a phosphorescence quantum yield of ca. 0.0032 and an emission lifetime of 188 ns, while Ir(ppz) 2 (ipx) shows orange-red emission at around 599 nm with a phosphorescence quantum yield of ca. 0.00318 and an emission lifetime of 259 ns. The phosphorescence behavior of Ir(ppz) 2 (ipx) towards different metal cations has also be studied. Its strong phosphorescence is quenched by Hg 2+ , Cu 2+ and Ag + cations. The interaction ratio with Hg 2+ is 1:1.