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 Hg2+, Cu2+ and Ag + cations. The interaction ratio with Hg2+ is 1:1. © 2012 Verlag der Zeitschrift fur Naturforschung.