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Phosphorescent iridium(III) complexes with three bidentate carborane-functionalized ligands have been synthesized. The luminescent efficiency of the o-carborane-based facial complex fac-o shows solvent-molecule dependence both in solution and solid state that is related to the dielectric constant. The water-soluble and high phosphorescence-efficient nido complex nido-fac-o can be used in fluorescence lifetime bioimaging.
Shi et al. (Wed,) studied this question.