A set of rhenium(V)-oxo <i>meso</i>-triarylcorroles bearing ester and carboxylic acid functionalities were synthesized with a view to determining their potential for photodynamic therapy. Toward this end, we measured their near-IR phosphorescence and their ability to sensitize singlet oxygen formation. The two esters studied, Re^VO 5,10,15-tris(<i>meta</i>-carbomethoxyphenyl)corrole and ...