The invention relates to novel compounds that are useful for modulating mitochondrial morphology and/or expression of OXPHOS enzymes and/or cellular ROS. The compounds are derivatives of TroloxrM wherein the carboxylic acid moiety is replaced by an amide moiety and wherein the nitrogen atom of the amide moiety is connected via a linker to a cationic nitrogen atom. The compounds of the invention are formulated into pharmaceutical or cosmetic compositions. The invention further relates to methods wherein the compounds of the invention are used for treating or preventing mitochondrial disorders, conditions associated with mitochondrial dysfunction, including adverse drug effects, and/or neoplastic diseases. The invention also relates to cosmetic methods for treating or delaying further aging of the skin and veterinary applications.