The novel luminescent gold (I) complex [N-(N′, N′-dimethylaminoethyl)-1, 8- naphthalimide-4-sulfide](triethylphosphine) gold (I) was prepared and investigated for its primary biological properties. Cell culture experiments revealed strong antiproliferative effects and induction of apoptosis via mitochondrial pathways. Biodistribution studies by fluorescence microscopy and atomic absorption spectroscopy showed the uptake into cell ...