Ruthenium- and osmium-arene complexes of 8-substituted indolo[3,2-c]quinolines: Synthesis, X-ray diffraction structures, spectroscopic properties, and antiproliferative activity

► Synthesis of novel indolo[3,2-c]quinoline-based ruthenium- and osmium-arene complexes. ► Characterisation by 1D/2D NMR-, UV-Vis spectroscopy, ESI mass spectrometry and X-ray crystallography. ► In vitro antiproliferative activity determined by MTT assay.