Ruthenium(II) bipyridine complexes with pendant anthracenyl and naphthyl moieties: A strategy for a ROS generator with DNA binding selectivity
摘要:
Coordination compounds that combine selective DNA binding with reactive oxygen species (ROS) generation production have been sought as tools for cell biology studies and cancer therapy. In this respect, the contribution of this work lies on the use of anthracenyl (Ru-Anth) and naphthalyl-pedant (Ru-Naph) ruthenium(II) bipyridine complexes, which were synthesized and fully characterized by spectroscopic and electrochemical techniques. Both complexes presented efficient O-1(2) photogeneration, with anthracenyl-pendant showing higher quantum yields as well as center dot OH production. The DNA photocleavage showed to be dependent on the energy of the exciting radiations thus indicating that the photocleavage process mostly involves the O-1(2) species. In comparison to Ru-Naph, the higher efficiency of the Ru-Anth complex toward the DNA cleavage was assigned to the presence of the anthracenyl moiety that provides an efficient channel to generate O-1(2). These findings have validated the use of conjugated organic ligands with metal complexes as a strategy to bring together binding and photooxidative properties. (C) 2015 Elsevier B.V. All rights reserved.