Résumé : The synthesis and characterisation of a new bifunctional Ru(II) complex are presented. This compound contains a metallic unit, photo-reactive versus the guanines of DNA, and a new bifunctional ligand. An intramolecular luminescence quenching makes this complex an attractive candidate for photoprobing DNA where the intramolecular quenching process is inhibited with restoration of luminescence. © 1998 Elsevier Science S.A. All rights reserved.