Nicola Armaroli, Francesco Barigelletti, Giuseppe Calogero, Lucia Flamigni, Nicola Armaroli, Claire M. White and Michael D. Ward
Complexes Ru–C and Os–G are derivatives of [Ru(bipy)3]2+ and [Os(bipy)3]2+ bearing peripheral cytosine (C) or guanine (G) nucleobases respectively; in CH2Cl2 these undergo association (KA > 5000 dm–3 mol–1) by hydrogen bonding between the complementary C/G groups, and Ru → Os photoinduced energy-transfer occurs within Ru–C···G–Os associated pair.