The selective paramagnetic relaxation of oligonucleotide proton resonances of d(GTCGAC) 2 and d(GTGCAC) 2 by Ni(phen) 2 (L) 2+ where L= dipyridophenazine (dppz), dipyrido[3,2-d:2',3'-f]quinoxaline (dpq) and phenanthrenequinone (phi) has been examined to obtain structural insight into the non-covalent binding of these metal complexes to DNA. In the oligonucleotide d(GTCGAC) 2 , preferential broadening of the G1H8, G4H8, T2H6, and C3H6 proton resonances was observed with Ni(phen) 2 (dppz) 2+ , Ni(phen) 2 (dpq) 2+ and Ni (phen) 2 (phi)
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