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The salts [(η-C5Me5)Ru(NO)(bipy)][OTf]2 (1[OTf]2) and [(η-C5Me5)Ru(NO)(dppz)][OTf]2 (2[OTf]2) are obtained from the treatment of (η-C5Me5)Ru(NO)(OTf)2 with 2,2‘-bipyridine (bipy) or dipyrido[3,2-a:2‘,3‘-c]phenazine (dppz) (OTf = OSO2CF3). X-ray data for 1[OTf]2: monoclinic space group P21/c, a = 11.553 (4) A, b = 16.517 (5) A, c = 14.719 (4) A, β = 94.01 (2)°, V = 2802 (2) A3, Z = 4, R1 = 0.0698. X-ray data for 2[OTf]2: monoclinic space group P21/c, a = 8.911 (2) A, b = 30.516 (5) A, c = 24.622 (4) A, β = 99.02 (1)°, V = 6613 (2) A3, Z = 8, R1 = 0.0789. Both 1[OTf]2 and 2[OTf]2 are soluble in water where they exhibit irreversible electrochemical oxidation and reduction. A fluorescence-monitored titration of a DNA solution containing 2[OTf]2 with ethidium bromide provides evidence that 22+ intercalates into DNA with a binding constant greater than 106 M-1. DNA cleavage occurs when the DNA solutions containing 2[OTf]2 are photolyzed or treated with H2O2 or K2S2O8.

The salts [(eta-C(5)Me(5))Ru(NO)(bipy)][OTf](2) (1[OTf](2)) and [(eta-C(5)Me(5))Ru(NO)(dppz)][OTf](2) (2[OTf](2)) are obtained from the treatment of (eta-C(5)Me(5))Ru(NO)(OTf)(2) with 2,2'-bipyridine (bipy) or dipyrido[3,2-a:2',3'-c]phenazine (dppz) (OTf = OSO(2)CF(3)). X-ray data for 1[OTf](2): monoclinic space group P2(1)/c, a = 11.553 (4) Å, b = 16.517 (5) Å, c = 14.719 (4) Å, beta = 94.01 (2) degrees, V = 2802 (2) Å(3), Z = 4, R1 = 0.0698. X-ray data for 2[OTf](2): monoclinic space group P2(1)/c, a = 8.911 (2) Å, b = 30.516 (5) Å, c = 24.622 (4) Å, beta = 99.02 (1) degrees, V = 6613 (2) Å(3), Z = 8, R1 = 0.0789. Both 1[OTf](2) and 2[OTf](2) are soluble in water where they exhibit irreversible electrochemical oxidation and reduction. A fluorescence-monitored titration of a DNA solution containing 2[OTf](2) with ethidium bromide provides evidence that 2(2+) intercalates into DNA with a binding constant greater than 10(6) M(-)(1). DNA cleavage occurs when the DNA solutions containing 2[OTf](2) are photolyzed or treated with H(2)O(2) or K(2)S(2)O(8).