Bis(quinolin-8-olato) Complexes of Ruthenium. Synthesis, Characterization and Cyclic Voltammetric Studies†

Abstract

Reaction of quinolin-8-ol (HQ) with [Ru(bpy)Cl₃] (bpy=2,2′-bipyridine) in the presence of NEt₃ affords [Ru^II(bpy)(Q)₂] which shows a Ru^II–Ru^III oxidation at -0.16 V vs. SCE and a Ru^III–Ru^IV oxidation at 1.06 V vs. SCE; its oxidation by Ce⁴⁺ gives [Ru^III(bpy)(Q)₂]⁺ which has been isolated and characterized as the perchlorate salt.

References

1. (a) K. R. Seddon, Coord. Chem. Rev., 1981, 35, 41; 1982, 41, 79; 1985, 67, 171; (b) K. Kalyansundaram, Coord. Chem. Rev., 1982, 46, 159; (c) E. A. Seddon and K. R. Seddon, The Chemistry of Ruthenium, Elsevier, Amsterdam, 1984; (d) B. K. Ghosh and A. Chakravorty, Coord. Chem. Rev., 1989, 25, 239; (e) W. T. Wong, Coord. Chem. Rev., 1994, 131, 45.
2. (a) J. Chakravarty and S. Bhattacharya, Polyhedron, 1996, 15, 257 and references cited therein; (b) N. Ghatak and S. Bhattacharya, Trans. Met. Chem., 1996, 21, 158; (c) J. Chakravarty and S. Bhattacharya, Polyhedron, 1996, 15, 1047; (d) P. K. Sinha, J. Chakravarty and S. Bhattacharya, Polyhedron, 1996, 15, 2931; (e) P. K. Sinha, J. Chakravarty and S. Bhattacharya, Polyhedron, 1997, 16, 81; (f) N. Ghatak and S. Bhattacharya, Trans. Met. Chem., in press.
3. (a) G. K. Lahiri, S. Bhattacharya, B. K. Ghosh and A. Chakravorty, Inorg. Chem., 1987, 26, 4324; (b) S. Bhattacharya, Polyhedron, 1993, 12, 235; (c) M. Menon, A. Pramanik, N. Bag and A. Chakravorty, J. Chem. Soc., Dalton Trans., 1995, 1417 and references cited therein.
4. (a) N. Ghatak, J. Chakravarty and S. Bhattacharya, Polyhedron, 1995, 14, 3591; (b) N. C. Pramanik and S. Bhattacharya, Polyhedron, 1997, 16 in press.
5. N. E. Tokel-Takvarian, R. E. Hemingway and A. J. Bard, J. Am. Chem. Soc., 1973, 95, 6582.
6. S. Bhattacharya and A. Chakravorty, Proc. Indian Acad. Sci. (Chem. Sci.), 1985, 95, 159.
7. S. Anderson and K. R. Seddon, J. Chem. Res. (S), 1979, 74.
8. (a) D. T. Sawyer and J. L. Roberts Jr, Experimental Electrochemistry for Chemists, Wiley, New York, 1974, pp. 167–215; (b) M. Walter and L. Ramaley, Anal. Chem., 1973, 45, 165.