Synthesis and characterization of a multibridged porphyrin complex containing peripheral bis(bipyridine)-ruthenium(II) groups
- Instituto de Quimica, Sao Paulo (Brazil)
The synthesis and characterization of a new meso-tetrapyridylporphyrin (TPyP) modified with four [Ru(bipy){sub 2}Cl]{sup +} groups is reported. Cyclic voltammograms of this species in N,N{prime}-dimethylformamide exhibit three reversible waves at 0.92, {minus}0.68 and {minus}0.93 V versus SHE, ascribed to the ruthenium(III/II) redox couple, and to successive monoelectronic redox processes at the porphyrin ring. Electronic spectra show the characteristic Soret band at 418 nm and the {beta}, {alpha} doublets of the porphyrin at 518, 558; and 594, 650 nm, respectively, in addition to the absorption bands of the [Ru(bipy){sub 2}(pyP)Cl] groups at 298 nm (bipy {pi} {yields} {pi}), 470 nm (Ru{sup II} {yields} bipy charge-transfer) and 368 nm (ligand field transition). The complex emits around 655 nm, when excited at the porphyrin or Ru(bipy){sub 2}Cl{sup +} absorption bands. The diprotonated species [H{sub 2}TPyP(Ru{sup II}(bipy){sub 2}Cl){sub 4}] displays a new intense band at 690 nm which disappears when the metal ions are oxidized, or when the porphyrin is reduced, suggesting a ruthenium(II)-to-protonated porphyrin charge-transfer transition. 17 refs., 6 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 83251
- Journal Information:
- Journal of Coordination Chemistry, Vol. 30, Issue 1; Other Information: PBD: 1993
- Country of Publication:
- United States
- Language:
- English
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