Appraisal of the redox behaviour of the antimetastatic ruthenium(III) complex [ImH][RuCl(4)(DMSO)(Im)], NAMI-A.
The imidazolium trans-tetrachloro(dimethylsulfoxide)imidazoleruthenate(III) complex [ImH][Ru(III)Cl(4)(DMSO)(Im)], NAMI-A, has shown an interesting antimetastatic activity. Since Ru(III) complexes are coordinatively more inert than the corresponding Ru(II) derivatives, an "activation by reduction" mechanism has been proposed to explain the biological activity of NAMI-A, thus acting as a pro-drug. We report here an electrochemical study on NAMI-A in aqueous solutions which emphasizes the structural and chemical consequences accompanying the easy Ru(III)/Ru(II) electron transfer (e.g., axial imidazole/water exchange in acidic solution in the short timescale of cyclic voltammetry followed by equatorial chloride/water exchange in the longer timescale of macroelectrolysis).
Dipartimento di Scienze dell'Ambiente e della Vita, Universita del Piemonte Orientale "Amedeo Avogadro", Spalto Marengo 33, 15100 Alessandria, Italy.
Mauro
M
Ravera
Sara
S
Baracco
Claudio
C
Cassino
Piero
P
Zanello
Domenico
D
Osella
D000970:Antineoplastic Agents / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000031:analogs & derivatives* / Q000737:chemistry*; D004566:Electrodes; D004572:Electrolysis; D009682:Magnetic Resonance Spectroscopy; D009362:Neoplasm Metastasis; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D012428:Ruthenium / Q000737:chemistry*; D017975:Ruthenium Compounds; D021241:Spectrometry, Mass, Electrospray Ionization; D013997:Time Factors
D000970:Antineoplastic Agents; D009942:Organometallic Compounds; D017975:Ruthenium Compounds; C113661:imidazolium-bis(imidazole)dimethylsulfoxideimidazotetrachlororuthenate(III); D012428:Ruthenium; D004121:Dimethyl Sulfoxide