Synthesis, Characterization and electrochemical Studies of a series of polypyridile Ruthenium complexes

In this study, we report the synthesis and characterization of two new polypyridile Ruthenium Complexes, [Ru(Tttp)(opda-H2)Cl]PF6 and [Ru(Tttp)(en)(H2O)](PF6)2.3/2CH3CN. Complexes were characherized by 1HNMR, 13CNMR, IR and UV-Vis spectroscopies, Mass spectroscopy and elemental analysis. 1HNMR studies show that in [Ru(Tttp)(opda-H2)Cl]PF6, orthophenylenediamine is coordinated as (bqdi) or (s-bqdi) by loosing two hydrogen atoms, one from each amino groups. Electrochemiccal studies also show a redox potential at 1.55 V Vs. NHE which is duo to either RuII(bqdi)/RuIII(bqdi) or RuIII(s-bqdi)/RuIV(sbqdi) Reactions. Besides, another peak at -0.924 V is observed which due to either RuII(bqdi)/RuII(s-bqdi) or RuIII(s-bqdi)/RuII(s-bqdi). In the case of [Ru(Tttp)(en)(H2O)](PF6)2.3/2CH3CN, despite the usual coordination of chloro atom, a water molecule is coordinated. Electrochemical studies also reveal a redox peak at 1.66 Vs. NHE which is due to RuII/RuIV(O) redox reaction.