Abstract
The new ligand Ql-tpy (8-(2,6-di(pyridin-2-yl)pyridin-4-yl)quinoline) and the corresponding aqua complex [Ru(Ql-tpy)(bpy)(OH2)](PF6)2 (1) have been synthesized and characterized by the different spectroscopic methods. This complex shows two pKa values, pKa1 due to the deprotonation from the protonated N atom located on the quinoline moiety at 3.0 and another pKa2 at 10.5 due to the deprotonation from aqua ligand. The catalytic activity of the complex 1 towards water oxidation was studied in CF3SO3H solution (pH ≈ 1) using CeIV as an oxidant. The free N atom of the substituted quinoline moiety of the complex gets protonated at pH ≈ 1 and acts as an electron withdrawing group instead of electron donating group. Due to the electron withdrawing effect it shows a lower catalytic activity towards chemical water oxidation having turnover number (TON) of 18 (out of 25) and initial turnover frequency (TOF) 0.003 s−1 as compared to the previously reported [RuII(QCl-tpy)(bpy)(H2O)]2+ complex.
Published Version
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