Affiliation:
1. INQUINOA (CONICET-UNT) Instituto de Química Inorgánica Facultad de Bioquímica Química y Farmacia Universidad Nacional de Tucumán Ayacucho 471 T4000INI San Miguel de Tucumán Argentina
2. INFINOA (CONICET-UNT) NanoProject Departamento de Física Facultad de Ciencias Exactas y Tecnología Universidad Nacional de Tucumán (UNT) and Instituto de Física del Noroeste Argentino Av. Independencia 1800 San Miguel de Tucumán 4000 Argentina
3. INQUIMAE (UBA – CONICET, DQIAyQF) Universidad de Buenos Aires Ciudad Universitaria Pabellón 2, 3°piso C1428EHA Buenos Aires Argentina
Abstract
AbstractIn this work, we report the synthesis and physicochemical characterization of new chloro and aqua mononuclear Ru (II) complexes of formula [Ru(LLL)(dpp)Cl]PF6and [Ru(LLL)(dpp)OH2](PF6)2(LLL=tpy =2,2’ : 6’,2’’‐terpyridine; tptz=2,4,6‐tris(2‐pyridyl)‐1,3,5‐triazine and dpp=2,3‐bis(2‐pyridil)pyrazine). For the complex [Ru(tptz)(dpp)Cl]PF6, the complete structure was determined by X‐ray diffraction. Catalytic studies of aqua‐complexes revealed that they are active for the water oxidation reaction at pH 1 using cerium ammonium nitrate (CAN) as a sacrificial oxidant. Also, we were able to establish the reaction mechanism and rate constants of each stage of the catalytic cycle, turnover frequencies (TOFs), and turnover numberes (TONs). The experimental TON values for the aqua complexes were very close to the theoretical value of 7.5, indicating a high degree of recovery. DFT and TD‐DFT calculations of electronic states for all complexes were consistent with experimental results and allowed the complete assignment of their UV‐Visible bands and redox states.
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2 articles.
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