Structure, electrochemistry and spectroscopy of a new diacylhydrazido-bridged diruthenium complex with a strongly near-infrared absorbing RuIIIRuII intermediate

0346411 - ÚFCH JH 2011 RIV NL eng J - Journal Article
Jana, R. - Sarkar, B. - Bubrin, D. - Fiedler, Jan - Kaim, W.
Structure, electrochemistry and spectroscopy of a new diacylhydrazido-bridged diruthenium complex with a strongly near-infrared absorbing RuIIIRuII intermediate.
Inorganic Chemistry Communications. Roč. 13, č. 10 (2010), s. 1160-1162. ISSN 1387-7003. E-ISSN 1879-0259
R&D Projects: GA MŠMT OC 140; GA MŠMT OC09043
Institutional research plan: CEZ:AV0Z40400503
Keywords : crystal structure * hydrazido ligand * near-infrared ruthenium
Subject RIV: CG - Electrochemistry
Impact factor: 1.974, year: 2010

Reaction of Ru(bpy)2Cl2·2 H2O with 1,2-bis(trifluoroacetyl)hydrazine H2(adc-CF3) under basic conditions yields the dinuclear [(μ-adc-CF3){Ru(bpy)2}2]2+ ion which was isolated and crystallized for structure determination in the meso diastereoisomer form as the bis(hexafluorophosphate). The Ru ··Ru distance was determined at 5.029(1) Å, and the N–N bond length at 1.463(5) Å reveals a hydrazido(2−) form of the bridge, implying unchanged + II metal oxidation states. Besides bpy-based reduction, the cyclic voltammetric analysis revealed two oxidation waves with a (3+) intermediate. Spectroelectrochemistry demonstrated that this intermediate [(μ-adc-CF3){Ru(bpy)2}2]3+ with a comproportionation constant of Kc = 108.8 and an absorption at 1680 nm (ε = 9900 M-1 cm−1) is a mixed-valent species as evident most convincingly from the EPR parameters at g1 = 2.239, g2 = 2.065, g3 = 1.891 (gav = 2.101, Δg = g1 − g3 = 0.348).
Permanent Link: http://hdl.handle.net/11104/0187448