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Synthesis and Mixed Valence Aspects of [{(L)ClRu}(2)(mu-tppz)](n+) Incorporating 2, 2 ''-dipyridylamine (L) as Ancillary and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz) as Bridging Ligand
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SYSNO ASEP 0181782 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Synthesis and Mixed Valence Aspects of [{(L)ClRu}(2)(mu-tppz)](n+) Incorporating 2, 2 ''-dipyridylamine (L) as Ancillary and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz) as Bridging Ligand Author(s) Chanda, N. (IN)
Sarkar, B. (DE)
Fiedler, Jan (UFCH-W) RID, ORCID
Kaim, W. (DE)
Lahari, G. K. (IN)Source Title Dalton Transactions. - : Royal Society of Chemistry - ISSN 1477-9226
č. 18 (2003), s. 3550-3555Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords dinuclear ruthenium complexes ; spectroelectrochemical properties ; electron-transfer Subject RIV CG - Electrochemistry R&D Projects GA203/03/0821 GA ČR - Czech Science Foundation (CSF) OC D14.20 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z4040901 - UFCH-W Annotation -The tppz-bridged diruthenium complex [{(L)ClRuII}(2)(mu-tppz)](ClO4)(2), [1](ClO4), {tppz=2,3,5,6-tetrakis(2-pyridyl)-pyrazine, L=2,2''-dipyridylamine} and its mononuclear counterpart [(L)ClRuII(tppz)]ClO4, [2](ClO4) have been synthesized. The 380 mV separation between successive Ru-II/Ru-III couples in [1](2+) leads to a comproportionation constant (K-c) of 2.7x10(6). Consequently, the (RuRuIII)-Ru-II species [1](3+) exhibits a rather narrow intervalence charge transfer band at 1700 run, suggesting a class III mixed-valence state, the electronic coupling constant (V-ab) is calculated at 2940 cm(-1). Complex [1](3+) displays a rhombic EPR spectrum at 4 K (g(1)=3.390, g(2)=2.278, g(3)=1.697), characteristic of ruthenium(III) in a distorted octahedral environment. Both complexes show two successive tppz-based reduction processes [(tppz)(0/-1) and (tppz)(-1/-2)]. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2004
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