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Valence structures of the diastereomeric complexes meso- and rac-[Ru-2(acac)(4)(mu-Q)](n) (n=2-, 1-, 0, 1+, 2+) with the multiple quinonoid bridging ligand Q=1,2,4,5-tetraimino-3,6-diketocyclohexane
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SYSNO ASEP 0336246 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Valence structures of the diastereomeric complexes meso- and rac-[Ru-2(acac)(4)(mu-Q)](n) (n=2-, 1-, 0, 1+, 2+) with the multiple quinonoid bridging ligand Q=1,2,4,5-tetraimino-3,6-diketocyclohexane Title Valenční struktury diastereomerických komplexů meso- a rac-[Ru2(acac)4(µ-Q)]n (n = 2-, 1-, 0, 1+, 2+ ) s multi-quinonoidním můstkovým ligandem Q = 1,2,4,5-tetraimino-3,6-diketocyklohexan Author(s) Kumbhakar, D. (IN)
Sarkar, B. (DE)
Das, A. (IN)
Das, A. K. (DE)
Mobin, S. M. (IN)
Fiedler, Jan (UFCH-W) RID, ORCID
Kaim, W. (DE)
Lahiri, G. K. (IN)Source Title Dalton Transactions. - : Royal Society of Chemistry - ISSN 1477-9226
-, č. 43 (2009), s. 9645-9652Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords diastereoisomers ; electrochemistry ; EPR features Subject RIV CG - Electrochemistry R&D Projects OC 139 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) OC 140 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000271162300034 DOI 10.1039/b906900c Annotation Meso- and rac-configurated diastereoisomers [Ru2(acac)4(µ-Q)] have been separated and identified as RuII–Q0 species through a crystal structure analysis of the meso form. Cyclic voltammetric and spectroelectrochemical (UV-vis-NIR, IR, EPR) characterisation of the five accessible states (2-, 1-, 0, 1+ and 2+ forms) was performed. Oxidation occurs at the metal ions to produce RuIIRuIII mixed-valent states with corresponding EPR features but without detectable intervalence absorption in the near infrared region. IR-spectroelectrochemistry reveals opposite frequency shifts for the ν(C=O) and ν(NH) stretching vibrations on reduction and oxidation, in agreement with the assumed electronic structure. Reduction leads to strongly stabilised [Ru2(acac)4(µ-Q)]- states which show weak NIR shoulders around 1040 nm. The EPR characteristics are remarkably different for the two isomeric monoanions, reflecting presumably flexible geometry and electronic structure. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2010
Number of the records: 1