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2,3-Bis(1-methylimidazol-2-yl)quinoxaline (bmiq), a new ligand with decoupled electron transfer and metal coordination sites: the very different redox behaviour of isoelectronic complexes with [PtCl2] and [AuCl2](+)
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SYSNO ASEP 0358741 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 2,3-Bis(1-methylimidazol-2-yl)quinoxaline (bmiq), a new ligand with decoupled electron transfer and metal coordination sites: the very different redox behaviour of isoelectronic complexes with [PtCl2] and [AuCl2](+) Author(s) Bulak, E. (DE)
Varnali, T. (TR)
Schwederski, B. (DE)
Sarkar, B. (DE)
Hartenbach, I. (DE)
Fiedler, Jan (UFCH-W) RID, ORCID
Kaim, W. (DE)Source Title Dalton Transactions. - : Royal Society of Chemistry - ISSN 1477-9226
Roč. 40, č. 12 (2011), s. 2757-2763Number of pages 7 s. Language eng - English Country GB - United Kingdom Keywords plainum(II) diimine complexes ; polypyridyl ligands ; dinuclear complexes Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects LD11086 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LD11082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000288324600012 DOI 10.1039/c0dt01282c Annotation The new, potentially ambidentate heterocyclic ligand 2,3-bis(1-methylimidazol-2-yl)quinoxaline (bmiq) was obtained from 2,3-bis(1-methylimidazol-2-yl)glyoxal and 1,2-diaminobenzene. Its coordination to PtCl2 and to the isoelectronic [AuCl2](+) in [AuCl2(bmiq)](AuCl4) occurs via the imine N donors of the imidazolyl groups, leading to the formation of seven-membered chelate rings with boat conformation. According to the spectroelectrochemistry (UV-vis-NIR, EPR), the reversible electron addition to the [PtCl2(bmiq)] and the free ligand takes place in the (non-coordinated) quinoxaline part of the molecule, similarly as for related complexes of dipyrido[3,2-a:2',3'-c]phenazines (dppz), 2,3-bis(2-pyridyl)quinoxalines (bpq) and 2,3-bis(dialkylphosphino)quinoxalines (QuinoxP). DFT calculations confirm the experimental results (structures, spectroscopy) and also point to the coordination potential of the quinoxaline N atoms. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2012
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