Počet záznamů: 1

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](+)

  1. 1.
    0358741 - UFCH-W 2012 RIV GB eng J - Článek v odborném periodiku
    Bulak, E. - Varnali, T. - Schwederski, B. - Sarkar, B. - Hartenbach, I. - Fiedler, Jan - Kaim, W.
    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](+).
    Dalton Transactions. Roč. 40, č. 12 (2011), s. 2757-2763 ISSN 1477-9226
    Grant CEP: GA MŠk LD11086; GA MŠk(CZ) LD11082
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: plainum(II) diimine complexes * polypyridyl ligands * dinuclear complexes
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.838, rok: 2011

    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.
    Trvalý link: http://hdl.handle.net/11104/0196687