Towards New Organometallic Wires: Tetraruthenium Complexes Bridged by Phenylenevinylene and Vinylpyridine Ligands

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2007
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Maurer, Jörg
Zális, Stanislav
Kaim, Wolfgang
Sarkar, Biprajit
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Chemistry - A European Journal. 2007, 13(36), pp. 10257-10272. ISSN 0947-6539. Available under: doi: 10.1002/chem.200700459
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The tetranuclear complexes [{(PiPr3)2(CO)ClRu(μ-CH[DOUBLE BOND]CHpy)Ru Cl(CO)(PPh3)2}2(μ-CH[DOUBLE BOND]CH-C6H4- CH[DOUBLE BOND]CH-1,4)] (3 a) and [{(PiPr3)2(CO)ClRu(μ-CH[DOUBLE BOND]CHpy)RuCl(CO)(PPh3)2}2(μ-CH[DOUBLE BOND]CH-C6H4-CH[DOUBLE BOND]CH-1,3)] (3 b), which contain vinylpyridine ligands that connect peripheral Ru(PiPr3)2(CO)Cl units to a central divinylphenylene-bridged diruthenium core, have been prepared and investigated. These complexes, in various oxidation states up to the tetracation level, have been characterized by standard electrochemical and spectroelectrochemical techniques, including IR, UV/Vis/NIR and ESR spectroscopy. A comparison with the results for the vinylpyridine-bridged dinuclear complex [PiPr3)2(CO)ClRu(μ-CH[DOUBLE BOND]CHpy)RuCl(CO)(PPh3)2(CH[DOUBLE BOND]CHPh)] (6) and the divinylphenylene-bridged complexes [{(EtOOCpy)(CO)Cl(PPh3)2Ru}2(μ-CH[DOUBLE BOND]CH-C6H4-CH[DOUBLE BOND]CH-1,4)] (8 a) and [{(EtOOCpy)(CO)Cl(PPh3)2Ru}2(μ-CH[DOUBLE BOND]CH-C6H4-CH[DOUBLE BOND]CH-1,3)] (8 b), which represent the outer sections (6) or the inner core (8 a,b) of complexes 3 a,b, and with the mononuclear complex [(EtOOCpy)(CO)(PPh3)2RuCl(CH[DOUBLE BOND]CHPh)] (7) indicate that every accessible oxidation process is primarily centred on one of the vinyl ligands, with smaller contributions from the metal centres. The experimental results and quantum chemical calculations indicate charge- and spin-delocalization across the central divinylphenylenediruthenium part of 3 a,b or the styrylruthenium unit of 6, but not beyond. The energy gap between the higher lying styryl- or divinylphenylenediruthenium-based and the lower occupied vinylpyridineruthenium-based orbitals increases in the order 6<3 b<3 a and thus follows the conjugation within the non-heteroatom-substituted aromatic vinyl ligand.

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ISO 690WINTER, Rainer F., Jörg MAURER, Stanislav ZÁLIS, Wolfgang KAIM, Biprajit SARKAR, 2007. Towards New Organometallic Wires: Tetraruthenium Complexes Bridged by Phenylenevinylene and Vinylpyridine Ligands. In: Chemistry - A European Journal. 2007, 13(36), pp. 10257-10272. ISSN 0947-6539. Available under: doi: 10.1002/chem.200700459
BibTex
@article{Winter2007Towar-13827,
  year={2007},
  doi={10.1002/chem.200700459},
  title={Towards New Organometallic Wires: Tetraruthenium Complexes Bridged by Phenylenevinylene and Vinylpyridine Ligands},
  number={36},
  volume={13},
  issn={0947-6539},
  journal={Chemistry - A European Journal},
  pages={10257--10272},
  author={Winter, Rainer F. and Maurer, Jörg and Zális, Stanislav and Kaim, Wolfgang and Sarkar, Biprajit}
}
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