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Di Salvo, F.; Escola, N.; Scherlis, D.A.; Estrin, D.A.; Bondía, C.; Murgida, D.; Ramallo-López, J.M.; Requejo, F.G.; Shimon, L.; Doctorovich, F. "Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units" (2007) Chemistry - A European Journal. 13(30):8428-8436
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Abstract:

The nitrosyl in [IrCl5(NO)]- is probably the most electrophilic known to date. This fact is reflected by its extremely high IR frequency in the solid state, electrochemical behavior, and remarkable reactivity in solution. PPh4[IrCl5(NO)] forms a crystal in which the [IrCl5(NO)]- anions are in a curious wire-like linear arrangement, in which the distance between the N - O moiety of one anion and the trans chloride of the upper one nearby is only 2.8 Å. For the same complex [IrCl5(NO)]- but with a different counterion, Na[IrCl5(NO)], the anions are stacked one over the other in a side-by-side arrangement. In this case the electronic distribution can be depicted as the closed-shell electronic structure IrIII-NO +, as expected for any d6 third-row transition metal complex. However, in PPh4[IrCl5(NO)] an unprecedented electronic perturbation takes place, probably due to NȮ-Cl- acceptor-donor interactions among a large number of [IrCl5(NO)] - units, favoring a different electronic distribution, namely the open-shell electronic structure IrIV-NȮ. This conclusion is based on XANES experimental evidence, which demonstrates that the formal oxidation state for iridium in PPh4-[IrCl5(NO)] is +4, as compared with + 3 in K[IrCl5(NO)], In agreement, solid-state DFT calculations show that the ground state for [IrCl5(NO)]- in the PPh4+ salt comprises an open-shell singlet with an electronic structure which encompasses half of the spin density mainly localized on a metal-centered orbital, and the other half on an NO-based orbital. The electronic perturbation could be seen as an electron promotion from a metal-chloride to a metal-NO orbital, due to the small HOMO-LUMO gap in PPh 4-[IrCl5(NO)]. This is probably induced by electrostatic interactions acting as a result of the closeness and wire-like spatial arrangement of the Ir metal centers, imposed by lattice forces due to π-π stacking interactions among the phenyl rings in PPh4+. Experimental and theoretical data indicate that in PPh4[IrCl 5(NO)] the Ir - N - O moiety is partially bent and tilted. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.

Registro:

Documento: Artículo
Título:Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units
Autor:Di Salvo, F.; Escola, N.; Scherlis, D.A.; Estrin, D.A.; Bondía, C.; Murgida, D.; Ramallo-López, J.M.; Requejo, F.G.; Shimon, L.; Doctorovich, F.
Filiación:Departamento de Quimica Inorganica, Analitica y Quimica Fisica/INQUIMAE-CONICET, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina
Max Volmer Laboratory of Biophysical Chemistry, Institute of Chemistry, Technical University of Berlin, Strasse des 17, Juni 135, 10623 Berlin, Germany
INIFTA-IFLP (CONICHT), Departamento de Física, Universidad Nacional de la Plata, 1900 La Plata, Argentina
Department of Chemical Services, Weizmann Institute of Science, Rehovot 76100, Israel
Palabras clave:Electron transfer; Iridium, nanostructures; Nitrosyl; Valence isomerization; Electron promotion; Electrophils; Molecular nanowire; Nitrosyl; Phenyl rings; Electrochemical properties; Electronic equipment; Ground state; Nanowires; Negative ions; Perturbation techniques; Solid state device structures; Iridium compounds; iridium; nanowire; article; chemistry; Fourier analysis; oxidation reduction reaction; X ray crystallography; Crystallography, X-Ray; Fourier Analysis; Iridium; Nanowires; Oxidation-Reduction
Año:2007
Volumen:13
Número:30
Página de inicio:8428
Página de fin:8436
DOI: http://dx.doi.org/10.1002/chem.200601761
Título revista:Chemistry - A European Journal
Título revista abreviado:Chem. Eur. J.
ISSN:09476539
CODEN:CEUJE
CAS:iridium, 13967-67-4, 7439-88-5; Iridium, 7439-88-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09476539_v13_n30_p8428_DiSalvo

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Citas:

---------- APA ----------
Di Salvo, F., Escola, N., Scherlis, D.A., Estrin, D.A., Bondía, C., Murgida, D., Ramallo-López, J.M.,..., Doctorovich, F. (2007) . Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units. Chemistry - A European Journal, 13(30), 8428-8436.
http://dx.doi.org/10.1002/chem.200601761
---------- CHICAGO ----------
Di Salvo, F., Escola, N., Scherlis, D.A., Estrin, D.A., Bondía, C., Murgida, D., et al. "Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units" . Chemistry - A European Journal 13, no. 30 (2007) : 8428-8436.
http://dx.doi.org/10.1002/chem.200601761
---------- MLA ----------
Di Salvo, F., Escola, N., Scherlis, D.A., Estrin, D.A., Bondía, C., Murgida, D., et al. "Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units" . Chemistry - A European Journal, vol. 13, no. 30, 2007, pp. 8428-8436.
http://dx.doi.org/10.1002/chem.200601761
---------- VANCOUVER ----------
Di Salvo, F., Escola, N., Scherlis, D.A., Estrin, D.A., Bondía, C., Murgida, D., et al. Electronic perturbation in a molecular nanowire of [IrCl 5(NO)]- units. Chem. Eur. J. 2007;13(30):8428-8436.
http://dx.doi.org/10.1002/chem.200601761