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Abstract:

The new complexes [(μ4,η4-TCNX){Os(PR3) 2(CO)(H)Cl}4], R = isopropyl, TCNX = tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] or 1,2,4,5-tetracyanobenzene (TCNB), were studied by spectroelectrochemistry in the UV/VIS/NIR and IR regions and by EPR spectroscopy. Both compounds are reduced in two reversible steps and oxidized in a two-electron process (reversible for TCNQ, quasi-reversible for TCNB). In all oxidation states studied (-, 0, 2+) the TCNQ complexes exhibited intense long-wavelength absorptions in the near IR region (λmax > 1000 nm). The EPR spectra of the monoanionic forms exhibit hardly any g anisotropy and thus very little metal participation, suggesting an oxidation state formulation [(TCNX•-)(OsII)4]. The dication of the TCNQ system is formulated as [(TCNQ)(Os2.5)4] with an intervalence transfer transition at λmax = 1245 nm (ε = 50 000 M-1 cm-1). In the solid state, the neutral complexes show temperature dependent paramagnetism that could be fitted with a model implying two coupled S = 1/2 entities.

Registro:

Documento: Artículo
Título:Tetranuclear osmium complexes of tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism
Autor:Baumann, F.; Kaim, W.; Olabe, J.A.; Parise, A.R.; Jordanov, J.
Filiación:Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
Dept. de Quim. Inorgánica, Analítica y Química Física (Inquimae), Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Buenos Aires, Capital Federal 1428, Argentina
Centre d'Etudes Nucléaires de Grenoble, DRFMC/SCIB/SCPM, 85 X, F-38054 Grenoble Cedex 09, France
Año:1997
Número:22
Página de inicio:4455
Página de fin:4459
Título revista:Journal of the Chemical Society - Dalton Transactions
ISSN:03009246
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009246_v_n22_p4455_Baumann

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Citas:

---------- APA ----------
Baumann, F., Kaim, W., Olabe, J.A., Parise, A.R. & Jordanov, J. (1997) . Tetranuclear osmium complexes of tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism. Journal of the Chemical Society - Dalton Transactions(22), 4455-4459.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009246_v_n22_p4455_Baumann [ ]
---------- CHICAGO ----------
Baumann, F., Kaim, W., Olabe, J.A., Parise, A.R., Jordanov, J. "Tetranuclear osmium complexes of tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism" . Journal of the Chemical Society - Dalton Transactions, no. 22 (1997) : 4455-4459.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009246_v_n22_p4455_Baumann [ ]
---------- MLA ----------
Baumann, F., Kaim, W., Olabe, J.A., Parise, A.R., Jordanov, J. "Tetranuclear osmium complexes of tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism" . Journal of the Chemical Society - Dalton Transactions, no. 22, 1997, pp. 4455-4459.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009246_v_n22_p4455_Baumann [ ]
---------- VANCOUVER ----------
Baumann, F., Kaim, W., Olabe, J.A., Parise, A.R., Jordanov, J. Tetranuclear osmium complexes of tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism. 1997(22):4455-4459.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009246_v_n22_p4455_Baumann [ ]