Elektronentransfer und Ionenpaar-Bildung, 47 [1]. Titrationen von 1,2,4,5-Tetracyanbenzol und 7,7,8,8-Tetracyan-p-chinodimethan mit Natriummetall in aprotischen Lösungen

Electron transfer and ion pair formation, 47 [1]. Titrations of 1,2,4,5-tetracyanobenzene and 7,7,8,8-tetracyano-p-quinodimethane with sodium metal in aprotic solutions

  • In an especially designed and sealed glass apparatus, a combination of UV/VIS and ESR spectroscopy measurements are performed to follow electron transfer reactions in aprotic (cH⊕ < 0,1 ppm) solution. For the sodium metal reductions of the tetracyano-substituted title compounds, the novel technique provides the following detailed information: 1,2,4,5- tetracyanobenzene is uniformly reduced to its radical anion, for which additional geometryoptimized MNDO calculations predict an already significant cyanine disortion. For 7,7,8,8- tetracyano-p-quinodimethane, UV/VIS band shape analysis allows to detect in the saturated THF reduction solution the 16300 cm-1 absorption of the donor/acceptor complex formed in the equilibrium TCNQ·⊖ + TCNQ ⇆ {TCNQ·⊖···TCNQ}, which according to a literature search has been crystallized and structurally characterized in paramagnetic salts such as [Me2⊕ (TCNQ·⊖)2(TCNQ)].

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Metadaten
Author:Hans BockGND, Markus KleineGND
URN:urn:nbn:de:hebis:30:3-811876
DOI:https://doi.org/10.1515/znb-1996-0901
ISSN:1865-7117
ISSN:0932-0776
Parent Title (German):Zeitschrift für Naturforschung, B
Publisher:Verlag der Zeitschrift für Naturforschung
Place of publication:Tübingen
Document Type:Article
Language:German
Date of Publication (online):2014/06/02
Year of first Publication:1996
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/01/22
Tag:1,2,4,5-Tetracyanobenzene; 7,7,8,8-Tetracyano-p-quinodimethane; Sodium Metal Reduction; UV/VIS Spectra
Volume:51.1996
Issue:9
Page Number:7
First Page:1215
Last Page:1221
Institutes:Biochemie, Chemie und Pharmazie / Biochemie und Chemie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung-Nicht kommerziell-Keine Bearbeitung 3.0