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Radical Complexes (radical + complex)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

A Persistent Dipotassium 1,2,4-Diazaphospholide Radical Complex: Synthesis, X-Ray Structure, and Bonding,

ANGEWANDTE CHEMIE, Issue 10 2010
Chengfu Pi Dr.
Beständiges Radikal: Ein stabiler dianionischer 1,2,4-Diazaphospholid-Radikalkomplex (siehe Bild; N,blau, P,lila, K,türkis, O,rot) mit Tripeldecker-Konformation wurde durch Einelektronenreduktion des 1,2,4-Diazaphospholid-Anions mit Kalium in Gegenwart von [18]Krone-6 hergestellt. Rechnungen zufolge ist das ungepaarte Elektron im [3,5-Ph2dp].2, -Radikalanion über alle drei Ringe des 1,2,4-Diazaphospholids und das Phosphoratom delokalisiert. [source]

Electromeric Rhodium Radical Complexes,

ANGEWANDTE CHEMIE, Issue 11 2010
Florian, Frank Puschmann Dipl.-Chem.
No abstract is available for this article. [source]

Electromeric Rhodium Radical Complexes,

ANGEWANDTE CHEMIE, Issue 2 2010
Florian, Frank Puschmann Dipl.-Chem.
Radikale Änderungen: Nur ein einzelner P-Rh-P-Winkel bestimmt, ob das ungepaarte Elektron im paramagnetischen Komplex [Rh(trop2PPh)(PPh3)] über das gesamte Molekül delokalisiert ist (siehe Bild, blau, 165.5°) oder in der P-Rh-Einheit lokalisiert ist (rot, 122.0°). Die beiden energetisch nahezu entarteten Elektromere liegen in einem schnellen Gleichgewicht vor, und der ,rote" Komplex weist unter allen niedervalenten Rhodium-Komplexen die bislang höchste Spindichte am Rhodium-Zentrum auf. [source]

Synthesis and Electrochemical Study of an Original Copper(II)-Capped Salen,Cyclodextrin Complex

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 29 2010
Elise Deunf
Abstract A new metallocapped cyclodextrin (CD) was synthesized by the regioselective debenzylation, induced by diisobutylaluminium hydride (DIBAL-H), of perbenzylated cyclodextrins. This reaction allowed for the efficient preparation of an unprecedented CD,salen type copper(II) complex. The electrochemical behavior of both the bound and unbound CD,salen compounds was investigated by cyclic voltammetry. Notably, it was shown that the presence of tert -butyl groups at the ortho - and para -positions of the salen aromatic rings stabilized the copper(II) phenoxyl radical species that was generated upon the one-electron oxidation of the starting compound. Importantly, this stabilization remained effective when the salen-type ligand was covalently attached to the CD. This allowed for investigations of the reactivity of the copper(II) phenoxyl radical complex towards a primary alcohol to be performed by cyclic voltammetry. This reaction can be considered as mimicking the behavior of galactose oxidase. However, under these conditions, no reactivity was observed in the presence of benzyl alcohol. This may be due to distortion, either of the initially square planar salen ligand after its grafting to the CD primary face, and/or of the CD itself. On the other hand, the electrochemical reduction of the un-grafted copper(II) salen-type ligand led to a transient anionic species that exhibited significant stability on the time-scale of the slow cyclic voltammetry measurement in the absence of the CD, but was unstable in the presence of the CD. In the latter case, it was demonstrated that the anionic species was protonated by the CD. Importantly, this protonation was not fast enough to prevent catalytic activation of iodomethane by the electro-generated copper(I)-capped salen CD complex. [source]