Alkyl‐ und Arylrheniumtrioxide

Herrmann, Wolfgang A.; Romão, Carlos C.; Fischer, Richard W.; Kiprof, Paul; Bellefon, Claude de

doi:10.1002/ange.19911030212

Cited by 39 publications

(7 citation statements)

References 11 publications

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“…Es ist bekannt, dass Alkylrhenium(VII)‐oxide auch mithilfe von Dialkylzink‐Verbindungen hergestellt werden können 8. Allerdings führt der Einsatz von Dimethylzink zu einem nicht unerheblichen Anteil an Reduktionsprodukten bei der Reaktion mit Re 2 O 7 oder ähnlichen Rhenium(VII)‐Vorstufen 5.…”

Section: Synthese Von Alkylrhenium(vii)‐oxidenunclassified

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Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads

Handa

Giacalone

Haque

et al. 2005

Chemistry A European J

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The charge-recombination dynamics of two exTTF-C60 dyads (exTTF = 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene), observed after photoinduced charge separation, are compared in solution and in the solid state. The dyads differ only in the degree of conjugation of the bridge between the donor (exTTF) and the acceptor (C60) moieties. In solution, photoexcitation of the nonconjugated dyad C60-BN-exTTF (1) (BN = 1,1'-binaphthyl) shows slower charge-recombination dynamics compared with the conjugated dyad C60-TVB-exTTF (2) (TVB = bisthienylvinylenebenzene) (lifetimes of 24 and 0.6 micros, respectively), consistent with the expected stronger electronic coupling in the conjugated dyad. However, in solid films, the dynamics are remarkably different, with dyad 2 showing slower recombination dynamics than 1. For dyad 1, recombination dynamics for the solid films are observed to be tenfold faster than in solution, with this acceleration attributed to enhanced electronic coupling between the geminate radical pair in the solid film. In contrast, for dyad 2, the recombination dynamics in the solid film exhibit a lifetime of 7 micros, tenfold slower than that observed for this dyad in solution. These slow recombination dynamics are assigned to the dissociation of the initially formed geminate radical pair to free carriers. Subsequent trapping of the free carriers at film defects results in the observed slow recombination dynamics. It is thus apparent that consideration of solution-phase recombination data is of only limited value in predicting the solid-film behaviour. These results are discussed with reference to the development of organic solar cells based upon molecular donor-acceptor structures.

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Section: Synthese Von Alkylrhenium(vii)‐oxidenunclassified

“…Nach Entfernen des Lösungsmittels im Vakuum wurde Ethyltrioxorhenium(VII) erhalten. Die analytischen Daten stimmen mit den Literaturwerten überein 8…”

Section: Experimentellesunclassified

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads

Handa

Giacalone

Haque

et al. 2005

Chemistry A European J

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“…The analytical data correspond to those in literature. [8] Received: July 6, 2007 Published online: August 21, 2007 …”

Section: Methodsmentioning

confidence: 99%

“…[8] However, dimethylzinc entails significant reduction of Re VII when exposed to Re 2 O 7 and related Re VII precursor compounds. [5,9] We have now discovered unexpectedly that clean methylation without any reduction occurs when methylzinc acetate [10] is allowed to react with perrhenylacetate [Eq.…”

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confidence: 99%

A Cheap, Efficient, and Environmentally Benign Synthesis of the Versatile Catalyst Methyltrioxorhenium (MTO)

et al. 2007

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“…cyclohexyl, p-tolyl, bis o-tolyl, bipyrimidine and phenanthroline, were synthesized (Fig. 28 The MoO 2 (R) 2 L 2 complexes can be handled in air for brief periods of time. 27 These complexes are much more soluble than their halogenated precursors and, therefore, are much more suitable for a detailed spectroscopic characterization.…”

Section: Alkylated Molybdenum(vi) Oxide Complexesmentioning

confidence: 99%

Organorhenium(VII) and organomolybdenum(VI) oxides: synthesis and application in oxidation catalysis

Kühn¹,

Santos²,

Gonçalves³

et al. 2001

Appl. Organometal. Chem.

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Methyltrioxorhenium(VII) has found numerous applications in various catalytic processes.In olefin epoxidation its activity can be enhanced by the addition of aromatic Lewis base nitrogen donor ligands, e.g. pyridines and pyrazoles. Due to the comparatively weak coordination of these ligands, a significant excess has to be used. Therefore the MTO/chiral Lewis base/H 2 O 2 system is not very useful for chiral epoxidations. In contrast to this, dimethyldioxomolybdenum (VI) MoO 2 (CH 3 ) 2 undergoes a significantly stronger interaction with Lewis bases and seems, despite its generally somewhat lower activity, a reasonable candidate for application in chiral epoxidation reactions together with an appropriate chiral Lewis base ligand. Complexes of the type MoO 2 (CH 3 ) 2 L are accessible via MoO 2 X 2 L (X = Cl, Br). These latter compounds are even more active in olefin epoxidation than MoO 2 (CH 3 ) 2 L. Unfortunately, however, all the Mo(VI) complexes mentioned above need t-butyl hydroperoxide as oxidizing agent and do not show activity in the presence of H 2 O 2 .Scheme 1 Oxidation processes catalyzed by MTO. APPLIED ORGANOMETALLIC CHEMISTRY Appl. Organometal. Chem. 2001; 15: 43-50

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Alkyl‐ und Arylrheniumtrioxide

Abstract: Abb. 2. Stereoskopische Darstellung der Umgebung der Kalium-lonen (Schwingungsellipsoide mil 30 YO Wahrscheinlichkeit). Der besseren Ubersicht wegen wurde auf die Abbildung der Methylgruppen (C21 und C22) und des Wasserstoffatoms H21 an C2 verzichtet. Wichtige Abstande [pm] und Winkel

Cited by 39 publications

References 11 publications

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads

A Cheap, Efficient, and Environmentally Benign Synthesis of the Versatile Catalyst Methyltrioxorhenium (MTO)

Organorhenium(VII) and organomolybdenum(VI) oxides: synthesis and application in oxidation catalysis

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Alkyl‐ und Arylrheniumtrioxide

Abstract: Abb. 2. Stereoskopische Darstellung der Umgebung der Kalium-lonen (Schwingungsellipsoide mil 30 YO Wahrscheinlichkeit). Der besseren Ubersicht wegen wurde auf die Abbildung der Methylgruppen (C21 und C22) und des Wasserstoffatoms H21 an C2 verzichtet. Wichtige Abstande [pm] und Winkel

Cited by 39 publications

References 11 publications

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C60 Dyads

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C60 Dyads

A Cheap, Efficient, and Environmentally Benign Synthesis of the Versatile Catalyst Methyltrioxorhenium (MTO)

Organorhenium(VII) and organomolybdenum(VI) oxides: synthesis and application in oxidation catalysis

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Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads

Solid Film versus Solution‐Phase Charge‐Recombination Dynamics of exTTF–Bridge–C₆₀ Dyads