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Dive into the research topics where Ryan E. Powers is active.

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Featured researches published by Ryan E. Powers.


Angewandte Chemie | 1998

The self-assembly of a predesigned tetrahedral M4L6 supramolecular cluster

Dana L. Caulder; Ryan E. Powers; Tatjana N. Parac; Kenneth N. Raymond

A remarkable selectivity on the basis of size is observed for the encapsulation of Et4N+ in the presence of Me4N+ and Pr4N+ by a predesigned [Ga4L6]12− homochiral tetrahedral cluster (L=bis-bidentate ligand). Immediate and quantitative stepwise replacement of R4N+ counterions in the cluster cavity is observed by 1H NMR spectroscopy (see below). The encapsulation of Et4N+ is also observed in the solid state.


Angewandte Chemie | 1998

SYMMETRY-DRIVEN RATIONAL DESIGN OF A TETRAHEDRAL SUPRAMOLECULAR TI4L4 CLUSTER

Christian Brückner; Ryan E. Powers; Kenneth N. Raymond

General design principles for the formation of tetrahedral M4L4 clusters (L=ligand) are outlined and exemplified by the formation and structure of the [Ti4L4]8− species pictured on the right.


Angewandte Chemie | 1998

Selbstorganisation eines supramolekularen tetraedrischen M4L6‐Clusters

Dana L. Caulder; Ryan E. Powers; Tatjana N. Parac; Kenneth N. Raymond

Nicht zu gros und nicht zu klein sollte der Gast im Hohlraum sein: Der homochirale tetraedrische Cluster [Ga4L6]12− weist eine hohe Selektivitat fur den Einschlus von Et4N+ gegenuber Pr4N+ auf, das seinerseits eingeschlossenes Me4N+ verdrangt (L=zweifach zweizahniger Ligand); dieser sukzessive Austausch von R4N+-Ionen verlauft 1H-NMR-spektroskopischen Untersuchungen zufolge schnell und quantitativ (siehe unten). Der Einschlus von Et4N+ wurde auch im Festkorper nachgewiesen.


Angewandte Chemie | 1999

Exploiting Incommensurate Symmetry Numbers: Rational Design and Assembly of M2M3′L6 Supramolecular Clusters with C3h Symmetry

Xiankai Sun; Darren W. Johnson; Dana L. Caulder; Ryan E. Powers; Kenneth N. Raymond; Edward H. Wong

Mixed-metal mesocates [M2 Pd3 Br6 L6 ]4- (M=TiIV , SnIV ; L=4-diphenylphosphanyl-catecholate) have been synthesized, in which the two incommensurate symmetry elements generated by the different metal ions are linked by a rigid, bifunctional ligand to generate a C3h -symmetrical cluster (see picture).


Angewandte Chemie | 1998

SYMMETRIEGESTEUERTES RATIONALES DESIGN EINES TETRAEDRISCHEN SUPRAMOLEKULAREN TI4L4-CLUSTERS

Christian Brückner; Ryan E. Powers; Kenneth N. Raymond

Allgemeingultige Prinzipien fur das Design von tetraedrischen M4L4-Clustern (L=Ligand) werden am Beispiel der Bildung und Struktur der rechts abgebildeten [Ti4L4]8−-Spezies naher erlautert.


Journal of the American Chemical Society | 2001

Design, Formation and Properties of Tetrahedral M4L4 and M4L6 Supramolecular Clusters1

Dana L. Caulder; Christian Brückner; Ryan E. Powers; Stefan König; Tatjana N. Parac; and Julie A. Leary; Kenneth N. Raymond


Angewandte Chemie | 1996

SYMMETRY-BASED METAL COMPLEX CLUSTER FORMATION

Thomas Beissel; Ryan E. Powers; Kenneth N. Raymond


Journal of the American Chemical Society | 1996

Dinuclear Catecholate Helicates: Their Inversion Mechanism

Berthold Kersting; Michel Meyer; Ryan E. Powers; Kenneth N. Raymond


Inorganic Chemistry | 1997

Rearrangement Reactions in Dinuclear Triple Helicates1

Michel Meyer; Berthold Kersting; Ryan E. Powers; Kenneth N. Raymond


Journal of the American Chemical Society | 1999

Dynamic Isomerization of a Supramolecular Tetrahedral M4L6 Cluster1

Thomas Beissel; Ryan E. Powers; and Tatjana N. Parac; Kenneth N. Raymond

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Thomas Beissel

University of California

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Xiankai Sun

University of New Hampshire

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