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Undetermined (332)
English (202)
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537 research data, page 1 of 54

Excited-State Energy-Transfer Dynamics in Self-Assembled Triads Composed of Two Porphyrins and an Intervening Bis(dipyrrinato)metal Complex

Yu, Lianhe; Muthukumaran, Kannan; Sazanovich, Igor V.; Kirmaier, Christine; Hindin, Eve; Diers, James R.; Boyle, Paul D.; Bocian, David F.; Holten, Dewey; Lindsey, Jonathan S. (2003)
Publisher: Figshare
The synthesis and characterization of various triads composed of a linear array of two zinc porphyrins joined via an intervening bis(dipyrrinato)metal(II) complex are reported. The preparation exploits the facile complexation of dipyrrins with divalent metal ions to give bis(dipyrrinato)metal(II) complexes [abbreviated (dp)2M]. Copper(II) and palladium(II) chelates of dipyrrins (available by oxidation of dipyrromethanes) were prepared in 50−80% yield. A one-flask synthesis of bis(...

Enantiospecific Formal Total Synthesis of the Tumor and GSK-3β Inhibiting Alkaloid, (−)-Agelastatin A

Hale, Karl J.; Domostoj, Mathias M.; Tocher, Derek A.; Irving, Ed; Scheinmann, Feodor (2003)
Publisher: Figshare
An enantiospecific total synthesis of Weinreb's advanced intermediate 2 for (−)-agelastatin A has been achieved from the Hough−Richardson aziridine 8. Noteworthy reactions in our sequence include the highly regioselective trans-diaxial ring-opening of 8 with azide ion to set up the vicinal diamido functionality present within (−)-2 and the Grubbs−Hoveyda ring-closing metathesis (RCM) reaction that was used to construct its cyclopentene core.

Synthesis, Structures, and Conformational Characteristics of Calixarene Monoanions and Dianions

Hanna, Tracy A.; Liu, Lihua; Angeles-Boza, Alfredo M.; Kou, Xiaodi; Gutsche, C. David; Ejsmont, Krzysztof; Watson, William H.; Zakharov, Lev N.; Incarvito, Christopher D.; Rheingold, Arnold L. (2003)
Publisher: Figshare
The synthesis, complete characterization, and solid state structural and solution conformation determination of calix[n]arenes (n = 4, 6, 8) is reported. A complete series of X-ray structures of the alkali metal salts of calix[4]arene (HC4) illustrate the great influence of the alkali metal ion on the solid state structure of calixanions (e.g., the Li salt of monoanionic HC4 is a monomer; the Na salt of monoanionic HC4 forms a dimer; and the K, Rb, and Cs salts exist in polymeric ...

Mechanism for the Separation of Large Molecules Based on Radial Migration in Capillary Electrophoresis

Zheng, Jinjian; Yeung, Edward S. (2003)
Publisher: Figshare
We demonstrate a novel separation mechanism for large molecules based on their radial migration in capillary electrophoresis with applied hydrodynamic flow (HDF). The direction of radial migration depends on the direction of the applied HDF relative to the electric field. The radial migration velocities are size-dependent, which could be attributed to the different degree of deformation under shear flow. Analytical separation was demonstrated on a sample plug containin...

Sometimes You Just Have to Leave: Domestic Threats and Forced Migration, 1964-1989

Davenport, Christian A.; Moore, Will H.; Poe, Steven C. (2003)
Publisher: ICPSR - Interuniversity Consortium for Political and Social Research
This study reports the statistical analyses of an argument about the co-variates of refugee flows.

A Novel Family of Structurally Characterized Lithium Cobalt Double Aryloxides and the Nanoparticles and Thin Films Generated Therefrom

Boyle, Timothy J.; Rodriguez, Mark A.; Ingersoll, David; Headley, Thomas J.; Bunge, Scott D.; Pedrotty, Dawn M.; De'Angeli, Sacha M.; Vick, Sara C.; Fan, Hongyou (2003)
Publisher: Figshare
The reaction between LiN(SiMe3)2 and Co(N(SiMe3)2)2 in THF followed by the addition of an aryl alcohol (HOAr) yielded:  [Co[(μ-OAr)2Li(THF)x]2 [where x = 2:  OAr =:  OC6H4Me-2 (oMP, 1), OC6H4(OCHMe2)-2 (oPP, 2), OC6H3(Me)2-2,6 (DMP, 3); where x = 1:  OAr = OC6H3(OCHMe2)2-2,6 (DIP, 4)]. Undertaking the same synthesis in pyridine (py) led to the same general structure with py molecules substituted for the THF solvent molecules:  [Co[(μ-OAr)2Li(py)2]2 (OAr = oMP (5), oPP (6)]. For 1−6, ...

Seawater carbonate chemistry, photosynthesis, respiration and calcification during experiments with scleractinian coral Stylophora pistillata, 2003

Stéphanie Reynaud; Nicolas Leclercq; Samantha Romaine-Lioud; Christine Ferrier-Pagès; Jean Jaubert; Jean-Pierre Gattuso (2003)
Publisher: PANGAEA
Projects: EC | EPOCA (211384)

Carbon Dioxide Emission Estimates from Fossil-Fuel Burning, Hydraulic Cement Production, and Gas Flaring for 1995 on a One Degree Grid Cell Basis

Environmental Sciences Division, Oak Ridge National Laboratory (2003)
Publisher: Carbon Dioxide Information Analysis Center (CDIAC)

PanMap - a Mini-GIS (Geographical Information System) to draw point and vector data in maps including geographical resources

Grobe, Hannes; Diepenbroek, Michael; Siems, Uwe (2003)
Publisher: PANGAEA - Data Publisher for Earth & Environmental Science

Melt Morphology of Polystyrene−Poly(ethylene oxide) Metallo-Supramolecular Diblock Copolymer

Al-Hussein, M.; Lohmeijer, B. G. G.; Schubert, U. S.; de Jeu, W. H. (2003)
Publisher: Figshare
Melt Morphology of Polystyrene−Poly(ethylene oxide) Metallo-Supramolecular Diblock Copolymer