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Undetermined (271)
English (164)
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438 research data, page 1 of 44

Dynamics of femtosecond laser-induced breakdown in water from femtoseconds to microseconds

Chris B. Schaffer; Nozomi Nishimura; Eli N. Glezer; Albert M.-T. Kim; Eric Mazur (2002)
Publisher: Figshare
Using time-resolved imaging and scattering techniques, we directly and indirectly monitor the breakdown dynamics induced in water by femtosecond laser pulses over eight orders of magnitude in time. We resolve, for the first time, the picosecond plasma dynamics and observe a 20 ps delay before the laser-produced plasma expands. We attribute this delay to the electron-ion energy transfer time.

Copper Trafficking: The Solution Structure of Bacillus subtilis CopZ

Banci, L.,;Bertini, I.,;Del Conte, R.,;Markey, J.,;Ruiz-Duenas, F., J., (2002)
Publisher: Biological Magnetic Resonance Bank

From Monomer Zinc−Oxamato Complexes to Tetranuclear Inverse 12-Membered and Octanuclear 12-Membered Metallacrowns

Alexiou, Maria; Dendrinou-Samara, Catherine; Raptopoulou, Catherine P.; Terzis, Aris; Kessissoglou, Dimitris P. (2002)
Publisher: Figshare
Interaction of ZnCl2 with Hpko (Hpko, di-2-pyridyl-ketonoxime) results in the formation of a uninuclear Zn(Hpko)Cl2 (1) compound or in a 12-membered tetranuclear metallacrown (OH)2[inv12-MCZn(II)N(pko)-4]Cl2 (2) depending on the pH of the mother solution. The addition of H3shi (H3shi, salicylhydroxamic acid) leads to the formation of the octanuclear 12-membered tetranuclear metallacrown [Zn2]{[Zn2(pko)4][12-MCZn(II)N(shi)-4](CH3OH)2} (3). The metallacrown core of 2 is characterized a...

Mechanistic Aspects in the Generation of Apparent Ultrahigh Efficiencies for Colloidal (Microbial) Electrokinetic Separations

Armstrong, Daniel W.; Girod, Marco; He, Lingfeng; Rodriguez, Michael A.; Wei; Zheng, Jinjian; Yeung, Edward S. (2002)
Publisher: Figshare
Under specific experimental conditions, the electrokinetic separation of certain microorganisms can produce peaks of very high apparent efficiencies (∼106−1010 theoretical plates/m). This is unusual in that no deliberate focusing mechanism was employed. To investigate this process further, the separation was monitored in real time using a charge-coupled device (CCD) imaging system. At least two different processes seem to be operative when these narrow peaks are observ...

Multifrequency analysis for the Helmholtz equation

Köhl, Mirjam; Rjasanow, Sergej (2002)
Publisher: Universität des Saarlandes
Embargo end date: 2011/12/02

Estimates of the Ab Initio Limit for π−π Interactions:  The Benzene Dimer

Sinnokrot, Mutasem Omar; Valeev, Edward F.; Sherrill, C. David (2002)
Publisher: Figshare
State-of-the-art electronic structure methods have been applied to the simplest prototype of aromatic π−π interactions, the benzene dimer. By comparison to results with a large aug-cc-pVTZ basis set, we demonstrate that more modest basis sets such as aug-cc-pVDZ are sufficient for geometry optimizations of intermolecular parameters at the second-order Møller−Plesset perturbation theory (MP2) level. However, basis sets even larger than aug-cc-pVTZ are important for accurate binding...

A Family of Vanadate Esters of Monoionized and Diionized Aromatic 1,2-Diols: Synthesis, Structure, and Redox Activity

Baruah, Bharat; Das, Samir; Chakravorty, Animesh (2002)
Publisher: Figshare
The concerned diols (general abbreviation, H2L) are catechol (H2L1) and its 3,5-But2 derivative (H2L2). Esters of the type VO(xsal)(HL), 2, are obtained by reacting H2L with VO(xsal)(H2O) or VO(xsal)(OMe)(HOMe), where xsal2- is the diionized salicylaldimine of glycine (x = g), l-alanine (x = a), or l-valine (x = v). The reaction of VO(acac)2 with H2L and the salicylaldimine (Hpsal) of 2-picolylamine has furnished VO(psal)(L), 3. In the structures of VO(gsal)(HL1), 2a, and VO(vsal)(HL...

Synthesis and Characterization of Phosphorescent Cyclometalated Platinum Complexes

Brooks, Jason; Babayan, Yelizaveta; Lamansky, Sergey; Djurovich, Peter I.; Tsyba, Irina; Bau, Robert; Thompson, Mark E. (2002)
Publisher: Figshare
The synthesis, electrochemistry, and photophysics of a series of square planar Pt(II) complexes are reported. The complexes have the general structure C∧NPt(O∧O),where C∧N is a monoanionic cyclometalating ligand (e.g., 2-phenylpyridyl, 2-(2‘-thienyl)pyridyl, 2-(4,6-difluorophenyl)pyridyl, etc.) and O∧O is a β-diketonato ligand. Reaction of K2PtCl4 with a HC∧N ligand precursor forms the chloride-bridged dimer, C∧NPt(μ-Cl)2PtC∧N, which is cleaved with β-diketones such as acetyl acet...

Synthesis and Alkali Metal Ion-Binding Properties of a Chromium(III) Triacetylide Complex

Berben, Louise A.; Long, Jeffrey R. (2002)
Publisher: Figshare
A simple triacetylide complex of chromium(III) is synthesized for use as a potential precursor to metal-dicarbide clusters. Reaction of Me3SiCCLi with [(Me3tacn)Cr(CF3SO3)3] (Me3tacn = N,N‘,N‘‘-trimethyl-1,4,7-triazacyclononane) in THF generates [(Me3tacn)Cr(CCSiMe3)3], which subsequently reacts with Bu4NF to supply [(Me3tacn)Cr(CCH)3] as an air-stable orange solid. The crystal structure of this unprecedented triacetylide complex reveals octahedral coordination of the chromium center, with li...

Synthetic Models of the Reduced Active Site of Superoxide Reductase

Halfen, Jason A.; Moore, Heather L.; Fox, Derek C. (2002)
Publisher: Figshare
We report the synthesis, structural and spectroscopic characterization, and magnetic and electrochemical studies of a series of iron(II) complexes of the pyridyl-appended diazacyclooctane ligand L8py2, including several that model the square-pyramidal [FeII(Nhis)4(Scys)] structure of the reduced active site of the non-heme iron enzyme superoxide reductase. Combination of L8py2 with FeCl2 provides [L8py2FeCl2] (1), which contains a trigonal-prismatic hexacoordinate iron(II) center,...