1,721,106 research outputs found
A homoleptic zirconium complex with four bulky eta(2)-pyrazolato ligands
No full textTwo new tetrakis(eta(2)-pyrazolato) zirconium complexes are prepared from the reaction of Zr(CH2Ph)(4) with bulky pyrazolate ligands bearing indenylmethyl (HL1) or fluorenylmethyl (HL2) substituents, respectively. Zr(L-2)(4) has been analyzed by X-ray crystallography, which represents the first structural characterisation of a homoleptic eta(2)-pyrazolato zirconium compound
Bifunctional Cp boolean AND N complexes - Unusual structural features and electronic coupling in highly preorganized bimetallic systems
No full textA homoleptic zirconium complex with four bulky eta(2)-pyrazolato ligands
No full textTwo new tetrakis(eta(2)-pyrazolato) zirconium complexes are prepared from the reaction of Zr(CH2Ph)(4) with bulky pyrazolate ligands bearing indenylmethyl (HL1) or fluorenylmethyl (HL2) substituents, respectively. Zr(L-2)(4) has been analyzed by X-ray crystallography, which represents the first structural characterisation of a homoleptic eta(2)-pyrazolato zirconium compound
8. Brochetta C., Perrotta M.G., Jeromin A., Romano M., Soranzo MR., Borelli V., Roder J. And Zabucchi G. Identification and Subcellular Localization of Neurtonal Calcium Sensor-1 (NCS-1) in Human Neutrophils and HL-60 cells.
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Underdamped commensurate dynamics in a driven Frenkel-Kontorova-type model
No full textThe dynamics of a Frenkel-Kontorova chain subject to a substrate potential with a multiple-well structure and driven by an external dc force is studied in the underdamped regime. Making a rational choice among the three inherent length scales characterizing the system allows us to consider the possible formation of commensurate structures during sliding over the complex on-site potential. We comment both on the nature of the particle dynamics in the vicinity of the pinning-depinning transition point, and on the dynamical states displayed during the chain motion at different strengths of the dc driving. Varying the number of particles in the simulations allows us to consider, on a multiple-well substrate, the role played by the coverage variable on the depinning mechanism. The dependence of the minimal force required to initiate the chain motion (static friction) on the ratio of the model interaction strengths is analyzed and compared to the well-known case of the standard Frenkel-Kontorova model, which has only two inherent lengths
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Combining organometallic and Werner-type coordination sites in highly preorganized heterobimetallic systems
No full textA first example of a novel class of preorganized bimetallic complexes is reported, in which both an organometallic CpMn(CO)2 fragment and a classical Werner-type coordination site are arranged in close proximity by means of a bridging pyrazolate. The synthetic route starts from N-protected bis(chloromethyl)pyrazole and involves sequential attachment of the manganese part and the chelating N-donor compartment, bis(pyridylmethyl)amine, at the different sides of the ligand backbone. Pyrazole binding to the manganese(I) is achieved by photoinduced substitution of CO, and the adjacent N4-coordination pocket is suited to accommodate a second metal ion. The heterodinuclear MnZn complex 4 is characterized crystallographically and its redox chemistry investigated by spectroelectrochemical methods.publishe
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