1,727,910 research outputs found
XAFS spectrum of Silver(I) fluoride
No full textThis dataset consists of X-ray absorption fine structure (XAFS) spectra at Ag L3-edge of Silver(I) fluoride measured at PF, and is a part of XAFS database (MDR XAFS DB, https://doi.org/10.48505/nims.1447) as a collection of MD
XAFS spectrum of Silver(I) oxide
No full textThis dataset consists of X-ray absorption fine structure (XAFS) spectra at Ag K-edge of Silver(I) oxide measured at SPring-8, and is a part of XAFS database (MDR XAFS DB, https://doi.org/10.48505/nims.1447) as a collection of MD
XAFS spectrum of Silver(I) sulfate
No full textThis dataset consists of X-ray absorption fine structure (XAFS) spectra at Ag L3-edge of Silver(I) sulfate measured at PF, and is a part of XAFS database (MDR XAFS DB, https://doi.org/10.48505/nims.1447) as a collection of MD
N,N’-bis(2-(benzylthio)ethyl)malonamides: Synthesis, Electronic and Steric effects in Silver(I) Extraction and Silver(I) Binding Studies
No full textUnsubstituted and
gem-diethyl substituted malonamide derivatives, bearing benzylthio arms were
prepared in moderate to high yields at room temperature. It was observed that
electronics effects at the 4-aryl position in the malonamide derivatives had a
significant effect on the selectivity, but little effect on silver(I)
extraction efficiency measured by liquid-liquid extraction experiments (with
the 4-methoxy analogue proving the most selective). Increased steric hindrance
near the sulfur donor had a small negative effect on silver(I) extraction
efficiency, while hindrance at the methylene centre reduces selectivity. One of
the malonamide derivatives prepared was found to bind to silver(I) in a 1:1
fashion suggesting a tetrahedral coordination type
Investigating silver coordination to mixed chalcogen ligands
No full textThe work in this project was supported by the Engineering and Physical Sciences Research Council (EPSRC).Six silver(I) coordination complexes have been prepared and structurally characterised. Mixed chalcogen-donor acenaphthene ligands L1–L3 [Acenap(EPh)(E'Ph)] (Acenap = acenaphthene-5,6-diyl; E/E' = S, Se, Te) were independently treated with silver(I) salts (AgBF4/AgOTf). In order to keep the number of variables to a minimum, all reactions were carried out using a 1:1 ratio of Ag/L and run in dichloromethane. The nature of the donor atoms, the coordinating ability of the respective counter-anion and the type of solvent used in recrystallisation, all affect the structural architecture of the final silver(I) complex, generating monomeric, silver(I) complexes {[AgBF4(L)2] (1 L = L1; 2 L = L2; 3 L = L3), [AgOTf(L)3] (4 L = L1; 5 L = L3), [AgBF4(L)3] (2a L = L1; 3a L = L3)} and a 1D polymeric chain {[AgOTf(L3)]n 6}. The organic acenaphthene ligands L1-L3 adopt a number of ligation modes (bis-monodentate μ2-η2-bridging, quasi-chelating combining monodentate and η6-E(phenyl)-Ag(I) and classical monodentate coordination) with the central silver atom at the centre of a tetrahedral or trigonal planar coordination geometry in each case. The importance of weak interactions in the formation of metal-organic structures is also highlighted by the number of short non-covalent contacts present within each complex.Peer reviewe
Cooperativity between the Silver(I) and Iodine(III) Centers in Electrophilic Activation of Organic Substrates
No full textKinetic data and computational study indicate that in the solution, pyrazole-containing iodolium salts and silver(I) center bind each other, and such interplay significantly affect the total catalytic activity of mixture of these Lewis acids compared with separate catalysis of the reactions required electrophilic activation of carbonyl, imino group, or triple CC bond. Moreover, the kinetic data and 1H NMR monitoring indicate that such cooperation results in prevention of decomposition of the organocatalysts by the silver(I) center during the reaction progress. XRD study indicates that in the solid state, the iodolium triflates and silver(I) triflate associate each other to give the complex species featuring triflate-bridged iodine(III) and silver(I) centers: a rare example of square-planar silver(I) complex and pentacoordinated trigonal bipyramidal dinuclear silver(I) complex
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Silver(I) dithiocarboxylate complexes - clustering and aggregation
No full textGrote J, Neumann B, Stammler H-G, Mitzel NW. Silver(I) dithiocarboxylate complexes - clustering and aggregation. DALTON TRANSACTIONS. 2018;47(17):6036-6040.The neutral silver(I) dithiocarboxylate complexes silver(I) dithioacetate, silver(I) pentafluorodithiobenzoate, silver(I) 2,4,6-trimethyldithiobenzoate, silver(I) 2,4,6-tri-iso-propyldithiobenzoate and silver(I) 2,6-dimesityldithiobenzoate were synthesized and characterized by IR spectroscopy, elemental analyses and single crystal X-ray diffraction. All complexes form primarily dinuclear units with eight-membered rings [Ag2S4C2], which in turn aggregate by argentophilic interactions and additional Ag...S contacts in their crystal structures. The molecular structures and shapes of aggregation in the solid state are presented and discussed. The layer-like and chain-like aggregates as well as the [Ag] clusters formed are compared with the (almost) analogous gold(I) complexes
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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