1,721,170 research outputs found
Tracing iodine
No full textPierangelo Metrangolo and Giuseppe Resnati celebrate the bicentenary of the discovery of iodine — a good time to also bring to its conclusion an international project that aims to define and categorize halogen bonding
ORGANOMETALLIC FRAMEWORKS IN SUPRAMOLECULAR POLYMERS
No full textOrganometallic frameworks are useful modules in supramolecular systems creation [1]. In this respect, they can impart particular structural and electronic properties, simply by varying the ligands on the metal centre. In particular, using bifunctional ligands, it is possible to achieve infinite chains or designed supramolecular systems through the occurrence of non-covalent interactions such as hydrogen bond, halogen bond, electrostatic interaction, π-π interaction, etc. Here we report the preparation of some adducts we recently obtained on co-crystallization of trans-[PtL2(C≡C-4-py)2] (L = PCy3, PEt3) with 1,2-diiodoperfluoroethane, 1,4-diiodoperfluorobenzene and 4,4’-diiodo-2,2’,3,3’-octafluoro-trans-stilbene [2]. The halogen bond between the modules is confirmed by the X-ray structures, showing that both the organoplatinum derivative and the diiodofluorocarbons behave as bidentate and telechelic modules
Templated out\u2010of\u2010equilibrium self\u2010assembly of branched Au nanoshells (Small 12/2023)
No full textAbstract: Out-of-equilibrium self-assembly of metal nanoparticles achieving 3D structures with controlled morphology is still rare. In article number 2206712, Claudia Pigliacelli, Pierangelo Metrangolo, and co-workers adopt a peptide-gold superstructure as template to control the out-of-equilibrium self-assembly of Au nanoparticles, obtaining a transient 3D branched Au-nanoshell stabilized by surfactant. The nanoshell dismantles upon concentration gradient equilibration, leading to disassembly and regression to the template
Accessing Unexplored Supramolecular Trajectories through Mechanochemistry
Full text link[Formula presented]Luca Catalano received his Bachelor's in Chemistry from the University of Milan (2011) and his MS in Photochemistry and Molecular Materials from the University of Bologna, working with Professor Dario Braga (2013). He then earned his PhD in supramolecular chemistry from the Polytechnic University of Milan under the supervision of Professor Pierangelo Metrangolo (2017). After a first postdoctoral appointment at New York University Abu Dhabi, working with Professor Panče Naumov on molecular crystalline materials, he joined the lab of Professor Andy Cooper at the University of Liverpool, where he is currently Postdoctoral Research Associate working on porous liquids and crystals
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
Variations on the Author
Full text link“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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