1,605 research outputs found
Coordination chemistry of 2-pyrimidinolate: Synthesis and characterization of a neutral tetrameric rhodium(I) derivative
No full textA novel metal-organic complex of analytical Rh(COD)(2-pymo) formulation (COD = 1,5-cyclooctadiene, 2-Hpymo = 2-hydroxypyrimidine) has been prepared by reacting [Rh(COD)Cl]2 with 2-Hpymo. While direct syntheses in a variety of solvents (acetone, toluene or methanol) typically afforded amorphous powders, recrystallization from methanol allowed to perform a single crystal data collection on the CH3OH solvate. The crystal structure of the latter [tetragonal, P-42c, a = 13.9780(2), c = 14.4980(10) Å, V = 2832.7(6) Å^3] contains cyclic [Rh(COD)(2-pymo)]4 tetramers, in which distorted square planar metal atoms are bridged by n1-μ2-N,N′-exo-bidentate 2-pymo ligands in 1,3-alternate disposition. Upon dissolving both the amorphous and the crystalline (solvated) species in CD2Cl2, variable temperature NMR spectra confirmed the presence of identical (tetrameric) species, thus excluding the existence of other oligomers of different nuclearity in the amorphous powders
SYNTHESIS, A. MASPERO, INCLUDING AN AB-INITIO XRPD STUDY OF CUDMNPZ HDMNPZ, -DIMETHYL--NITRO PIRAZOLE.
No full textThe history of the Romano famili and "Angelo, tyran de Padoue" by Victor Hugo.
No full textreservedVictor Hugo, nel dramma Angelo, tyran de Padue, ricama tre diverse epoche storiche: i primi decenni dell’Ottocento, a lui contemporanei; la metà del Cinquecento, prescelta per lo svolgimento dell’azione drammatica; il tardo Medioevo evinto dai personaggi principali che compongono il racconto. Tuttavia, l’interesse storico e prettamente romantico verso il periodo medievale assume in quest’opera una rilevanza primaria. Tra le tante casate del nord Italia nominate dall’autore nell’opera, una su tutte sembra essere davvero simbolica. Particolarmente interessante è stato comprendere come la storia della famiglia da Romano costituisca il fulcro della costruzione drammaturgica. Ezzelino III e Cunizza da Romano sono elevati a emblema della poetica romantica e divengono funzionali al messaggio politico e sociale dell’autore.Victor Hugo, in his play Angelo, tyran de Padue, embroiders three different historical epochs: the first decades of the 19th century, contemporary with him; the middle of the 16th century, chosen for the unfolding of the dramatic action; and the late Middle Ages evoked by the main characters in the story. However, the historical and purely romantic interest in the medieval period takes on primary importance in this work. Of the many northern Italian lineages named by the author in the work, one in particular seems to be truly symbolic. It was particularly interesting to understand how the history of the da Romano family forms the core of the dramaturgical construction. Ezzelino III and Cunizza da Romano are elevated to emblems of romantic poetics and become functional to the author's political and social message
Elucidating the CO2 adsorption mechanisms in the triangular channels of the bis(pyrazolate) MOF Fe2(BPEB)3 by in situ synchrotron X-ray diffraction and molecular dynamics simulations
No full textThe structural origin of the remarkable performance of the metal–organic framework Fe2(BPEB)3 as a CO2 adsorbent (40.5% of the host weight at 298 K and 10 bar) was investigated by combining advanced experimental and computational tools.</p
Michael Angelo Caruso, international author, consultant, and speaker on Campus
No full textTollefson, Elizabeth. (2013). Michael Angelo Caruso, international author, consultant, and speaker on Campus. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/223386
Synthesis, structure and thermal behaviour of two magnesium complexescontaining the 1,4-bis(5-tetrazolyl)benzene ligand
No full textSynthesis of alkaline-earth hexaborides, MB6 (M = Ca, Ba, Sr), by a solid state metathesis (SSM) reaction
No full textA new synthetic pathway for alkaline-earth hexaborides has been developed. This method involves a solid state metathesis between an alkaline-earth (Ca, Ba, Sr) salt and MgB2, which can be performed at relatively low temperatures, without any catalyst and with no hazardous side products. The proposed protocol shows a good reproducibility and a much lower energy consumption (and, consequently, lower costs) than any known traditional synthesis. In view of the possibility of using alkaline-earth hexaborides as overdopants in MgB2 superconductors in order to enhance its transport properties in magnetic field, several MgB2 + MB6 bulk composites were obtained with the “Reactive Liquid Mg Infiltration” (Mg-RLI) technique, and characterized by X-ray Powder Diffraction (XRPD) and Scanning Electron Microscopy (SEM) methods
Cu(II) bifunctional (N,O,Oâ2) coordination polymer: A case study for complex ab-initio crystal structure determination from PXRD data
No full textThe synthesis of a novel Cu(II) bifunctional (N,O,Oâ2) coordination polymer, the Cu(PzHP) compound, has been carried out by coupling Cu(II) salts and the newely synthesized H2(PzHP) organic linker (H2(PzHP) = 1-[4-(1H) -pyrazolyl]-2-methyl-3-hydroxy-4(1H)-pyridinone). Despite to the numerous attempts done for the growth of suitable single crystals and to the synthetic trials carried out to ameliorate the crystallinity of the Cu(PzHP) coordination polymer, its diffraction pattern was always characterized by a discouraging, less-than-ideal, crystallinity. Notwithstanding the extended disorder, leading to a higher than required space group symmetry, we succeeded in the description of its relevant structural features by following an unconventional route to ab-initio structure solution. In this process consideration on the coordination ability of the ligand and on the space group symmetry have been taken into account to âmanuallyâ achieve the initial structural model, highlighting that, in some cases, it is still possible to ascertain by PXRD the crystal structure of a material that shows challenging, broad, PXRD pattern
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