Search results for "etica."
showing 10 items of 13546 documents
Noncovalent axial I∙∙∙Pt∙∙∙I interactions in platinum(II) complexes strengthen in the excited state
2021
Abstract Coordination compounds of platinum(II) participate in various noncovalent axial interactions involving metal center. Weakly bound axial ligands can be electrophilic or nucleophilic; however, interactions with nucleophiles are compromised by electron density clashing. Consequently, simultaneous axial interaction of platinum(II) with two nucleophilic ligands is almost unprecedented. Herein, we report structural and computational study of a platinum(II) complex possessing such intramolecular noncovalent I⋅⋅⋅Pt⋅⋅⋅I interactions. Structural analysis indicates that the two iodine atoms approach the platinum(II) center in a “side‐on” fashion and act as nucleophilic ligands. According to c…
A New Pt(II) Complex with Anionic s-Triazine Based NNO-Donor Ligand: Synthesis, X-ray Structure, Hirshfeld Analysis and DFT Studies
2022
The reaction of PtCl2 with s-triazine-type ligand (HTriaz) (1:1) in acetone under heating afforded a new [Pt(Triaz)Cl] complex. Single-crystal X-ray diffraction analysis showed that the ligand (HTriaz) is an NNO tridentate chelate via two N-atoms from the s-triazine and hydrazone moieties and one oxygen from the deprotonated phenolic OH. The coordination environment of the Pt(II) is completed by one Cl−1 ion trans to the Pt-N(hydrazone). Hirshfeld surface analysis showed that the most dominant interactions are the H···H, H···C and O···H intermolecular contacts. These interactions contributed by 60.9, 11.2 and 8.3% from the…
Universalismo etico e differenza religiosa
2002
Almudena Guzmán. Come onde. Antologia poetica
2020
All’interno dell’attuale panorama letterario spagnolo, la poesia di Almudena Guzmán ha saputo conquistarsi, dagli anni Ottanta ad oggi, un ampio consenso da parte della critica e del pubblico di lettori, ritagliandosi uno spazio inedito e originale, unico nel suo genere. Redattrice, autrice di articoli di opinione, critica letteraria e teatrale e per lungo tempo collaboratrice del supplemento culturale del quotidiano ABC, la poetessa si è distinta anche come filologa e giornalista per la Fundéu BBVA (Fundación del Español Urgente) e come sceneggiatrice di programmi radiofonici e televisivi. Di recente, inoltre, ha gestito laboratori di scrittura creativa presso l’Instituto Cervantes di Madr…
Politica energetica e sviluppo locale:esperienze in Sicilia
2014
La questione energetica è diventata di centrale importanza nelle politiche regionali di sviluppo locale. La Sicilia nei prossimi anni avrà a disposizione da parte dell’Unione Europea circa 30 milioni di euro per finanziare interventi relativi al risparmio energetico. Il decreto relativo ai Piani di Azione di Energia Sostenibile destinato agli enti locali consentirà ai 390 comuni aderenti al Patto dei Sindaci di iscrivere a bilancio questi fondi fuori dal Patto di Stabilità. I comuni diventano gli attori chiave del processo di riqualificazione energetico-ambientale del territorio siciliano e di rilancio dell’economia locale. L’analisi descrive alcune esperienze recenti nei comuni siciliani, …
Seneca. La clemenza
2017
Nell'impianto argomentativo e dialettico del De clementia il princeps senecano si autorealizza, con esplicito riferimento alla teoria platonica, nell'euboulia, la capacità di prendere giuste decisioni politiche (Prot. 318e), nella phronesis (resp. 433b-d) e nell'episteme philakike (resp. 428a), la scienza della difesa e protezione della città. Si tratta di virtù che rendono l'uomo degno di esercitare il potere politico e hanno come fine il bene e l'utile di tutti i sudditi e sulle quali si incentra, nell'opera, il messaggio parentetico del filosofo all'alunno Nerone.
Compatibilization of Polylactide/Poly(ethylene 2,5-furanoate) (PLA/PEF) Blends for Sustainable and Bioderived Packaging.
2022
Despite the advantages of polylactide (PLA), its inadequate UV-shielding and gas-barrier properties undermine its wide application as a flexible packaging film for perishable items. These issues are addressed in this work by investigating the properties of melt-mixed, fully bioderived blends of polylactide (PLA) and poly(ethylene furanoate) (PEF), as a function of the PEF weight fraction (1–30 wt %) and the amount of the commercial compatibilizer/chain extender Joncryl ADR 4468 (J, 0.25–1 phr). J mitigates the immiscibility of the two polymer phases by decreasing and homogenizing the PEF domain size; for the blend containing 10 wt % of PEF, the PEF domain size drops from 0.67 &p…
Naturally Occurring Oxazole Structural Units as Ligands of Vanadium Catalysts for Ethylene-Norbornene (Co)polymerization
2021
1,3-Oxazole and 4,5-dihydro-1,3-oxazole are common structural motifs in naturally occurring peptides. A series of vanadium complexes were synthesized using VCl3(THF)3 and methyl substituted (4,5-dihydro-1,3-oxazol-2-yl)-1,3-oxazoles as ligands and analyzed using NMR and MS methods. The complexes were found to be active catalysts both in ethylene polymerization and ethylene-norbornene copolymerization. The position of methyl substituent in the ligand has considerable impact on the performance of (co)polymerization reaction, as well as on the microstructure, and thus physical properties of the obtained copolymers.
Titanium and Vanadium Catalysts with 2-Hydroxyphenyloxazoline and Oxazine Ligands for Ethylene-Norbornene (co)Polymerization
2019
A series of titanium and vanadium complexes with oxazoline 2-(4,5-dihydro-1,3-oxazol-2-yl)phenol (L1), 2-(4-methyl-4,5-dihydro-1,3-oxazol-2-yl)phenol (L2), and oxazine 2-(5,6-dihydro-4H-1,3-oxazin-2-yl)phenol (L3) ligands were synthesized, and their structures were determined by NMR and MS methods as (L)2MtCl2. The vanadium complexes were found to be highly active in ethylene (7300 kgPE/(molV·
The role of the matrix-filler affinity on morphology and properties of polyethylene/clay and polyethylene/ compatibilizer/clay nanocomposites drawn f…
2009
In this work the structural variations and mechanical performance of polyethylene/clay nanocomposite drawn fibres, also in the presence ofcompatibilizer, such as a commercial maleic anhydride grafted polyethylene, PEgMA, was studied. In the isotropic state both systems show intercalated morphology.After spinning and cold drawing, by adding the nanoparticles, the tensile strength as a function of the draw ratio increases and this rise is more pronounced for the filled compatibilized system. The reduction of the elongation at break, on the contrary, is about the same for all the examined samples. The orientation of the macromolecules, evaluated by measurements of the birefringence and calorim…