Covalent assembly of a two-dimensional molecular ‘‘sponge’’ on a Cu(111) surface:Confined electronic surface states in open and closed pores

We present a new class of on-surface covalent reactions, formed between diborylene-3,4,9,10-tetraaminoperylene and trimesic acid on Cu(111), which gives rise to a porous 2D-'sponge'. This aperiodic network allowed the investigation of the dependence of electron confinement effects upon pore size, shape and even in partial confinement

La importancia de la personalidad del traductor en los itinerarios de especialidad y en la selección de personal

Treball Final de Grau en Traducció i Interpretació. Codi: TI0983. Curs acadèmic: 2016/2017A pesar de que a simple vista no lo pueda parecer, la personalidad de los traductores influye mucho más de lo que se cree en el proceso traductor y en la toma de decisiones, como han puesto de manifiesto estudios empíricos. Para analizar cuáles son las diferencias individuales en la personalidad de los traductores en la elección del itinerario de especialidad, se ha llevado a cabo un estudio con los estudiantes de los cuatro itinerarios de traducción de la Universidad Jaume I, a fin de ver si podemos identificar los rasgos típicos de los estudiantes de cada itinerario. Además, dada la gran importancia de la personalidad en las tareas de traducción, también se ha entrevistado a responsables de tres agencias de traducción para ver si la personalidad de los traductores es un factor relevante a la hora de reclutar personal. Se ha comprobado así que sí hay algunos rasgos comunes en la personalidad de los estudiantes de cada itinerario y que realmente esta cuestión no es un factor relevante en las agencias de traducción, sino que se valora, sobre todo, el trabajo diario y la calidad de las pruebas de traducción

Structures and bonding of homoleptic bis(2,3-dihydro-1,3-diborole) complexes of nickel and platinum

Homoleptic metal complexes of the boron heterocycle 2,3-dihydro-1,3-diborole {(R1C)2(R2B)2R3(H)C} 1 are described. X-Ray crystal structure determinations of two nickel and platinum derivatives are presented. In the nickel complex [Ni(1d)2] 6d (R1 = R2 = R3 = Et) the essentially coplanar heterocycles attain a pentahapto coordination mode with a gauche orientation with respect to one another. An 18 VE count is attained. In contrast, in the 14 VE platinum complex [Pt(1a)2] 4a (R1 = R2 = Et, R3 = Me) the ligands are strongly folded and adopt a tetrahapto coordination. The molecule is centrosymmetric in the crystalline state. DFT MO calculations are presented to establish the relative stabilities of these coordination modes for nickel and platinum, respectively

Bis(imino)pyrazine-Supported Iron Complexes: Ligand-Based Redox Chemistry, Dearomatization, and Reversible C-C Bond Formation

Iron complexes supported by novel pi-acidic bis-(imino)pyrazine ((PDI)-D-Pz) ligands can be functionalized at the nonligated nitrogen atom, and this has a marked effect on the redox properties of the resulting complexes. Dearomatization is observed in the presence of cobaltocene, which reversibly reduces the pyrazine core and not the imine functionality, as observed in the case of the pyridinediimine-ligated iron analogues. The resulting ligand-based radical is prone to dimerization through the formation of a long carbon-carbon bond, which can be subsequently cleaved under mild oxidative conditions

Azaphilic versus Carbophilic Coupling at C=N Bonds: Key Steps in Titanium-Assisted Multicomponent Reactions

International audienceConsecutive C- and N-arylation of N-heterocyclic nitriles is mediated by titanium(IV) alkoxides. The carbo- and azaphilic arylation step may be separated by choosing the order in which the two equivalents of aryl transfer reagent are added. In the course of this transformation, the ancillary N-heterocycle acts as both a directing anchor group and electron reservoir. In the selectivity-determining step, the selectivity is governed by a choice between (direct) C- and Ti-arylation; the latter opens up a reaction pathway that allows further migration to the nitrogen atom. The isolation of metal-containing aggregates from the reaction mixture and computational studies gave insights into the reaction mechanism. Subsequently, a multicomponent one-pot protocol was devised to rapidly access complex quaternary carbon centers

η⁶-Arene-Zirconium-PNP-Pincer Complexes: Mechanism of Their Hydrogenolytic Formation and Their Reactivity as Zirconium(II) Synthons

International audienc

DYNAMICS AND MOLECULAR AGGREGATION IN CRYSTALLINE [(M(C5H5))(3)(MU(3)-ETA(2)ETA(2)ETA(2)-C(6)H(5)R)] [M=CO, R=CH(PH)ME, CH(2)CH(2)PH OR CHCHME, M=RH, R=H] CLUSTERS

The intermolecular aggregation in crystalline arene clusters of the type [{M(C5H5)}(3)(mu(3)-eta 2:eta(2):eta(2)-C(6)H(5)R)] [M = Co, R = CH(Ph)Me, CH(2)CH(2)Ph or CHCHMe; M = Rh, R = H] has been investigated by atom-atom packing potential-energy calculations and computer graphics. The ease of reorientation of the arene fragments and of the cyclopentadienyl ligands in the solid state has been investigated by calculating intramolecular and intermolecular potential-energy barriers. It has been shown that, except for the benzene ligand in [{Rh(C5H5)}(3)(mu(3) eta-(2):eta(2):eta(2)-C6H6)], the facial arenes cannot undergo reorientation in the solid state, whereas the reorientational motion of the cyclopentadienyl ligands is under intramolecular control

High tacticity control in organolanthanide polymerization catalysis: formation of isotactic poly(alpha-alkenes) with a chiral C-3-symmetric thulium complex

The thulium complexes [Tm(iPr-trisox)(CH2SiMe2R)3] (R = Me 1a, Ph 1b) were synthesized from the thulium trialkyl precursors [Tm(CH2SiMe2R)3(thf)2]; reaction of 1a with two equivalents of [Ph3C][B(C6F5)4] gave a cationic complex 1c, which was found to polymerize 1-hexene, 1-heptene and 1-octene to give the corresponding polyolefins with moderate to good activities and with minimum isotacticity of 90%, 83% and 95%, respectively