Santiago Montero Herrero

First microwave synthesis of multiple metal-metal bond paddlewheel compounds

A green and efficient microwave assisted synthesis of elusive tetrakis(diaryltriazenido)diruthenium(II) complexes was carried out under microwave irradiation. It is a simple, clean, and fast method that proceeds with good yield, in contrast with the poor ones reported in previous syntheses.

Both end-on and end-to-end azide bridged tetranuclear ferromagnetic nickel(II) Schiff base complexes

Variable temperature magnetic measurements of a novel tetranuclear nickel(II) complex, consisting of two pseudo-dinuclear entities bridged by an end-to-end azide, indicate the presence of both intra- and inter-dinuclear ferromagnetic interactions (J1 = 16.48 cm−1 and J2 = 24.17 cm−1, respectively), as also corroborated by DFT calculations (J1 = 12.0 cm−1 and J2 = 29.2 cm−1).

Un oráculo del Apolo de Claros en Galicia

En 1973 fue hallada en la ermita de Santa Eulalia de Portorroibo (Pontes de Garcia Rodriguez, A Coruna) un ara votiva de granito; se trata de un bloque de proporciones relativamente grandes (142 >< 47 X 30 cm.) que conserva la base y la cornisa solamente en la cara posterior, en tanto a los lados y delante la superficie ha quedado lisa. Contiene una inscripcion de buena calidad (lit. 9-8 cm.), pero cuyas dos ultimas lineas son dificiles de leer. La lectura ofrecida por Rivera Rouco’ es la siguiente:

A mixed phenoxo and end-on azide bridged dinuclear copper(II) Schiff base complex: synthesis, structure, magnetic characterization and DFT study

A dinuclear copper(II) complex, [(H2O)Cu(L)(μ1,1-N3)Cu(L)]ClO4 [HL = (2-(2-(ethylamino)ethylimino)methyl)-6-ethoxyphenol] has been synthesized and characterized by spectral and elemental analyses. The structure has been confirmed by single crystal X-ray diffraction. Variable temperature (2–300 K) magnetic susceptibility measurements indicate the presence of antiferromagnetic exchange coupling between the copper(II) centers (J = −46.18 cm−1), as also corroborated by DFT calculations (Jtheo = −45.98 cm−1). The calculated spin densities at the copper(II) centers were +0.56 and −0.61, confirming that they are the magnetic centers. An experimental absorption spectrum of the complex has been compared with a normalized absorption spectrum obtained theoretically. Supramolecular interactions in the solid state of the complex have also been characterized with the help of Hirshfeld analysis and the AIM theory.

Octaviano y el prodigio de Munda

El prodigio de Munda (45 a.C.), la palmera que una vez cortada se regeneraba con mayor vigor superando el retono en altura al tronco-madre talado y en la que nidifican palomas, es conocido a traves de Suetonio y Dion Casio. Se analiza en la presente contribucion las diferentes propuestas de interpretacion y se propone el significado del arbol como simbolo de continuidad dinastica y el de las palomas como expresion de la descendencia, por parte de los Julio-Claudios, de la diosa Venus.

Crystal structure of poly[[trans-di-aqua-bis-[μ2-trans-4,4'-(diazenedi-yl)dipyridine]-nickel(II)] diiodide ethanol disolvate].

In the title compound, {[Ni(C10H8N4)2(H2O)2]I2·2C2H5OH}n, the complex shows an octahedral environment of the Ni2+ cation in which it is located on a centre of symmetry, linked to two water molecules and the pyridine-N atoms of four 4,4′-(diazenediyl)dipyridine ligands bridging Ni2+ cations along the b- and c-axis directions, giving rise to a two-dimensional arrangement. The Ni—N bond lengths are in the range 2.109 (4)–2.186 (3) Å and the Ni—O bond length is 2.080 (3) Å. The 4,4′-(diazenediyl)dipyridine ligand lies on an inversion centre. An O—H⋯O hydrogen-bond interaction is observed between water and ethanol molecules. The I− ions can be regarded as free anions in the crystal lattice.

Mario, las aves y el ejército

C. Mario adopto durante su tercer consulado el aguila como emblema de las legiones romanas. Un analisis de las fuentes pone de manifiesto la estrecha vinculacion del celebre militar y politico con las aves, especialmente a traves de la mediacion aruspicinal. Marius adopted during his third consulate the eagle as badge of the roman Legions . An analysis of his sources shows the narrow vinculation between the famous soldier and politic witch the birds , specially through the auruspicined mediation.

Neoplatonismo y haruspícina: historia de un enfrentamiento

A lo largo de su obra, Platon afirmo la superioridad de la adivinacion intuitiva o natural (dtheknos, adidaktos) sobre la adivinacion de caracter inductivo o artificial (entekhnos, technike) La primera consiste en una especie de locura (mania) o de extasis que invade a los profetas y profetisas tales como las sibilas, las pitias o los bakides, a quienes el filosofo griego considera directamente inspirados por la divinidad sin mediacion de ningun signo sensible esta forma de adivinacion que se obtiene por el enthysiasmos, es decir, por la presencia del dios en el alma del profeta, es una actividad sobrenatural tanto en sus principios como en su modo y efectos. Platon senala que los hombres que la practican “han hecho a la Helade, privada y publicamente, muchos hermosos beneficios” 2 La adivinacion inductiva o artificial se basa, por el contrario, en la obser-