Structure of bis(4-amino-1,2-dihydro-1-methyl-5-nitroso-2-oxo-6-pyrimidinolato-O,N)diaquazinc(II) dihydrate

4 páginas.Peer reviewe

Caffeine complexes of mercury(I): crystal structure of [Hg2(caffeine)2(NO3)2]

4 páginas, 2 figuras, 3 tablas.The crystal structure of Hg2(caffeine)2(NO3)2 has been determined by X-ray diffraction methods. It crystallizes in the monoclinic space group C2/c with a=26.969(4), b=5.273(1), c=16.956(4) Å, β= 100.89(1)°, V=2368.0(9) Å3, Z=4. The structure has been solved from diffractometer data by Patterson and Fourier methods and refined by full-matrix least-squares to R=0.028 for 2404 observed reflections. The crystal contains discrete [Hg2(caffeine)2]2+ ions in which ---Hg---Hg ions are linearly bonded to N9. The structure is stabilized by a number of contacts between mercury and nitrate oxygens.Peer reviewe

Adsorbentes de gases basado en polímeros de coordinación microporosos.

Fecha de presentación internacional:14.06.2006.- Titulates:Consejo Superior de Investigaciones Científicas (CSIC).- Universidad de Granada.- Universita Degli Studi Dell Insubria.- Università Degli Studi Di Milano[EN]The invention relates to gas adsorbents based on metal-organic microporous coordination polymers of the metallic bispyrmidinolate-type with a sodalite-type topology, having an adsorbent performance that is typical of crystalline microporous materials. The aforementioned materials also have a large accessible pore volume of between 25 and 45 % of the total volume of the material with a monodispersion of pores having diameters of less than 1.3 nm. In addition, the materials have a high capacity for adsorption of small gases, such as carbon monoxide, carbon dioxide, hydrogen, nitrogen, methane, acetylene, etc., which is reversible such that, once said gases have been stored, they can be desorbed.; Moreover, owing to the crystalline nature thereof, said materials are suitable for applications associated with the selective adsorption of small molecules such as for the safe storage of combustible gases and for the purification of gases with the elimination of trace impurities using dehydrated metal-organic porous compounds.[ES]Adsorbentes de gases basados en polímeros de coordinación microporosos metalorgánicos de tipo bispirimidinolato metálico de topología tipo sodalita, los cuales presentan un comportamiento como adsorbentes típico de materiales microporosos \O cristalinos. Presentan un gran volumen de poros accesible de entre un 25 y un 45% del volumen total del material con una moQ nodispersión de tamaño de poros con diámetros menores de 1.3 nm. Estos materiales presentan una gran capacidad de adsorción de gases de pequeño tamaño, tales como monóxido de carbono, dióxido de carbono, hidrógeno, nitrógeno, metano, acetileno, etc. M Dicha adsorción es reversible y, por tanto, una vez almacenados estos gases se pueden desorber. Al ser sistemas cristalinos, estos O materiales son adecuados para aplicaciones relacionadas con la adsorción selectiva de moléculas de pequeño tamaño como almacenaje seguro de gases combustibles y para la purificación de gases por eliminación de impurezas traza utilizando compuestos porosos metal orgánicos deshidratados.Peer reviewe