Results 11 to 20 of about 63,120,713 (162)

A Molecular Hybrid 2D/3D Carbon Allotrope: Synthesis of Adamanphene

ChemistryEurope
A new molecular nanographene, adamanphene, has been designed and synthesized by integrating an adamantane core with four peripheral hexa‐peri‐hexabenzocoronene (HBC) units, thus combining structural motifs reminiscent of two carbon allotropes, diamond ...
Marina Iglesias‐Rabadán, Josefina Perles, Jesús Manuel Fernández‐García, Nazario Martín   +3 more
doaj   +2 more sources

Estudio cinético in situ de la fase limonita por difracción de rayos X y espectroscopia u-Raman [PDF]

Revista de Investigación de Física, 2010
Se realiza un estudio cinético de la fase limonita, FeO(OH)-nH2O, a través de la difracción de rayos X y la espectroscopia u-Raman. El oxido en polvo fue extraído en el distrito de Taraco, provincia de Huancané en la región de Puno de Perú. La difracción
P. R. Palacios, A. G. Bustamante, J. C. González   +2 more
doaj   +2 more sources

Electronic Control of the Scholl Reaction: Selective Synthesis of Spiro vs Helical Nanographenes. [PDF]

Angew Chem Int Ed Engl, 2023
The electronic nature of the starting substrate decides the fate of the reaction: Anthracene‐based polyphenylenes lead to less‐known spiro (R=H) or helical (R=F) nanographenes under mild Scholl conditions, depending upon the substitution pattern on the anthracene core.
Izquierdo-García P, Fernández-García JM, Perles J, Fernández I, Martín N.   +4 more
europepmc   +3 more sources

Nanographene-Based van der Waals Organic Framework With Permanent Porosity. [PDF]

Angew Chem Int Ed Engl
Unlocking record‐breaking porosity in a supramolecular organic framework (SOF). Through the strategic design of a C3‐symmetric nanographene, a robust supramolecular framework is achieved via exclusively weak van der Waals forces. This metal‐free scaffold reaches a benchmark BET surface area of 1108 m2 g−1 –the highest to date for this class–combining ...
Oró A, Turo-Cortés R, Perles J, Costa JS, Fernández-García JM, Martín N.   +5 more
europepmc   +3 more sources

Torsion Effects Beyond the δ Bond and the Role of π Metal-Ligand Interactions. [PDF]

Adv Sci (Weinh)
Recent research challenges established notions in bimetallic paddlewheel compounds. Contrary to prior findings, higher torsion results in shorter metal–metal distances, not longer. This anomaly, attributed to overlooked π metal‐ligand interactions, highlights the importance of the π conjugated nature of the equatorial ligands in the electronic ...
Inchausti A, Mollfulleda R, Swart M, Perles J, Herrero S, Baonza VG, Taravillo M, Lobato Á.   +7 more
europepmc   +2 more sources

Tetrahedraphene: A Csp3‐centered 3D Molecular Nanographene Showing Aggregation‐Induced Emission

Angewandte Chemie, Volume 135, Issue 49, December 4, 2023., 2023
Supramolecular interactions in the solid state (X‐ray) and solution (mixtures of THF/H2O) control the photophysical properties! A singular 3D nanographene (Tetrahedraphene) shows a remarkable aggregation‐induced emission upon water addition changing from blue in solution to vivid yellow colour in the precipitated solid.
Arturo Oró, Fernando Romeo‐Gella, Josefina Perles, Jesús M. Fernández‐García, Inés Corral, Nazario Martín   +5 more
wiley   +2 more sources

Sistema automático para determinar estructuras cristalinas por difracción de rayos-X [PDF]

, 1978
Se desarrolla en este trabajo un sistema de calculo para la determinación de estructuras cristalinas por difracción de rayos-X. Las caracteristicas de este sistema son: Incorporar los métodos y las técnicas más recientes.
Solans, Xavier, 1949-2007, Miravitlles Torras, Carles   +1 more
core   +7 more sources

Reconstructing formation processes at the Canary Islands indigenous site of Belmaco Cave (La Palma, Spain) through a multiproxy geoarchaeological approach

Geoarchaeology, Volume 38, Issue 6, Page 713-739, November/December 2023., 2023
Abstract The indigenous populations of La Palma (Canary Islands), who arrived on the island from Northwest Africa ca. 2000 years B.P., were predominantly pastoralists. Yet, many aspects of their subsistence economy such as the procurement, management, and use of wild plant resources remain largely unknown.
Enrique Fernández‐Palacios, Margarita Jambrina‐Enríquez, Susan M. Mentzer, Caterina Rodríguez de Vera, Ada Dinckal, Natalia Égüez, Antonio V. Herrera‐Herrera, Juan Francisco Navarro Mederos, Efraín Marrero Salas, Christopher E. Miller, Carolina Mallol   +10 more
wiley   +1 more source

X-Ray Computed Tomography. [PDF]

, 2023
En esta ponencia se presenta una breve introducción a la técnica: Tomografía Computerizada de Rayos-X. Además, se presenta el tomógrafo ubicado en la Unidad de Difracción de Rayos-X y Tomografía Computerizada de los Servicios Centrales de Apoyo a la ...
León-Reina, Laura, Quintero Martos, Estefanía, Salcedo, Inés R.   +2 more
core  

Importancia de la difracción de rayos X en la Química

Educación Química, 2018
En 1992, se cumplieron 80 años del descubrimiento de la difracción de rayos X...
María A. Castellanos Román
doaj   +1 more source