Single-crystal-to-single-crystal transformation and catalytic properties of new hybrid perhalidometallates

Two new organic–inorganic salts of perhalidometallates with protonated organic amine cations have been synthesized and characterized by X-ray diffraction and thermal analysis. (CHBMAH2) ZnBr4·3/2H2O 1 and (CHBMAH2 )ZnCl4 4 [(CHBMAH2 )2+: 1, 3-cyclohexanebis(methylammonium)] were obtained in single-crystal form. The crystal packing in all of the obtained compounds is governed by the formation of various non-covalent intermolecular forces between tetrahalidometallate anions and organic cations, assisted by water molecules in the hydrates. Hirshfeld surface analysis denotes that the most important contributions to the crystal packing are X···H/H···X (X: Cl, Br, I) and H···H interactions. Interestingly, the compound 1, 3-cyclohexanebis(methylammonium)tetrachlorido-zincate (II) dihydrate, (CHBMAH2 )ZnCl4·2H2O 2, undergoes thermally-triggered single-crystal-to-single-crystal (SCSC) transformation upon dehydration to produce a supramolecular solid compound, 1, 3-cyclohexanebis(methylammonium) tetrachloridozincate (II), (CHBMAH2 )ZnCl4 4. The SCSC transformation causes changes in the lattice parameters and a structural rearrangement. Furthermore, the catalytic properties of (CHBMAH2 )ZnCl4·2H2O 2 and (CHBMAH2 )CdI4·2H2O 3 have been explored in the acetalization process using various uncommon alcohols, beyond methanol or ethanol, for the first time in the literature, with outstanding results, and opening the door to the formation of alternative acetals. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

INTRABEAM: precision hypo-fractionated radiotherapy with a systemic immune response

Purpose or Objective: To evaluate the changes in immune-cell phenotype in peripheral blood following intraoperative radiotherapy (IORT) in breast cancer patients

El yacimiento kárstico del Pleistoceno Superior de la Cueva del Camino en el Calvero de la Higuera (Pinilla del Valle, Madrid)

Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEpu

Nuclear organization and 3D chromatin architecture in cognition and neuropsychiatric disorders

The current view of neuroplasticity depicts the changes in the strength and number of synaptic connections as the main physical substrate for behavioral adaptation to new experiences in a changing environment. Although transcriptional regulation is known to play a role in these synaptic changes, the specific contribution of activity-induced changes to both the structure of the nucleus and the organization of the genome remains insufficiently characterized. Increasing evidence indicates that plasticity-related genes may work in coordination and share architectural and transcriptional machinery within discrete genomic foci. Here we review the molecular and cellular mechanisms through which neuronal nuclei structurally adapt to stimuli and discuss how the perturbation of these mechanisms can trigger behavioral malfunction

Le système d'information géographique : un outil d'aide à la décision pour la gestion de l'espace

In this article, the following topics are successively covered: the GIS borne of the ever increasing use of geographic information and technical advances; the GIS concept; the general principles and functions; the description methods for a spatial analysis; an example of use; the definition of a sensitivity area in the Landes massif. / Cette intervention aborde successivement : les SIG nés de l'utilisation croissante de l'information géographique et de l'évolution des techniques ; le concept de SIG ; les fonctions et principes généraux ; les modes de description pour une analyse spatiale ; un exemple d'utilisation : élaboration d'un zonage de sensibilité dans le Massif Landais

Coût de production du maïs-grain irrigué sur sols sableux forestiers en Gironde et Landes récolte 1988

The observation and analysis of the actual financial results of 24 farms that grow almost exclusively corn in irrigated fields has allowed to understand, decompose and analyze the irrigation cost and the economic results of this crop. The data gathered during the 1978 to 1988 campaigns enabled to perform an analysis of the costs, products and yield of the irrigated corn crop. / L'observation et l'analyse des comptabilités réelles de 24 exploitations agricoles pratiquant la quasi-monoculture du maïs-grain en situation irriguée, a permis de cerner, de décomposer et d'analyser le coût de l'irrigation et les résultats économiques de cette culture. Les données recueillies au cours des campagnes 1978 à 1988 ont permis d'effectuer l'analyse de l'évolution des charges, des produits et de la rentabilité de la culture du maïs-grain irriguée