Solvent dependent formation of Cu (II) complexes based on isonicotinamide ligand

Five solvent-dependent Cu(II) compounds have been synthesized with [Cu(μ-OAc)(μ-Pip)(MeOH)]2 (OAc = acetate; Pip = 1,3-benzodioxolecarboxylate) and isonicotinamide (Isn) as an auxiliary ligand in different solvents. In all the compounds, Pip units are displaced resulting in dimeric [Cu(μ-OAc)(OAc)(Isn)2(solvent)]2 (solvent = MeOH (2a), dmf and H2O (3) or H2O and HPip (4a)), paddle-wheel [Cu(μ-OAc)2(Isn)]2·2dmso (5) or monomeric compounds [Cu(OAc)2(HOAc)(Isn)2]·HOAc (6). All of them have been characterized by analytical and ATR-FTIR techniques and their X-ray crystal structures solved. The OAc anions construct different arrays and exhibit different coordination modes depending on the solvent used. The supramolecular expansion is constantly determined by the amide-amide pattern and the role of the occluded solvent molecules. This tendency is confirmed by Hirshfeld Surface analysis. Finally, the thermal stability of compound 4a has been analyzed

Benzoate substituents effects on the structure of Zn(II) complexes and 1D 4,4'-bipyridine derived coordination polymers

The aim of this work is to study the influence of different substituents in two closely related ligands, 3,5-dihydroxybenzoate (3,5-(HO)2Bz) and 3,5-dimethoxybenzoate (3,5-(MeO)2Bz), in the structure of zinc complexes. The compound [Zn(3,5-(MeO)2Bz)2(CH3OH)]2 (2) has been synthesized, characterized and its crystal structure elucidated, showing a paddle wheel type dinuclear molecule, with four bridging carboxylate ligands in a syn-syn coordination mode and methanol molecules in the apical positions. This discrete structural array is different than the polymeric structure observed in {[Zn(µ-3,5-(HO)2Bz)(µ-OH2)(H2O)2]·3,5-(HO)2Bz·4H2O}n, previously reported in our group. These two zinc complexes were used as precursor for the synthesis of coordination polymers (CPs) with the 4,4′-bipyridine (4,4′-bpy) linker. The solvent used in their synthesis influences the chemical composition of this CPs. Thus, {[Zn(3,5-(HO)2Bz)2(µ-4,4′-bpy)]·2DMSO}n (3) was achieved in dimethylsulfoxide (DMSO) while {[Zn(3,5-(HO)2Bz)2(µ-4,4′-bpy)]·4,4′-bpy·1/2CH3OH}n (4) was formed in methanol (MeOH) as solvent. The reaction of 2 with 4,4′-bpy yielded [Zn2(μ-3,5-(MeO)2Bz)4(µ-4,4′-bpy)]n (5) in methanol, while after recrystallization in boiling water, complex {[Zn(3,5-(MeO)2Bz)2(µ-4,4′-bpy)]·H2O}n (6) was isolated in low yield. This compound 6 can also be synthesized by a mechanochemical approach, using water in a liquid assisted grinding. The crystal structures of complexes 3, 4 and 6 were elucidated, all three showing zigzag polymeric arrays. Both polymers containing 3,5-(MeO)2Bz (5 and 6), showed solid state luminescence

Proyecto de innovación en tutorias para alumnos de ingeniería química

El proyecto de acción tutorial se ha llevado a cabo en los cinco cursos de la titulación con un doble enfoque. Por una parte se han organizado grupos de tutoría de unos cinco alumnos en los que se han realizado actividades orientadas a mejorar el rendimiento académico, apoyo en la toma de decisiones, mejora del conocimiento que los alumnos tienen sobre la Universidad y los servicios y actividades que pueden realizar. Por otra parte, se han organizado actividades por cursos o varios cursos, para informar sobre temas generales de su interés, facilitar la realización de prácticas y apoyar a los alumnos de último curso en la incorporación al mercado laboral