No abstract available

No abstract available

No abstract available

[en] Full text: The plethora of possible porous structures that metalorganic frameworks (MOF’s) can present give them high potential for applications that explore physical and chemical properties, such as magnetic, optical, adsorption of gases and controlled release of drugs.[1] In order to tune the structural properties, strategies like the use of longer spacers may be used to increase the volume of channels, which has an impact on the adsorption properties of this class of compounds. In this work, a MOF containing zinc and 3-(2-(4-pyridyl)vinylbenzoic acid as ligand (Hpvmb) with formula Zn(pvmb)2•DMF was synthesized. Photo reactivity studies of the Hmpvb ligand in MOF’s can be explored, since it can be electronically reactive by the incidence of ultraviolet light [2] [3]. The compound was characterized by infrared spectroscopy in the infrared region, thermogravimetric analysis, molecular absorption in the UVvis region, powder X-Ray diffraction and single crystal X-Ray diffraction. Each ligand is covalently connected to two zinc atoms by the pyridinic nitrogen and the carboxylate forming a three dimensional structure. In the absorption spectrum in the Uv-vis region a maximum absorption band at 344 nm is observed and a study of emission and excitation in the compound in the solid state at different wavelengths was carried out. A maximum emission at 435 nm was observed when the compound was excited at 270 nm in the fluorimeter, but measurements of the half-life and quantum yield are in progress. Due to the potential adsorption capacity of the metalorganic frameworks, adsorption studies of gases such as CO₂ and CO will be carried out in the material. References [1] Cook, T.R.; Zheng, Y.R.; Stang, et al, Chemical Reviews, 2013, 113, 734-777. [2] Sharma, M.K.; Lama, P. et al. Crystal Growth Design, 2011, 11, 1411-1416 [3] Frohlinde, D.S.; Blume, H. et al. Journal of Physical Chemistry,1962,66, 2486-249. (author)

[en] Full text: In the search for the development of new materials, metalorganic frameworks have earned prominence because are versatile systems and can show potentials applications due to their molecular structure and topology.1,2 Within this perspective, many MOF’s have been studied and developed with the purpose of creating new magnetic materials and to evaluate their potential applications in the field of molecular magnetism.3 From this perspective, this work shows a new MOF based on manganese(II) ion and the ligand 4-{2-(3-pyridiyl)vinylbenzoic} acid (Hpvmb). The reaction between Hpvmb and Mn(II) ions gave rise to yellow crystals that were characterized by single crystal and powder X-Ray diffraction, UV-Vis and Infrared absorption spectroscopy. The molecular structure consists of Mn(II) ions hexaecoordinated to four pvmb through the carboxylate groups in a monodentate mode and two pvmb through the pyridine groups. Each carboxylate bridges the Mn(II) ions in a h1: h1 mode, extending this arrangement in one direction to form Mn(II) chain. Each pvmb then coordinates to a neighbor equivalent Mn(II) chain via the pyridine group, extending the structure to form a MOF with large channels containing dmf molecules. Each channel has approximately 18.98 in width and 13.13 Å in length. The magnetic characterization as well as adsorption studies are in progress, with preliminary results that shows a potential as a multifunctional material. References: [1] Amabilino, D.B.; Smith, D.K.; Steed, J.W.; Chem. Soc. Rev.,46, 2404-2020 (2017). [2] Cook, T.R.; Zheng, Y.R.; Stang; P.J.; Chem. Rev., 113, 734−777, (2013). [3] Liu, X. Y.; Cen, P. P.; Li, H.; Ke, H. S.; Zhang, S.; Wei, Q.; Xie, G.; Chen, S. P.; Gao, S. L.; Inorg. Chem., 53, 8088−8097, (2014). (author)

[en] Full text: Magnetic systems based on organic ligands, containing different functional groups with different coordination modes when interacting with metal ions of the first transition series, may present interesting electronic, magnetic and optical properties[1-2]. Moreover, the spatial arrangement of the atoms and orbital interactions that occur between the metallic centers across the ligands or intermolecular interactions can be of great importance for the definition of physical properties like magnetic interactions. This work consists of the synthesis and characterization of potential molecular magnetic systems that were synthesized in the form of a complex containing Cu (II) ions coordinated to the oxime 3-formyl-4-hydroxybenzoate (fhbo) and 1,10-phenanthroline as the terminal ligand. The use of phenanthroline avoids the polymerization of the system by the action of fhbo as a bridge ligand, but also allows possible interactions between discrete systems formed through hydrogen interactions or even covalent bonds by oxime oxygen. The green crystals were characterized by infrared spectroscopy (IR), ultraviolet and visible absorption spectroscopy (UV-Vis),powder X-Ray Diffraction (PXRD), and by single crystal X-Ray Diffraction (SCXRD). The coordination could be confirmed by SCXRD, that showed the coordination by two nitrogen atoms from the 1,10-phenantroline, one oxygen atom from the carboxylate moiety of the fhbo, and one water molecule on the basal plane, and one chloride ion on the axial axes, forming a complex with a square-pyramidal geometry. Magnetic studies for this system are in progress. 1]T. Grancha, J. Ferrando-Soria, M. Castellano, M. Julve, J. Pasán, D. Armentano, E. Pardo, Chem. Commun. 2014, 50, 7569. [2]M. Castellano, R. Ruiz-García, J. Cano, J. Ferrando-Soria, E. Pardo, F. R. Fortea-Pérez, S.-E. Stiriba, W. P. Barros, H. O. Stumpf, L. Cañadillas-Delgado, et al., Coord. Chem. Rev. 2015, 303, 110–138. (author)