Luminescent properties of the metal-organic framework Zn(pvmb)

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)