PUB - Publikationen an der Universität Bielefeld

Three new lead based organic frameworks, [Pb(C6H6O2S2N)(2)] (1), [Pb(C12H6O4).(H2O)](n) (2), [Pb(C14H8O4)](n) (3) have been synthesized via hydro/solvothermally using 2-mercapto-3-methyl-4-thiazoleacetic acid (H(2)MMTA), 2,6-naphthalenedicarboxylic acid (2,6-NDA) and biphenyl-4,4-dicarboxylic acid (H(2)BDA) as organic precursors. The resulting metal organic frameworks (MOFs) were characterized by UV/Vis, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), (HNMR)-H-1, Energy dispersive spectroscopy (EDS), Thermogravimetric analysis (TGA) and Powder X-ray diffraction technique. MOF (1) has also been characterized by single-crystal X-ray diffraction method which exhibited a three-dimensional (3D) framework with an octahedral hemidirected environment around each Pb2+ ion. All these MOFs (1 - 3) were screened for their luminescence activity. This luminescence activity has been assigned to metal-centred s -> p transition in case of MOF (1) and ligand-to-metal charge transfer (LMCT) in case of MOFs (2 & 3). Adsorption of N-2 gas by these MOFs was investigated and the results of this study are also part of this manuscript.