Emissive lead(II) benzenedicarboxylate metal-organic frameworks

Abstract

Two known Pb(II) metal-organic frameworks (MOFs), pseudo-supramolecular isomeric pairs synthesized namely, [Pb 3 (BDC) 3 (DMF) 3.5 ] (1) and [Pb(BDC)(H 2 O)] (2) (where BDC = benzenedicarboxylate) were synthesized and reexamined their structures to determine the topology of the networks. In that 1 displayed a 3D (10,3)-b linked network with having the ths topology whereas 2 shows a (6,3) 2D layers interconnected to a 3D framework structure. Remarkably, the desolvation of both 1 and 2 cause structural transformation to a known 3D network structure of [Pb(BDC)] n (3) as established by X-ray powder diffraction patterns. Photoluminescence studies in the solid-state at room temperature of 1-3 compounds exhibit interesting luminescence close to white light region due to ligand-to-metal charge-transfer (LMCT).

Facile and Fast Transformation of Nonluminescent to Highly Luminescent Metal–Organic Frameworks: Acetone Sensing for Diabetes Diagnosis and Lead Capture from Polluted Water

“…To exploit and further demonstrate the versatility of the MOF transformation mechanism described above, we explored the conversion of OX-1 to other types of MOFs incorporating a different metal ion. We selected Pb as the secondary metal ion based on two main reasons: (i) first, because it has been previously reported that Pb-BDC MOFs are luminescent, and thus, the transformation could be easily followed by irradiating the mixture with a UV light and (ii) second and most importantly, Pb metal ions are a highly toxic pollutant that can be found in aquatic environments. , Therefore, if OX-1 can be quickly transformed to a Pb-MOF, it could be an interesting approach to capture Pb ions from polluted water.…”