Lead(II) Coordination Sphere and Ligand Coordination Mode Changes During Removal of Water Molecule by Solid‐state Thermal Conversion

Abstract

The solid‐state conversion of a 3D lead(II) coordination polymer, [Pb(1,4‐BDC)(H2O)]n (1) microstructures (1,4‐H2BDC = 1,4‐benzenedicarboxylic acid) with PbO7 coordination sphere, was synthesized by a sonochemical process to a 3D [Pb(1,4‐BDC)]n (2) coordination polymer with nanoparticle morphology and the same coordination environment was observed upon thermal treatment and dehydration. The color of this compound did not change during the process. This process is irreversible and compound 2 cannot absorb water again. Adsorption and desorption of water in these lead(II) coordination polymers were studied by IR spectroscopy, thermo gravimetric and differential thermal analyses (TG‐DTA), X‐ray powder diffraction (XRD), and scanning electron microscopy (SEM).

Solid–Liquid Conversion and Carbon Dioxide Storage in a Calcium-Based Metal–Organic Framework with Micro- and Nanoporous Channels

“…However, unfortunately, the crystallization process of this compound in water was not successful. In an continuation of our previous work on investigating the structural conversion of MOFs , and coordination polymers, − in this case a comparison between the PXRD pattern of the A phase with those of other reported MOFs constructed from Ca 2+ and terephthalic acid in the presence of water was done in order to find some similar patterns (Figure S8 in the Supporting Information). (1) A PXRD pattern (Figure S8 in the Supporting Information) that is attributed to a MOF with the formula [Ca­(BDC)­(DMF)­(H 2 O)] n formula was similar to that of the A phase.…”