Sequestering Perrhenate with a Borate-Based Coordination Polymer: A Model for Pertechnetate Separation

Crystals of the layered metal organic framework solid Pb[B(Im)4](NO3)(nH2O) can undergo exchange of the nitrate for perrhenate,
a model for pertechnetate, forming Pb[B(Im)4](ReO4). We can
monitor this reaction by 207Pb solid-state NMR and can isolate
single crystals of the resultant material through growth in the
presence of an excess of perrhenate. Such a synthetic metal−organic framework solid represents a new candidate for pertechnetate-sequestering materials.