A new PbII(ethylenediaminetetraacetate) coordination polymer with a two-dimensional layer structure

Abstract

A new Pb^II−edta^4– coordination polymer, Pb₂(edta)(H₂O)_0.76 (edta^4– = ethylenediaminetetraacetate) was synthesized under hydrothermal condition. Single crystal X-ray analysis reveals that it represents a novel two-dimensional (2D) Pb²⁺–edta^4– layer structure with a (4,8²)-topology. Each edta^4– ligand employs its four carboxylate O and two N atoms to chelate one Pb^II atom (hexa-coordinated) and connects five Pb^II atoms (ennea-coordinated) via its four carboxylate groups to form 2D layer framework. Adjacent layers are packed into the overall structure through vander Waals interactions.