Crystal structure and photoluminescent properties of a new Eu^III-phthalate-acetate coordination polymer

Abstract

A new coordination polymer, poly[(acetato)aqua(μ3-phthalato)europium(III)], [Eu(C8H4O4)(CH3O2)(H2O)] n or [EuIII(phth)(OAc)(H2O)] (phth2-= phthalate and OAc-= acetate) was synthesized and characterized, revealing it to be a supramolecular assembly of one-dimensional [EuIII(phth)(OAc)(H2O)] chains. Each chain is built up of edge-sharing distorted tricapped trigonal-prismatic TPRS-{EuIIIO9} building motifs and assembled in a regular fashion through hydrogen-bonding and aromatic π-π interactions. The fully deprotonated phth2-ligand was shown to be an effective sensitizer, promoting the characteristic 5D 0→7FJ (J = 1-4) emissions of EuIIIeven in the presence of the non-sensitizing OAc-group.