Abstract
The title lanthanide complex, [Er2(C6H2O4)3(H2O)6]·18H2O, is isostructural with its La, Gd, Yb and Lu analogues. The Er3+ ion, located on a threefold rotation axis, is nine-coordinated in a distorted tricapped trigonal-prismatic geometry, which is completed by six oxygen atoms from three dhbq2- ligands and three oxygen atoms from coordinated water mol-ecules. Each dhbq2- ligand acts in a μ2-bis-(bidentate) bridging mode to connect two Er3+ ions to form honeycomb (6,3) two-dimensional sheets extending in the ab plane, having an Er⋯Er separation of 8.7261 (2) Å. In the crystal, extensive O-H⋯O hydrogen-bonding inter-actions involving the coordinated water mol-ecules and the water mol-ecules of crystallization, as well as the oxygen atoms of the dhbq2- ligands, generate an overall three-dimensional supra-molecular network.
Highlights
The title lanthanide complex, [Er2(C6H2O4)3(H2O)6]Á18H2O, is isostructural with its La, Gd, Yb and Lu analogues
The Er3+ ion, located on a threefold rotation axis, is nine-coordinated in a distorted tricapped trigonal–prismatic geometry, which is completed by six oxygen atoms from three dhbq2À ligands and three oxygen atoms from coordinated water molecules
Each dhbq2À ligand acts in a 2-bis(bidentate) bridging mode to connect two Er3+ ions to form honeycomb (6,3) two-dimensional sheets extending in the ab plane, having an ErÁ Á ÁEr separation of 8.7261 (2) A
Summary
Over the past few decades, lanthanide-based coordination polymers (LnCPs) have attracted significant attention because their high photoluminescence efficiency and long luminescence lifetime in lighting and full-colour displays (Parker, 2000; Bunzli & Piguet, 2005; Cui et al, 2018). Lanthanide ions feature high coordination numbers and flexible coordination geometries, which facilitate the formation of diverse extended structures. Since lanthanide(III) ions have a high affinity to hard donor atoms, ligands containing oxygen atoms such as carboxylic acids (Xu et al, 2016), phosphoric acids (Mao, 2007), calixarenes (Ovsyannikov et al, 2017) and -diketones (Vigato et al, 2009) have been used extensively in the synthesis of new types of LnCPs. On the basis of the above considerations, we selected 2,5dihydroxy-1,4-benzoquinone (H2dhbq) as the ligand to react with erbium(III) nitrate hexahydrate under solvothermal conditions to construct a new erbium(III)-based CP, [Er2(dhbq)3(H2O)6]Á18H2O, (I), which is isotypic with its La, Gd, Yb and Lu analogues (Abrahams et al, 2002).
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