Synthesis, crystal structure, and luminescence properties of a new microporous europium silicate: Na3EuSi6O15·1.47H2O

Abstract

A new microporous europium silicate, Na₃EuSi₆O₁₅·1.47H₂O (denoted as 1), was synthesized under high-temperature and high-pressure conditions, and structurally characterized by single-crystal and powder X-ray diffraction (XRD) analysis. The single-crystal XRD analysis of 1 revealed that its structure is based on corrugated silicate single layers with the composition [Si₂O₅] in the ab plane containing 4-, 5-, 6-, and 8-rings, which are connected together by EuO₇ polyhedra via vertex oxygen atoms forming a three-dimensional framework of 1. Compound 1 contains 4, 8-ring channels along the [100] direction and 5-, 6-ring channels along the [001] direction delimited by SiO₄ tetrahedra and EuO₇ polyhedra. The Na⁺ ions are located in the free void space to balance the charge. The photoluminescence properties of 1 were also investigated.