A dual-function europium sulfite–oxalate complex for proton conduction and selection of Fe3+ ions

Abstract

In this study, a europium(III) sulfite–oxalate complex (compound 1) with a three-dimensional structural arrangement was synthesized by a hydrothermal method. Notably, compound 1 exhibited excellent pH and luminescence stability and demonstrated the capability of detecting Fe³⁺ in water by using fluorescence bursts. The proton conductivity of compound 1 reached 9.48 × 10⁻⁵ S cm⁻¹ at 98% RH (relative humidity) and 75 °C. By studying the crystal structure, fluorescence, and proton conductivity properties of dual-function inorganic–organic hybrid materials, this study provides an important reference for the future development of dual-function inorganic–organic hybrid materials.