In situ preparation and photophysical properties of a novel europium complex

Under hydrothermal conditions, a novel europium complex [Eu(H2O)2 (Me-IN)3]n·2nH2O·3nClO4 (1; Me ​= ​methyl; IN ​= ​isonicotinic acid) was synthesized in situ and characterized. Complex 1 crystallizes in the monoclinic space group P21/c with four formula units in one cell. Complex 1 is characterized by a one-dimensional (1-D) chain-like structure. The solid state photoluminescence emission is in the red region and the emission peaks should come from the 5D0 → 7F1, 5D0 → 7F2 and 5D0 → 7F4 characteristic emission of the Eu(III) ions. It has a CIE (Commission Internationale de L’Eclairage) chromaticity coordinates of (0.5442, 0.4444). A solid-state UV–visible diffuse reflectance spectrum unveiled that it possesses a wide optical band gap of 4.98 ​eV.