Photoluminescent Mixed-Ligand Europium(III) Complex with 3,4-Dichloroisothiazole-5-Carboxylic Acid and 1,10-Phenanthroline

• Published in: Journal of structural chemistry 2024-02, Vol.65 (2), p.289-300
• Main Authors: Sanzhenakova, E. A., Smirnova, K. S., Pozdnyakov, I. P., Lider, E. V.
• Format: Article
• Language: English
• Subjects: Atomic; Atomic/Molecular Structure and Spectra; Carboxylic acids; Chemical analysis; Chemistry; Chemistry and Materials Science; Coordination compounds; Europium; Europium compounds; Infrared spectroscopy; Inorganic Chemistry; Ligands; Molecular; Optical and Plasma Physics; Photoluminescence; Physical Chemistry; Single crystals; Solid State Physics; Structural analysis; X ray powder diffraction; X-ray diffraction
• ISSN: 0022-4766; 1573-8779
• DOI: 10.1134/S0022476624020070

The structural characterization of 3,4-dichloroisothiazole-5-carboxylic acid is performed for the first time along with the preparation of the first coordination compound based on it - a mixed-ligand europium(III) complex with 3,4-dichloroisothiazole-5-carboxylic acid and 1,10-phenanthroline. The coordination compound is characterized by the elemental analysis, single crystal and powder X-ray diffraction (XRD), and IR spectroscopy. According to the single crystal XRD data, the obtained complex is a binuclear compound with the formula [Eu 2 L 6 (phen) 2 (H 2 O) 2 ]·6H 2 O. Its structure corresponds to the Chinese lantern type. The isothiazole derivative exhibits both monodentate and bidentate-bridging coordinations binding europium ions. The photoluminescent properties of a polycrystalline sample of the complex are studied: the luminescence quantum yield is 23%, the excited state lifetime is 0.8 ms.