ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis, crystal structure, thermal behavior, and fluorescence property of lanthanide complexes based on 2,6-dimethylbenzoic acid and 1,10-phenanthroline

Xin-Xin Wang, Ning Ren, Yuan-Yuan Ma, Li-Na Geng, and Jian-Jun Zhang

Testing and Analysis Center, Hebei Normal University, Shijiazhuang, People’s Republic of China

E-mail: ningren9@163.com

Received: 5 January 2022  Accepted: 1 April 2022

Abstract:

Three dinuclear lanthanide complexes were prepared using 2,6-dimethylbenzoic acid and 1,10-phenanthroline as main ligand and auxiliary ligand, namely: [Eu(2,6-DMBA)₃(phen)]₂(1), [Gd(2,6-DMBA)₃(phen)]₂·1.5H₂O(2) and [Tb(2,6-DMBA)₃(phen)]₂·2.5H₂O(3) (2,6-DMBA = 2,6-dimethylbenzoate; phen = 1,10-phenanthroline) and characterized by Raman spectroscopy, infrared spectroscopy, single crystal X-ray diffraction, elemental analysis and thermogravimetric analysis. Single-crystal X-ray diffraction shows that the three complexes were centered on 9 coordination Ln(III) ions and form a single hat tetragonal inverse prism geometry with surrounding nitrogen and oxygen atoms. The adjacent structural units form a 1D chain structure through C–H^…O hydrogen bond interaction. TG-DSC/FTIR was used to study the thermal decomposition mechanism of the complexes and the main components of gases escaping during the decomposition process. Solid-state fluorescence studies showed that complexes 1 and 3 emitted strong red and green light, respectively.

Graphical abstract

Keywords: Lanthanide complexes; Crystal structure; Thermal analysis; Luminescence property

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02211-2

Chemical Papers 76 (8) 5267–5280 (2022)