title: Emission "Off-On" effect from europium complexes triggered by AcO anion: synthesis, characterization and sensing performance.
abstract: In this paper, a series of Eu(III) complexes based on four diamine ligands and two diketone ligands were synthesized. Their single crystal structures were studied, where intermolecular π-π stacking was found. The photophysical parameters of these Eu(III) complexes were measured, along with their ligand triplet levels. The energy transfer mechanism between ligand and metal center was discussed in detail. Energy transfer roll-back was found in Eu(III) complexes owing large-conjugated diamine ligands, compromising emissive performance. This energy transfer roll-back, however, could be stopped by the presence of AcO anion, leading to Eu(III) complex emission enhancement. The sensing performance of such Eu(III) complexes was thus investigated in detail. High sensitivity and selectivity were observed.
authors.affiliation: Industrial & Commercial College, Hebei University, Baoding 071000, China. Electronic address: xiaogangli389@163.com.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Penology, The Central Institute for Correctional Police, Baoding 071000, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Agricultural University of Hebei, Baoding 071000, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
mesh_terms: D000838:Anions / Q000138:chemical synthesis / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D006576:Heterocyclic Compounds, 4 or More Rings / Q000138:chemical synthesis* / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D000838:Anions; D006576:Heterocyclic Compounds, 4 or More Rings; D009942:Organometallic Compounds; D005063:Europium
keywords: AcO; Anion; Emission turn-on; Eu(III); Sensor