A practical material based on 2,6-dihydroxybenzoic acid: Facile synthesis, strong fluorescence and high-efficiency antibacterial performance

• Published in: Inorganic chemistry communications Vol. 79; pp. 33 - 36
• Main Authors: Xiang, Hua, Lin, Mu-Xiong, Jian, Dan-Feng, Guo, Sha-Sha, Gong, Yi-Xian, Li, Jun, Li, Yu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2017
• Subjects: 2,6-Dihydroxybenzoic acid; Antibacterial activity; Fluorescence properties; Practical material; Terbium(III) complex; Antibacterial activity; Fluorescence properties; Practical material; 2,6-Dihydroxybenzoic acid; Terbium(III) complex
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2017.03.018

A terbium complex [Tb(2,6-dhb)3(H2O)4]·2H2O (1) was directly precipitated when reacting Tb(NO3)3·6H2O with 2,6-dihydroxybenzoic acid (2,6-Hdhb) in the presence of KOH. 1 has been characterized by single-crystal X-ray diffraction, EA, FT-IR, PXRD, TG, SEM, UV–Vis, Fluorescence Microscopy and Photoluminescence spectroscopy. The fluorescence properties indicate that 1 shows typical terbium complex emission both in solid state and in organic solutions, along with a luminescence quantum yield of 26.53% in the solid state, indicative of the presence of a quantitative energy transfer from the ligand to the metal. Furthermore, 1 still emits strong green light even after heating in the oven for half an hour. Biological studies reveal that 87% of Escherichia coli cells and 77% of Staphylococcus aureus cells are killed by the aqueous solution of 1. Taken together, facile synthesis, strong and heat-stable fluorescence and high antibacterial capability make 1 a rather practical bifunctional material, showing promise for anti-counterfeiting and biological applications. A practical material [Tb(2,6-dhb)3(H2O)4]·2H2O (1), prepared by a facile, economical and environment-friendly method, has been characterized by single-crystal X-ray diffraction, EA, FT-IR, PXRD, TG, SEM and UV–Vis. 1 shows strong and heat-stable fluorescence with the luminescence quantum yield of 26.53%. Biological studies reveal that 87% of Escherichia coli cells and 77% of Staphylococcus aureus cells have been killed by the aqueous solution of 1. [Display omitted] •A facile, economical and environment-friendly method to synthesize 1 in high yields.•Single-crystal X-ray diffraction, EA, FT-IR, PXRD, TG, SEM, UV-Vis, Fluorescence Microscopy and Photoluminescence spectroscopy studies.•Strong green fluorescent emission of 1 in solid state with the luminescence quantum yield of 26.53%.•A high effective antibacterial activity of 1 against Escherichia coli (gram +ve) and Staphylococcus aureus (gram –ve).