Development of a fluorescent chelating ligand for scandium ion having a Schiff base moiety

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 90; pp. 72 - 77
• Main Authors: Yamada, Hiroshi, Kojo, Masahito, Nakahara, Tomomi, Murakami, Kumi, Kakima, Takashi, Ichiba, Hideaki, Yajima, Takehiko, Fukushima, Takeshi
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 01.05.2012
• Subjects: 1-(2-Hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone; Benzaldehydes - chemistry; Chelating Agents - chemistry; Fluorescence; Fluorescent Dyes - chemistry; Hydrazones - chemistry; Hydrogen-Ion Concentration; Ligand; Ligands; Limit of Detection; Metal-ion complex; Rare earth metal; Scandium - chemistry; Scandium ion; Schiff Bases - chemistry; Spectrometry, Fluorescence; Spectrophotometry, Ultraviolet; Fluorescence; Scandium ion; Rare earth metal; Ligand; Metal-ion complex; 1-(2-Hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2012.01.014

[Display omitted] ► A novel fluorescent ligand, HMB-ASH, for Sc3+ was developed. ► The fluorescence at 512nm was most intense in the buffer at pH 8.0. ► Binging ratio of HMB-ASH to Sc3+ was 1:1. ► Few foreign ions except Fe3+ could interfere with the complex of HMB-ASH to Sc3+. ► The interference by Fe3+ was suppressed by adding thiocyanato ion. A fluorescent ligand, 1-(2-hydroxy-3-methoxybenzaldehyde)-4-aminosalicylhydrazone (HMB-ASH), was newly designed and synthesized, and its fluorescence characteristics for metal ions were investigated in the pH range 3.0–10.5 (at a difference of 0.5 for each metal). After testing 31 different metal ions, it was found that HMB-ASH was able to emit fluorescence intensely at 512nm with an excitation wavelength of 353nm in the presence of Sc3+, one of the rare earth metals, at pH values around 3.5 and 8.0. The other metal ions hardly showed fluorescence with HMB-ASH. The fluorescence was more intense at pH 8.0, and the detection limit of Sc3+ in a buffer solution (pH 8.0) was approximately 18.8nmolL−1 (0.85ppb).