Sequential detection of Fe3+/2+ and pyrophosphate by a colorimetric chemosensor in a near-perfect aqueous solution

• Published in: Photochemical & photobiological sciences Vol. 16; no. 12; pp. 1812 - 1820
• Main Authors: Chae, Ju Byeong, Jang, Hyo Jung, Kim, Cheal
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 2017; Royal Soc Chemistry; Royal Society of Chemistry
• Subjects: Anions; Aqueous solutions; Biochemistry; Biochemistry & Molecular Biology; Biomaterials; Biophysics; Chemical sensors; Chemistry; Chemistry, Physical; Chemoreceptors; Colorimetry; Coordination compounds; Detection limits; Drinking water; Environmental protection; Ions; Iron; Life Sciences & Biomedicine; Mass spectrometry; Mass spectroscopy; Physical Chemistry; Physical Sciences; Plant Sciences; Science & Technology; Water analysis; Water sampling; CU2; METAL IONS; RECOGNITION; FLUORESCENT SENSOR; AL3; PPI; MEDIA; SELECTIVE DETECTION; PROBE; LIVING CELLS
• ISSN: 1474-905X; 1474-9092
• DOI: 10.1039/c7pp00354d

A novel colorimetric chemosensor 1 was designed and synthesized for Fe 3+/2+ and pyrophosphate. Sensor 1 showed a selective color change toward both Fe 3+ and Fe 2+ from yellow to brown in a near-perfect aqueous solution. The detection limits (0.36 uM and 0.37 uM) for Fe 3+ and Fe 2+ were much lower than the guideline (5.37 uM) set by the Environmental Protection Agency (EPA) for iron in drinking water. Sensor 1 could be used to quantify Fe 3+ in real water samples. Moreover, the resulting Fe 3+ -21 complex can detect pyrophosphate selectively over various anions especially including phosphate-based anions through a metal-complex displacement method. Based on UV-vis titrations, Job plot and ESI-mass spectrometry analyses, the sensing mechanisms of Fe 3+ ,Fe 2+ and PPi were proposed.