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Study on Cyclometalated Palladium‐azo Complexes as Colorimetric Probes for Hazardous Gas in Water
Author(s) -
Yu ChunWei,
Li ShunHua,
Zheng Hong,
Xu JinGou
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790146
Subject(s) - chemistry , aqueous solution , magenta , titration , palladium , naked eye , standard solution , methylene blue , inorganic chemistry , detection limit , chromatography , organic chemistry , catalysis , materials science , photocatalysis , inkwell , composite material
Abstract A synthesized cyclometalated palladium‐azo complex was explored as a multifunctional probe for visual detection of SO 2 , H 2 S and NH 3 in water. In acidic aqueous environment, the sensing solution underwent a sharp color change from poor violet to deep blue when titrated with Na 2 SO 3 standard solution. But the color changed from poor violet to bright yellow when titrated with Na 2 S standard solution. In basic environment, the sensing solution rapidly changed to magenta when titrated by NH 4 Cl‐NH 3 standard buffer solution at high concentration. However, the color of sensing solution changed to blue when titrated by NH 4 Cl‐NH 3 standard buffer solution at low concentration although the pH was kept constant during the titration. Different species of these hazardous gases at environmentally relevant concentration levels were differentiated by independent optical signal outputs, and the interference from other inorganic ions commonly existing in water was very small.