Selective Optical Recognition and Quantification of Parts Per Million Levels of Cr⁶⁺ in Aqueous and Organic Media by Immobilized Polypyridyl Complexes on Glass

Selective optical sensing of parts per million levels of Cr(6+) in water under acidic conditions with robust, osmium-chromophore-based monolayers is demonstrated. The sensor system can be reset by washing with water at neutral pH and can be readily monitored by UV/vis spectroscopy.