Yeda Research and Develpment & Co. Ltd

The Weizmann Institute of Science

Tarkeshwar Gupta

Milko E Van Der Boom

David Rosenblatt

Atindra D Shukla

Graham De Ruiter

A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.

Redox-active structures and devices utilizing the same

The present invention relates to a molecular-based system for the optical detection, quantification and detoxification of hexavalent chromium (Cr) by reversible metal-substrate electron transfer. More particularly, the invention provides a Crsensor device comprising a divalent osmium (Os)-, iron (Fe)- or ruthenium (R)-based pyridyl complex capable of changing its oxidation state in response to a reduction of Crat the presence of H, thereby causing a reversible and optically readable change in optical properties of said complex. The Os-, Fe- or R-based pyridyl complex used according to the invention can be used for selective detection and quantification of Cr, as well as for catalytic detoxification of Cr.

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Rehovot, Israel

Tarkeshwar Gupta