Selective monitoring of parts per million levels of CO by covalently immobilized metal complexes on glass

摘要

Optical detection of parts-per-million (ppm) levels of CO by a structurally well-defined monolayer consisting of bimetallic rhodium complexes on glass substrates has been demonstrated. Selective detection of chemicals at low concentrations is one of the most promising applications of molecular-based thin films. Various sol-gels, polymers, and other solid-state systems have been reported to detect traces of gases. In particular, mono-layers formed from well-defined organic compounds or metal complexes are known to selectively interact with gaseous compounds. For instance, the cavitand headgroups at the surface of resorcin[4]arene-based monolayers on gold act as molecular recognition sites for small organic molecules with remarkable selectivity for perchloroethylene.