Molecular containers for NOX gases

Supramolecular approaches to visual detection, storage, conversion and use of NOx gases are described that deploy calixarenes and their derivatives, such as hemicarcerands and synthetic nanotubes. Polymer-supported calixarene materials for NOx are also introduced. Chemical fixation of NO2/NO4 is demonstrated through the transformation into calixarene-NO+ complexes and their use as nitrosonium storing and releasing reagents for organic synthesis. These findings highlight perspectives of supramolecular chemistry and molecular recognition in sensing and fixation of environmentally important gases.