Functionalization of inorganic nanomaterials with pillar[n]arenes.

Pillar[n]arenes, which consist of hydroquinone units linked by -CH2- bridges at 2,5-positions, are a relatively new class of synthetic macrocycles since 2008. Their facile preparation and flexible modification properties make them ideal stabilizers for inorganic nanomaterials. Furthermore, their symmetrical and columnar architectures with very rigid and π-rich cavities endow them with rich host-guest properties. This Feature Article provides an overview of the functionalization of inorganic nanomaterials with pillar[n]arenes and their applications. These inorganic nanomaterials are classified into three major classes according to different types of compositions: (1) novel metal nanomaterials; (2) hybrid metal nanomaterials; and (3) porous materials. The applications of these nanomaterials such as catalysis, drug delivery, cancer therapy, and sensing have been comprehensively discussed.