Modular Assembly of a Functional Polyoxometalate-Based Open Framework Constructed from Unsupported Ag~I centre dot centre dot centre dot Ag~I Interactions

摘要

Polyoxometalates (POMs), anionic transition-metal oxide clusters, represent a vast class of inorganic materials with a virtually unmatched range of physical and chemical properties relevant for applications as diverse as medicine and biology, magnetism, materials science, and catalysis. It is this unique range of properties which qualifies POM-based materials as prime candidates for the designed construction of molecular-framework materials. Polyoxometalates cover an enormous range in size and structure and thereby provide access to a huge library of readily available and controllable secondary building units (SBUs) which can be interconnected by an electrophilic linker. This crucial step in the assembly of functional POM frameworks has so far been achieved by using organic linkers or by ligand-supported transition-metal bridges; both approaches however are limited by the reduced framework stability intrinsic to metal-organic framework materials. In contrast, the assembly of purely inorganic POM-based frameworks offers high potential for the formation of a new type of porous materials which combines the thermodynamic stability of zeolites and mesoporous silicas with the sophistication and versatility of metal-organic frameworks (MOFs).