Controlling the Guest Release from Electro-Active Self-Assembled Cages

Controlling the Guest Release from Electro-Active Self-Assembled Cage

Supramolecular Redox Transduction: Macrocyclic Receptors for Organic Guests

The growth of supramolecular chemistry over the last decades has been materialized by the production of an extraordinary wide variety of macrocyclic receptors designed for binding ionic or neutral guests. In this chapter, the specific case of macrocyclic redox-responsive reporters for organic molecules, be they charged or neutral, is covered through illustrative examples of the recent literature. The recognition of small organic molecules, possibly chiral, and of macromolecules of biological interest is considered, with a special emphasis on selected applications. The chapter also addresses the recognition of redox-active organic guests by macrocyclic receptors through various examples. It presents several illustrative examples of redox-active self-assembled macrocycles. The design of the redox-receptor itself remains of critical importance, in particular in connection with the structural characteristics of the targeted guests

Phosphorescent self-assembled PtII tetranuclear metallocycles

A series of rigid Pt(ii) diimine diacetylide complexes and their corresponding metallocyclic derivatives were synthesized through coordination-driven self-assembly. The photophysical properties of these complexes have been studied in detail, revealing exceptionally high RT phosphorescence quantum yields and lifetimes when the excited state becomes localized on the [small pi]-conjugated bridging-ligand following intramolecular charge-transfer sensitization

A Metal-Directed Self-Assembled Electroactive Cage with Bis(pyrrolo)tetrathiafulvalene (BPTTF) Side Walls

A straightforward synthesis of a bis-(pyrrolo)tetrathiafulvalene (BPTTF)-based tetratopic ligand bearing four pyridyl units is described The first example of a TTF-based self assembled cage has been produced from this redox-active ligand through metal directed synthesis with a cis-coordinated square-planar Pt(II) complex. The resulting cage corresponds to a trigonal-prismatic structure, as shown by X-ray crystallography. A UV-vis titration indicated that the electron-rich cavity can be used to incorporate one molecule of tetrafluorotetracyano-p-quinodimethane (TCNQF(4))