2205867-69-0Relevant articles and documents
Supramolecular anion recognition in water: synthesis of hydrogen-bonded supramolecular frameworks
Morshedi, Mahbod,Thomas, Michael,Tarzia, Andrew,Doonan, Christian J.,White, Nicholas G.
, p. 3019 - 3025 (2017)
The interaction of tetratopic amidinium-containing receptors with terephthalate anions leads to porous framework materials assembled through charge-assisted hydrogen bonds. The frameworks form in good yield within minutes in water at room temperature, but no framework material is obtained if other anions (Cl-, Br-, NO3-, SO42- or isophthalate2-) are used in place of terephthalate. Two forms of the framework can be prepared: one with a connected pore network, and a more dense phase with discrete voids. We demonstrate that these are the kinetic and thermodynamic products, respectively. Either framework can be prepared independently and can be converted to the other form in response to stimuli. Furthermore, the frameworks can be controllably disassembled and reassembled in response to acid/base triggers suggesting that this new class of materials may have applications in the selective encapsulation and release of guests.
Mixed halide/oxoanion-templated frameworks
Morshedi, Mahbod,White, Nicholas G.
, p. 2367 - 2371 (2017/07/15)
A tetrahedral tetra-amidinium compound 14+ was crystallised in the presence of a range of anions (Cl-, Br-, NO3-, oxalate2-) giving a range of interesting solid state structures assembled through amidinium?anion hydrogen bonding interactions. Mixing the chloride or bromide salts of 14+, i.e.1·4Cl or 1·4Br, and inorganic oxalate salts in water gave crystals of ordered three-dimensional network structures containing both oxalate and halide anions. These interesting mixed anion frameworks exhibit high thermal stability to heat and hydrolysis but are not significantly porous. Importantly, these materials are significantly more robust than the analogous terephthalate-containing framework materials.
