Hosting a Radioactive Guest: Binding of 99TcO4- by a Metalated Cyclotriveratrylene

Organometallic cavitands: Cation–π interactions and anion binding via π-metallation

“…have synthesised lariat ethers with pendant arms containing alkene, alkyne and arene groups (10)(11)(12) to study the interaction of the side arms with the metal cation. Binding of Na + and K + by the macrocycle is observed but solid-state structures of 10 and 11 show that there is no interaction between the side arms and the metal cation [50,51].…”

“…Metal-binding by cavitands containing aromatic -surfaces and the resulting modifications in their properties is of enduring interest [1][2][3][4][5][6][7][8][9][10][11][12][13]. The calixarenes and their relatives, particularly the partially pre-organised cone isomer of calix [4]arenes have been studied for many years in this regard, Fig.…”

Cationic Cobaltammines as anion receptors: a convenient synthesis, characterization and X-ray structure of [CO(NH3)6]ClSeO4·3H2O

“…Traditional design has relied on the use of hydrogen donors and cationic Lewis acid site-attracting anions. More recently, the value of weak interactions such as C-HÁ Á Á interactions has been recognized [10] and the use of selective extractants to extract oxoanions [11,12] such as cationic polyamines, calixarenes, azacages or open chain counterparts has been investigated. Recovery and recycling of oxoanions is necessary, as these species are problematic contaminants in soil and water [11] because they are either toxic [13], environmentally undesirable or radioactive.…”

Anion sensing ‘venus flytrap’ hosts: a modular approach

“…The design and synthesis of host molecules able to bind anionic guests in a fashion detectable to an observer electrochemically or via changes in fluorescence intensity is a topic of intense current interest. [1][2][3][4][5][6] Potential applications include the detection and remediation of environmentally relevant anions such as nitrate, phosphates, pertechnetate 7 and chromate 8 as well as monitoring biochemical levels of chloride. In general positively charged hosts offer scope for obtaining the largest binding constants, however, the non-directional electrostatic forces involved mean that these must be moderated by a preorganised host geometry and suitably placed directional binding sites.…”