Metal-ion chemistry of tetra(meso-4-phenoxy-2-picolyl)-calix[4]pyrrole: An extendable super-cavitand tetrapodal ligand

Kinetics, Thermodynamics, and Modeling of Complex Formation between Calix[4]biscrowns and Cesium

“…This results in a cation which has a smaller hydration radius than the other alkali elements . Some ligands, such as crown ethers, form complexes with Cs + extremely rapidly. ,, A more representative family of these Cs + ligands is that of calix crown ethers, ,,− such as the 1,3-alternate calix[4]arene-crown-6 ethers which can exhibit affinities as high as 10 5 for Cs + in water and up to 10 7 in other solvents such as ethanol or acetonitrile. ,− This led to the recent synthesis of series of cesium-selective fluoro-ionophores. ,,,− Two of these fluorescent molecular sensors consisted of a calix[4]arene-bis(crown-6-ether) and of the same tetrasulfonated molecule to both of which two dioxycoumarins were grafted (Scheme , A1-calix-COU2 and A2-calix-COUSULF). , These molecules exhibited high affinities and selectivities for Cs + . Moreover, the two coumarin fluorophores allowed the detection of complex formation with Cs + by fluorescence emission.…”

“…10 Some ligands, such as crown ethers, form complexes with Cs + extremely rapidly. 6,7,11 A more representative family of these Cs + ligands is that of calix crown ethers, 5,8,[12][13][14][15][16][17][18][19][20] such as the 1,3-alternate calix [4]arene-crown-6 ethers which can exhibit affinities as high as 10 5 for Cs + in water and up to 10 7 in other solvents such as ethanol or acetonitrile. 12,[14][15][16][17] This led to the recent synthesis of series of cesium-selective fluoro-ionophores.…”

A Dinuclear Metallobridged Super Aryl‐Extended Calix[4]pyrrole Cavitand

“…In 2006, Ji et al reported that the tetra-α isomer of meso-(4-phenoxy-2-picolyl) calix- [4]pyrrole afforded a dinuclear cavitand on treatment with Pd II salts. [34] The Pd II ions bridged two adjacent picolyl units by trans-coordination to its nitrogen atoms. In the solidstate, the dinuclear AE-C [4]P cavitand adopted the cone conformation by including one molecule of DMF.…”

Ribose-protected thioguanosine-based 1H NMR spectroscopic probe for the detection of cesium from solid cesium-containing sources in acetonitrile

“…In this regard, traditional detection methods for cesium usually are based on solution samples, for a more convenient and practical purpose, it is of interest whether cesium can be directly detected from solid cesium-containing samples in organic solvents. As for the ionophores, besides the traditional calixarenecrowns [10,16,20], other types of ionophores have been developed to meet various requirements, for example, inorganic clay materials exhibit remarkable Cs + /Na + (CsCl/NaCl) selectivity [21]; inorganic-organic hybrid materials display preferable affinity to cesium over other alkali and alkaline earth metal ions except magnesium [22].Since both radioactive 137 Cs [2,3,8] and nonradioactive 133 Cs [4-9] are deleterious to environment and human health, biologically important small molecules with high cesium-selectivity may be of particular interest due to their biocompatibility. The sulfur analogs of the current nucleic acids constitute a most important type of non-natural nucleic acids (modified nucleic acids).…”

“…In this regard, traditional detection methods for cesium usually are based on solution samples, for a more convenient and practical purpose, it is of interest whether cesium can be directly detected from solid cesium-containing samples in organic solvents. As for the ionophores, besides the traditional calixarenecrowns [10,16,20], other types of ionophores have been developed to meet various requirements, for example, inorganic clay materials exhibit remarkable Cs + /Na + (CsCl/NaCl) selectivity [21]; inorganic-organic hybrid materials display preferable affinity to cesium over other alkali and alkaline earth metal ions except magnesium [22].…”