- A halogen-bonding-based heteroditopic receptor for alkali metal halides
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A new heteroditopic receptor for alkali metal halides has been designed and synthesized. It is comprised of a well-established motif for cation binding and a motif for halogen-bonding-based anion recognition processes. The single-crystal X-ray structure of the complex between the heteroditopic receptor and sodium iodide is reported. Thanks to the cooperativity of metal coordination and the strong I-...I halogen bonding, the ion pair is fully separated. The boosting effect of the binding of the anion through halogen bonding on the coordination of the cation by the receptor has been proved also in solution by NMR experiments. The selectivity of the new heterotopic receptor toward different alkali metal halides has been tested by ESI mass experiments. Copyright
- Mele, Andrea,Metrangolo, Pierangelo,Neukirch, Hannes,Pilati, Tullio,Resnati, Giuseppe
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- Halide anions driven self-assembly of haloperfluoroarenes: Formation of one-dimensional non-covalent copolymers
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The supramolecular organization in six solid assemblies involving iodo- and bromoperfluoroarene derivatives is described. Single crystal X-ray analyses show that the formation of the supramolecular architectures is controlled by I-?Br-ArF, I-?I-ArF, Br-?I-ArF, and Cl-?I-ArF halogen bondings thus proving the X-?X′-ArF supramolecular synthon, where X can be the same as or different from X′, is particularly robust. In five of the described architectures halide anions form two halogen bondings and form infinite chains wherein dihaloperfluoroarenes, which function as bidentate electron acceptors, and halide anions, which function as bidentate electron donors, alternate. This behaviour shows halide anions have a fair tendency to work as bidentate halogen bonding acceptors.
- Abate, Antonio,Biella, Serena,Cavallo, Gabriella,Meyer, Franck,Neukirch, Hannes,Metrangolo, Pierangelo,Pilati, Tullio,Resnati, Giuseppe,Terraneo, Giancarlo
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experimental part
p. 1171 - 1177
(2010/04/03)
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- SYNTHESIS AND CHARACTERIZATION OF A NEW MACROBICYCLIC (CRYPTAND) SIDEROPHORE CONTAINING THREE ENDOCYCLIC HYDROXAMATE DONOR GROUPS
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The first trishydroxamate cryptand ligand was synthesized by tripodal coupling of a tris acid chloride and a tris O-benzylhydroxylamine.The spectrophotometric properties of its Fe(III) complex were investigated and compared with those of desferriferrioxamine B.Its 1:1 Ga(III) complex was also prepared and characterized.
- Sun, Yizhen,Martell, Athur E.
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p. 2725 - 2736
(2007/10/02)
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