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Cover Picture: Complexation‐Induced Supramolecular Assembly Drives Metal‐Ion Extraction (Chem. Eur. J. 40/2014)

2014; Wiley; Volume: 20; Issue: 40 Linguagem: Inglês

10.1002/chem.201490166

1521-3765

Ross J. Ellis, Yannick Meridiano, Julie Muller, Laurence Berthon, Philippe Guilbaud, Nicole Zorz, Mark R. Antonio, Thomas Demars, Thomas Zemb,

Lanthanide and Transition Metal Complexes

A multiscale approach has been used to link metal-ion coordination with nanoscale structure to reveal the free-energy balance that drives the phase transfer of neutral metal salts. This study gives structural insight into the intricate relationship between the hard metal-ion complexation interactions and the soft long-range interactions between aggregates. The cover art (by Sana Sandler, Argonne National Laboratory) depicts a malonamide amphiphile, which has been used to extract Eu(NO3)3 from water into oil, through the water–oil interface. Such metal separation techniques are important in the efficient reprocessing of nuclear waste and the refining of rare-earth elements. For more details, see the Full Paper by R. J. Ellis, L. Berthon, P. Guilbaud et al. on page 12796 ff. A multiscale approach has been used to link metal-ion coordination with nanoscale structure to reveal the free-energy balance that drives the phase transfer of neutral metal salts. This study gives structural insight into the intricate relationship between the hard metal-ion complexation interactions and the soft long-range interactions between aggregates. The cover art (by Sana Sandler, Argonne National Laboratory) depicts a malonamide amphiphile, which has been used to extract Eu(NO3)3 from water into oil, through the water–oil interface. Such metal separation techniques are important in the efficient reprocessing of nuclear waste and the refining of rare-earth elements. For more details, see the Full Paper by R. J. Ellis, L. Berthon, P. Guilbaud et al. on page 12796 ff. Coordination Chemistry It is well established that alkane complexes are intermediates, with their own discrete reaction coordinate minima, along the pathway to CH activation. A mixture of serendipitous discovery and intelligent design has led to the synthesis of sufficiently long-lived alkane complexes that can be characterized by employing non-specialized equipment, such as NMR spectroscopy and X-ray diffractometry. For more details, see the Minireview by R. D. Young on page 12704 ff.1 Direct Cyclization A straightforward construction of 9-arylacridine molecules was achieved through the direct cyclization of tritylamines involving two CH and one CN bond cleavages in the presence of copper acetate under a normal pressure of molecular oxygen. Mechanistic investigations, including a 15N-labeled crossover experiment, suggested that this novel cyclization involves an associative pathway with respect to the CN bond formation/cleavage after the first CH bond cleavage step. Notably, some of obtained acridine derivatives exhibit intense fluorescence in the solid state. For more details, see the Communication on page 12720, by T. Satoh, M. Miura et al.1 Switchable Anion Receptor The conformation of bispyrrolylbenzene anion receptor can be controlled by a proper anionic stimuli. Addition of fluoride anion gradually changes the conformation of this receptor. It was demonstrated that switchability of this building block allowed it to act as INHIBIT and NAND molecular logic gates using fluoride and dihydrogenphosphate anions as inputs and UV/Vis or fluorescence readout, respectively. For more information, see the Full Paper by J. Jurczak et al. on page 12790 ff.1