Cover Picture: A pH-Sensitive Lasso-Based Rotaxane Molecular Switch (Chem. Eur. J. 9/2013)

Authors

  • Dr. Caroline Clavel,

    1. Supramolecular Machines and ARchitectures Team (SMART), Institut des Biomolécules, Max Mousseron (IBMM), –UMR CNRS 5247, Université Montpellier 2 et 1 place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5 (France), Fax: (+33) 4-67-63-10-46
    Search for more papers by this author
  • Dr. Camille Romuald,

    1. Supramolecular Machines and ARchitectures Team (SMART), Institut des Biomolécules, Max Mousseron (IBMM), –UMR CNRS 5247, Université Montpellier 2 et 1 place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5 (France), Fax: (+33) 4-67-63-10-46
    Search for more papers by this author
  • Emile Brabet,

    1. Supramolecular Machines and ARchitectures Team (SMART), Institut des Biomolécules, Max Mousseron (IBMM), –UMR CNRS 5247, Université Montpellier 2 et 1 place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5 (France), Fax: (+33) 4-67-63-10-46
    Search for more papers by this author
  • Dr. Frédéric Coutrot

    Corresponding author
    1. Supramolecular Machines and ARchitectures Team (SMART), Institut des Biomolécules, Max Mousseron (IBMM), –UMR CNRS 5247, Université Montpellier 2 et 1 place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5 (France), Fax: (+33) 4-67-63-10-46
    • Supramolecular Machines and ARchitectures Team (SMART), Institut des Biomolécules, Max Mousseron (IBMM), –UMR CNRS 5247, Université Montpellier 2 et 1 place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5 (France), Fax: (+33) 4-67-63-10-46
    Search for more papers by this author

Abstract

original image

Wanted! A new lasso molecular shuttle was synthesized by a self-entanglement strategy. In their Full Paper on page 2982 ff., F. Coutrot et al. describe the efficient preparation of a new lasso molecular switch containing an anilinium template. Trapping of the BMP25C8 macrocycle was achieved by benzylation of the triazole moiety and allowed the isolation of a bi-stable lasso molecular switch, in which benzyltriazolium acts as a gate and a molecular station at the same time. Variation of pH triggered the tightening and loosening of the lasso.

Cartoon 1.

Organocatalysis

The sculpture “Man on a rolling stone” by the Danish artist Erik Heide is integrated into a C2-symmetric molecule as a model for a chiral organocatalyst, which can break the symmetry of anthracene aldehydes (to the left) and maleimides (to the right) and catalyze a highly enantioselective Diels–Alder reaction. For more details, see the Communication by K. A. Jørgensen et al. on page 2932 ff.

Thumbnail image of

Crystalline Polyoxometalate (POM) Isomers

There are many issues regarding how POMs assemble in solution, especially when additional hetero-metals are involved. However, research into such mechanisms by using solution-phase techniques is limited. In their Communication on page 2976 ff., L. Cronin et al. present a unique system, in which intermediate “meta-stable” crystals of new clusters temporarily crystallize out of solution and could be analyzed by using single-crystal X-ray crystallography. This insight combined with an unusual pair of final-product isomers allowed a mechanism of assembly to be proposed, which may allow the design of new transition-metal-substituted POM clusters.

Thumbnail image of

Hierarchical Nanospheres

A facile method has been designed for the large-scale production of hierarchical TiO2 nanorod spheres through deliberately adding TiCl3 into the reaction of resorcinol and formaldehyde. After calcination, the resultant TiO2 nanorod spheres exhibit high photocatalytic performances in eliminating contaminants and killing bacteria under UV or solar-light irradiation. This is of great significance in fabricating well-crystallized hierarchical TiO2 nanorod spheres for water purification. For more details, see the Full Paper by Z. Y. Liu, D. D. Delai et al. on page 3061 ff.

Thumbnail image of

Ancillary