Cover Picture: New Vistas in N-Heterocyclic Silylene (NHSi) Transition-Metal Coordination Chemistry: Syntheses, Structures and Reactivity towards Activation of Small Molecules (Chem. Eur. J. 1/2013)

Authors

  • Dr. Burgert Blom,

    1. Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29734
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  • Miriam Stoelzel,

    1. Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29734
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  • Prof. Matthias Driess

    Corresponding author
    1. Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29734
    • Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29734
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Abstract

original image

Initial scant reports of NHSi complexes in the 1990s have been replaced by a plethora of examples across the transition metals today. One of the key elements precipitating this burgeoning development has been the tunable properties of NHSi's and the search for alternative complexes capable of novel or existing, stoichiometric and catalytic transformations. So far substantial progress has been made and NHSi complexes have shown to be active in several important catalytic and stoichiometric processes. For more information see the Review by M. Driess et al. on page 40 ff. Cover picture by Sarah Bergmann.

Cartoon 1.

Porphyrin Synthesis

Porphyrin functionalization strategies are gradually changing by direct functionalizations through C[BOND]H bond cleavage with transition-metal catalysts. In their Communication on page 64 ff., A. Osuka et al. succeeded in palladium-catalyzed direct arylation of meso-formyl porphyrin with aryl bromides that provided β-monoarylated meso-formyl porphyrins regioselectively. The β-arylated formyl porphyrin could be converted to a twisted meso–meso vinylene-bridged diporphyrin by McMurry coupling.

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Analytical Methods

A novel matrix system, that is, functional single-walled carbon nanohorns (SWNHs), for mass spectrometric analysis of small biomolecules including peptides, amino acids, fatty acids, and ATP is reported by H. Ju, Z. Cai et al. in their Full Paper on page 102 ff. By combining the advantages of SWNHs with the specificity of aptamers and the good analytical performance of negative ion mode, a selective and sensitive method was developed for the analysis of ATP in complex biological samples.

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Electrocatalysts

A gentle, seedless, and surfactant-free method for the preparation of clean-surface, porous, platinum nanoparticles is described. The as-synthesized nanoparticles show higher activity than a commercial Pt/C catalyst for electrocatalytic methanol oxidation. In addition, an electrochemical method and DFT calculations were utilized to study the inhibition effects of surfactants on the catalytic activity. For more details, see the Full Paper by B. Geng et al. on page 240 ff.

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Ancillary