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482 Aktuelle Fachpublikationen zum Thema temperature

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Carcinogenic Organic Residual Compounds Readsorbed on Thermally Reduced Graphene Materials are Released at Low Temperature

05.09.2013 | Adriano Ambrosi, Gwendeline K. S. Wong, Richard D. Webster, Zdeněk Sofer, Martin Pumera, Chemistry - A European Journal, 2013

Abstract The preliminary oxidation of graphite to graphite oxide followed by a thermal exfoliation is one of the methods most frequently employed in the preparation of graphene. Such thermally reduced graphene can be widely used for several applications that range from coatings to sensing ...

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Photoreaction of rac‐Leucine in Ice by Circularly Polarized Synchrotron Radiation: Temperature‐Induced Mechanism Switching from Norrish Type II to Deamination

28.08.2013 | Hideo Nishino, Masahito Hosaka, Masahiro Katoh, Yoshihisa Inoue, Chemistry - A European Journal, 2013

Abstract The delivery of extraterrestrial organics to primitive Earth is considered to have triggered the origin and subsequent evolution of life. Indeed, enantiomerically enriched amino acids of nonterrestrial origin have been found in carbonaceous meteorites, and enantioselective ...

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Formation and Dynamic Behavior of Mono and Bimetallic Cadmium(II) Porphyrin Complexes: Allosteric Control of Coupled Intraligand Metal Migrations

23.08.2013 | Stéphane Le Gac, Luca Fusaro, Vincent Dorcet, Bernard Boitrel, Chemistry - A European Journal, 2013

Abstract The complexation behavior of a bis‐strapped porphyrin ligand (1) towards CdII has been investigated by 1H and 113Cd NMR spectroscopy with the help of X‐ray diffraction structures. The presence of an overhanging carboxylic acid group on each side of the macrocycle is responsible for ...

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Long‐Lived Radical Cation Salts Obtained by Interaction of Monocyclic Arenes with Niobium and Tantalum Pentahalides at Room Temperature: EPR and DFT Studies

20.08.2013 | Fabio Marchetti, Guido Pampaloni, Calogero Pinzino, Chemistry - A European Journal, 2013

Abstract The 1:3 reactions of the alkoxy arenes 1,4‐(MeO)2C6H4 and 1,4‐F2‐2,5‐(MeO)2C6H2 with TaF5 in chloroform at 40–50 °C resulted in formation in about 35 % yield of the long‐lived radical cation salts [1,4‐(MeO)2C6H4][Ta2F11] (2 a) and [1,4‐F2‐2,5‐(MeO)2C6H2][Ta2F11] (2 b), respectively. ...

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Charge‐Recombination Fluorescence from Push–Pull Electronic Systems Constructed around Amino‐Substituted Styryl–BODIPY Dyes

15.08.2013 | Adela Nano, Raymond Ziessel, Patrycya Stachelek, Anthony Harriman, Chemistry - A European Journal, 2013

Abstract A small series of donor–acceptor molecular dyads has been synthesized and fully characterized. In each case, the acceptor is a dicyanovinyl unit and the donor is a boron dipyrromethene (BODIPY) dye equipped with a single styryl arm bearing a terminal amino group. In the absence of the ...

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Tunable Emissive Lanthanidomesogen Derived from a Room‐Temperature Liquid‐Crystalline Schiff‐Base Ligand

12.08.2013 | Harun. A. R. Pramanik, Gobinda Das, Chira R. Bhattacharjee, Pradip C. Paul, Paritosh Mondal, S. Krishna Prasad, D. S ..., Chemistry - A European Journal, 2013

Abstract A novel photoluminescent room‐temperature liquid‐crystalline salicylaldimine Schiff base with a short alkoxy substituent and a series of lanthanide(III) complexes of the type [Ln(LH)3(NO3)3] (Ln=La, Pr, Sm, Gd, Tb, Dy; LH=(E)‐5‐(hexyloxy)‐2‐ ...

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Regioselectivity and Competition of the Paternò–Büchi Reaction and Triplet–Triplet Energy Transfer between Triplet Benzophenones and Pyrimidines: Control by Triplet Energy Levels

12.08.2013 | Xiu‐Ling Liu, Jian‐Bo Wang, Yao Tong, Qin‐Hua Song, Chemistry - A European Journal, 2013

Abstract The photochemical reaction of a pyrimidine and a ketone occurs either as a Paternò–Büchi (PB) reaction or as energy transfer (ET) from the triplet ketone to the pyrimidine. It is rare for the two types of reactions to occur concurrently, and their competitive mechanism remains ...

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Cyclometalation of Aryl‐Substituted Phosphinines through CH‐Bond Activation: A Mechanistic Investigation

09.08.2013 | Leen E. E. Broeckx, Sabriye Güven, Frank J. L. Heutz, Martin Lutz, Dieter Vogt, Christian Müller, Chemistry - A European Journal, 2013

Abstract A series of 2,4,6‐triarylphosphinines were prepared and investigated in the base‐assisted cyclometalation reaction using [Cp*IrCl2]2 (Cp*=1,2,3,4,5‐pentamethylcyclopentadienyl) as the metal precursor. Insight in the mechanism of the CH bond activation of phosphinines as well as in ...

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Influence of Perfluorinated End Groups on the SFRD of [Pt(cod)Me(CnF2n+1)] onto Porous Al2O3 in CO2 under Reductive Conditions

05.08.2013 | Vikas Aggarwal, Linus F. Reichenbach, Mirja Enders, Thierry Muller, Simone Wolff, Marlene Crone, Michael Türk, Stefa ..., Chemistry - A European Journal, 2013

Abstract The optimized synthesis of a range of cyclooctadiene‐stabilized Pt complexes that contained different perfluoro‐alkane chains, [Pt(cod)Me(CnF2n+1)], is presented. These metal–organic compounds were employed in the so‐called supercritical fluid reactive deposition (SFRD) in CO2 under ...

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Physical Properties of Superbulky Lanthanide Metallocenes: Synthesis and Extraordinary Luminescence of [EuII(CpBIG)2] (CpBIG=(4‐nBu‐C6H4)5‐Cyclopentadienyl)

31.07.2013 | Sjoerd Harder, Dominik Naglav, Christian Ruspic, Claudia Wickleder, Matthias Adlung, Wilfried Hermes, Matthias Eul, ..., Chemistry - A European Journal, 2013

Abstract The superbulky deca‐aryleuropocene [Eu(CpBIG)2], CpBIG=(4‐nBu‐C6H4)5‐cyclopentadienyl, was prepared by reaction of [Eu(dmat)2(thf)2], DMAT=2‐Me2N‐α‐Me3Si‐benzyl, with two equivalents of CpBIGH. Recrystallizyation from cold hexane gave the product with a surprisingly bright and ...

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