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700 Aktuelle Fachpublikationen zum Thema temperature

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Design, Synthesis, and Conformational Analysis of a Proposed β‐Turn Mimics from Isoxazoline‐Cyclopentane Aminols

29.09.2015 | Misal Giuseppe Memeo, Mariella Mella, Valentina Montagna, Paolo Quadrelli, Chemistry - A European Journal, 2015

Abstract Constrained aminols from oxazanorbornene derivatives have the geometrical features to be used as β‐turn inducers. Four different stereoisomers were prepared and spectroscopically characterized (MD calculations, NMR‐titration and VT‐NMR experiments). Temperature coefficients in DMSO ...


A Cationic MOF with High Uptake and Selectivity for CO2 due to Multiple CO2‐Philic Sites

29.09.2015 | Hai‐Hua Wang, Wen‐Juan Shi, Lei Hou, Gao‐Peng Li, Zhonghua Zhu, Yao‐Yu Wang, Chemistry - A European Journal, 2015

Abstract The reaction of N‐rich pyrazinyl triazolyl carboxyl ligand 3‐(4‐carboxylbenzene)‐5‐(2‐pyrazinyl)‐1H‐1,2,4‐triazole (H2cbptz) with MnCl2 afforded 3D cationic metal–organic framework (MOF) [Mn2(Hcbptz)2(Cl)(H2O)]Cl⋅DMF⋅0.5 CH3CN (1), which has an unusual (3,4)‐connected 3,4T1 topology ...


Thermochromism of CuI Tetrakisguanidine Complexes: Reversible Activation of Metal‐to‐Ligand Charge‐Transfer Bands

29.09.2015 | Sven Wiesner, Arne Wagner, Olaf Hübner, Elisabeth Kaifer, Hans‐Jörg Himmel, Chemistry - A European Journal, 2015

Abstract Tetranuclear, intensely blue‐coloured CuI complexes were synthesised in which two Cu2X3− units (X=Br or I) are bridged by a dicationic GFA (guanidino‐functionalised aromatic) ligand. The UV/Vis spectra show a large metal‐to‐ligand charge‐transfer (MLCT) band around 638 nm. The ...


A Programmed DNA Marker Based on Bis(4‐ethynyl‐1,8‐naphthalimide) and Three‐Methane‐Bridged Thiazole Orange

29.09.2015 | Yueyuan Mao, Keyin Liu, Liang Chen, Xinhua Cao, Tao Yi, Chemistry - A European Journal, 2015

Abstract Two large conjugated naphthalimide derivatives with or without three‐methane‐bridged thiazole orange (TO3; i.e., compounds 1 a and 2 a, respectively) were designed and synthesized. The fluorescence of the naphthalimide group in compound 1 a at λ=532 nm initially decreased and that for ...


Mechanistic Study of a Photocatalyzed CS Bond Formation Involving Alkyl/Aryl Thiosulfate

25.09.2015 | Yiming Li, Weisi Xie, Xuefeng Jiang, Chemistry - A European Journal, 2015

Abstract This study presents thioether construction involving alkyl/aryl thiosulfates and diazonium salt catalyzed by visible‐light‐excited [Ru(bpy)3Cl2] at room temperature in 44–86 % yield. Electron paramagnetic resonance studies found that thiosulfate radical formation was promoted by ...


Frontispiece: Monitoring and Understanding the Paraelectric–Ferroelectric Phase Transition in the Metal–Organic Framework [NH4][M(HCOO)3] by Solid‐State NMR Spectroscopy

23.09.2015 | Jun Xu , Bryan E. G. Lucier , Regina Sinelnikov, Victor V. Terskikh, Viktor N. Staroverov, Yining Huang, Chemistry - A European Journal, 2015

Solid‐State NMR Spectroscopy The [NH4][M(HCOO)3] (M=Mg, Zn) metal–organic framework (MOF) undergoes a paraelectric/ferroelectric phase transition below room temperature. In situ variable temperature 25Mg, 67Zn, 14N, and 13C solid‐state NMR (SSNMR) experiments permit detailed investigation of ...


Reversible Guest Binding in a Non‐Porous FeII Coordination Polymer Host Toggles Spin Crossover

23.09.2015 | Anders Lennartson, Peter Southon, Natasha F. Sciortino, Cameron J. Kepert, Cathrine Frandsen, Steen Mørup, Stergios ..., Chemistry - A European Journal, 2015

Abstract Formation of either a dimetallic compound or a 1 D coordination polymer of adiponitrile adducts of [Fe(bpte)]2+ (bpte=[1,2‐bis(pyridin‐2‐ylmethyl)thio]ethane) can be controlled by the choice of counteranion. The iron(II) atoms of the bis(adiponitrile)‐bridged dimeric complex ...


Ruthenium(II)‐Catalyzed CH Functionalizations with Allenes: Versatile Allenylations and Allylations

17.09.2015 | Sachiyo Nakanowatari, Lutz Ackermann, Chemistry - A European Journal, 2015

Abstract Ruthenium(II)‐catalyzed direct CH functionalization of aromatic compounds with allenes was achieved under exceedingly mild reaction conditions to yield trisubstituted allenes. The reactions of N‐methoxybenzamides proceeded smoothly in an isohypsic fashion at ambient temperature with ...


Synthesizing Ag Nanoparticles of Small Size on Hierarchical Porosity Support for Carboxylative Cyclization of Propargyl Alcohols with CO2 under Ambient Conditions

14.09.2015 | Meng Cui, Qingli Qian, Zhenhong He, Jun Ma, Xinchen Kang, Jiayin Hu, Zhimin Liu, Buxing Han, Chemistry - A European Journal, 2015

Abstract Both immobilization of Ag nanoparticles (AgNPs) of very small size on hierarchical porosity supports and carboxylative cyclization of propargyl alcohols with CO2 under ambient conditions are very interesting. In this work, we synthesized AgNPs supported on sulfonated macroreticular ...


Magnesium(I) Dimers Bearing Tripodal Diimine–Enolate Ligands: Proficient Reagents for the Controlled Reductive Activation of CO2 and SO2

11.09.2015 | Aaron J. Boutland, Indrek Pernik, Andreas Stasch, Cameron Jones, Chemistry - A European Journal, 2015

Abstract The first examples of magnesium(I) dimers bearing tripodal ligands, [(Mg{κ3‐N,N′,O‐(ArNCMe)2(OCCPh2)CH})2] [Ar=2,6‐iPr2C6H3 (Dip) 7, 2,6‐Et2C6H3 (Dep) 8, or mesityl (Mes) 9] have been prepared by post‐synthetic modification of the β‐diketiminato ligands of previously reported ...


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