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644 Aktuelle Fachpublikationen zum Thema temperature

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Direct Evidence for [4+2] Cycloaddition Mechanism of Alkynes to Tantallacyclopentadiene on Dinuclear Tantalum Complexes as a Model of Alkyne Cyclotrimerization

26.06.2015 | Keishi Yamamoto, Hayato Tsurugi, Kazushi Mashima, Chemistry - A European Journal, 2015

Abstract A dinuclear tantalum complex, [Ta2Cl6(μ‐C4Et4)] (2), bearing a tantallacyclopentadiene moiety, was synthesized by treating [(η2‐EtCCEt)TaCl3(DME)] (1) with AlCl3. Complex 2 and its Lewis base adducts, [Ta2Cl6(μ‐C4Et4)L] (L=THF (3 a), pyridine (3 b), THT (3 c)), served as more active ...

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Palladium‐Catalyzed Mono‐α‐arylation of Acetone at Room Temperature

26.06.2015 | Preston M. MacQueen, Alicia J. Chisholm, Breanna K. V. Hargreaves, Mark Stradiotto, Chemistry - A European Journal, 2015

Abstract The first examples of acetone mono‐α‐arylation at room temperature are described, enabled by use of a [Pd(cinnamyl)Cl]2/JosiPhos catalyst system. (Hetero)aryl chloride, bromide, and iodide electrophiles featuring or lacking ortho‐substitution, and comprising a range of functionalities ...

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Anion‐, Solvent‐, Temperature‐, and Mechano‐Responsive Photoluminescence in Gold(I) Diphosphine‐Based Dimers

26.06.2015 | Andrea Deák, Csaba Jobbágy, Gábor Marsi, Miklós Molnár, Zoltán Szakács, Péter Baranyai, Chemistry - A European Journal, 2015

Abstract A series of [Au2(nixantphos)2](X)2 (nixantphos=4,6‐bis(diphenylphosphino)‐phenoxazine; X=NO3, 1; CF3COO, 2; CF3SO3, 3; [Au(CN)2], 4; and BF4, 5) complexes that exhibit intriguing anion‐switchable and stimuli‐responsive luminescent photophysical properties have been synthesized and ...

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Direct On‐Surface Patterning of a Crystalline Laminar Covalent Organic Framework Synthesized at Room Temperature

20.06.2015 | Alejandro de la Peña Ruigómez, David Rodríguez‐San‐Miguel, Kyriakos C. Stylianou, Massimiliano Cavallini, Denis Gent ..., Chemistry - A European Journal, 2015

Abstract We report herein an efficient, fast, and simple synthesis of an imine‐based covalent organic framework (COF) at room temperature (hereafter, RT‐COF‐1). RT‐COF‐1 shows a layered hexagonal structure exhibiting channels, is robust, and is porous to N2 and CO2. The room‐temperature ...

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Fluorescent Dendritic Organogels Based on 2‐(2′‐Hydroxyphenyl)benzoxazole: Emission Enhancement and Multiple Stimuli‐Responsive Properties

19.06.2015 | Hui Chen, Yu Feng, Guo‐Jun Deng, Zhi‐Xiong Liu, Yan‐Mei He, Qing‐Hua Fan, Chemistry - A European Journal, 2015

Abstract A new highly efficient and versatile poly(benzyl ether) dendritic organogelator HPB‐G1 with 2‐(2′‐hydroxyphenyl)benzoxazole (HPB) at the focal point has been designed and synthesized. HPB‐G1 can form stable organogels toward various apolar and polar organic solvents. Further studies ...

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Shape Persistence of Polyproline II Helical Oligoprolines

18.06.2015 | Luca Garbuio, Bartosz Lewandowski, Patrick Wilhelm, Ludmila Ziegler, Maxim Yulikov, Helma Wennemers, Gunnar Jeschke, Chemistry - A European Journal, 2015

Abstract Oligoprolines are commonly used as molecular scaffolds. Past studies on the persistence length of their secondary structure, the polyproline II (PPII) helix, and on the fraction of backbone cis amide bonds have provided conflicting results. We resolved this debate by studying a series ...

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Absolute Asymmetric Synthesis: Viedma Ripening of [Co(bpy)3]2+ and Solvent‐Free Oxidation to [Co(bpy)3]3+

17.06.2015 | Per Martin Björemark, Johan Jönsson, Mikael Håkansson, Chemistry - A European Journal, 2015

Abstract Syntheses of [Co(bpy)3]2+ yield racemic solutions because the Δ‐ and Λ‐enantiomers are stereochemically labile. However, crystallization and attrition‐enhanced deracemization can give homochiral crystal batches of either handedness in quantitative yield. Subsequently, solvent‐free ...

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Synthesis and Characterization of Ba[CoSO]: Magnetic Complexity in the Presence of Chalcogen Ordering

16.06.2015 | Martin Valldor, Ulrich K. Rößler, Yurii Prots, Chang‐Yang Kuo, Jen‐Che Chiang, Zhiwei Hu, Tun‐Wen Pi, Rüdiger Kniep, ..., Chemistry - A European Journal, 2015

Abstract Barium thio‐oxocobaltate(II), Ba[CoS2/2O2/2], was synthesized by the reaction of equimolar amounts of BaO, Co, and S in closed silica ampoules. The title compound (Cmcm, a=3.98808(3), b=12.75518(9), c=6.10697(4) Å) is isostructural to Ba[ZnSO]. The use of soft X‐ray absorption ...

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Hierarchical Porous ZnMn2O4 Hollow Nanotubes with Enhanced Lithium Storage toward Lithium‐Ion Batteries

16.06.2015 | Longhai Zhang, Siqi Zhu, Hui Cao, Linrui Hou, Changzhou Yuan, Chemistry - A European Journal, 2015

Abstract We have purposefully developed a smart template‐engaged methodology to efficiently fabricate well‐defined ternary spinel ZnMn2O4 hollow nanotubes (NTs). The procedure involves coating carbon nanotubes (CNTs) with ZnMn2O4 nanosheets (NSs), followed by heating at high temperature in air ...

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Probing the Diastereoselectivity of Staudinger Reactions Catalyzed by N‐Heterocyclic Carbenes

12.06.2015 | Morgan Hans, Johan Wouters, Albert Demonceau, Lionel Delaude, Chemistry - A European Journal, 2015

Abstract The reaction of ethylphenylketene with 1,3‐dimesitylimidazol‐2‐ylidene (IMes) or 1,3‐dimesitylimidazolin‐2‐ylidene (SIMes) afforded the corresponding azolium enolates in high yields. The two zwitterions were fully characterized by various analytical techniques. Their thermal ...

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