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756 Aktuelle Fachpublikationen zum Thema temperature

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Capturing Transient Endoperoxide in the Singlet Oxygen Oxidation of Guanine

27.01.2016 | Wenchao Lu, Jianbo Liu, Chemistry - A European Journal, 2016

Abstract The chemistry of singlet O2 toward the guanine base of DNA is highly relevant to DNA lesion, mutation, cell death, and pathological conditions. This oxidative damage is initiated by the formation of a transient endoperoxide through the Diels–Alder cycloaddition of singlet O2 to the ...

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General Assembly of Twisted Trigonal‐Prismatic Nonanuclear Silver(I) Clusters

25.01.2016 | Xiao‐Yu Li, Hai‐Feng Su, Rui‐Qi Zhou, Sheng Feng, Yuan‐Zhi Tan, Xing‐Po Wang, Jiong Jia, Mohamedally Kurmoo, Di Sun, ..., Chemistry - A European Journal, 2016

Abstract A general class of C3‐symmetric Ag9 clusters, [Ag9S(tBuC6H4S)6(dpph)3(CF3SO3)] (1), [Ag9(tBuC6H4S)6(dpph)3(CF3SO3)2]⋅CF3SO3 (2), [Ag9(tBuC6H4S)6(dpph)3(NO3)2] ⋅NO3 (3), and [Ag9(tBuC6H4S)7(dpph)3(Mo2O7)0.5]2⋅2 CF3COO (4) (dpph=1,6‐bis(diphenylphosphino)hexane), with a twisted ...

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Highly Efficient Visible‐to‐NIR Luminescence of Lanthanide(III) Complexes with Zwitterionic Ligands Bearing Charge‐Transfer Character: Beyond Triplet Sensitization

19.01.2016 | Mei Pan, Bin‐Bin Du, Yi‐Xuan Zhu, Mei‐Qin Yue, Zhang‐Wen Wei, Cheng‐Yong Su, Chemistry - A European Journal, 2016

Abstract Two zwitterionic‐type ligands featuring π–π* and intraligand charge‐transfer (ILCT) excited states, namely 1,1′‐(2,3,5,6‐tetramethyl‐1,4‐phenylene)bis(methylene)dipyridinium‐4‐olate (TMPBPO) and 1‐dodecylpyridin‐4(1 H)‐one (DOPO), have been prepared and applied to the assembly of ...

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Homo‐ and Heterodinuclear Ir and Rh Imine‐functionalized Protic NHC Complexes: Synthetic, Structural Studies, and Tautomerization/Metallotropism Insights

15.01.2016 | Fan He, Marcel Wesolek, Andreas A. Danopoulos, Pierre Braunstein, Chemistry - A European Journal, 2016

Abstract The influence of the potentially chelating imino group of imine‐functionalized Ir and Rh imidazole complexes on the formation of functionalized protic N‐heterocyclic carbene (pNHC) complexes by tautomerization/metallotropism sequences was investigated. Chloride abstraction in ...

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Transition‐Metal‐Mediated Cleavage of Fluoro‐Silanes under Mild Conditions

14.01.2016 | Hajime Kameo, Tatsuya Kawamoto, Shigeyoshi Sakaki, Didier Bourissou, Hiroshi Nakazawa, Chemistry - A European Journal, 2016

Abstract SiF bond cleavage of fluoro‐silanes was achieved by transition‐metal complexes under mild and neutral conditions. The Iridium‐hydride complex [Ir(H)(CO)(PPh3)3] was found to readily break the SiF bond of the diphosphine‐ difluorosilane {(o‐Ph2P)C6H4}2Si(F)2 to afford a silyl complex ...

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Magnetic and Electrochemical Properties of a TEMPO‐Substituted Disulfide Diradical in Solution, in the Crystal, and on a Surface

07.01.2016 | Vega Lloveras, Elena Badetti, Klaus Wurst, Victor Chechik, Jaume Veciana, José Vidal‐Gancedo, Chemistry - A European Journal, 2016

Abstract A study of the magnetic and electrochemical properties of a TEMPO‐substituted disulfide diradical in three different environments was carried out: in solution, in the crystal, and as a self‐assembled monolayer (SAM) on an Au(111) substrate, and the relationship between them was ...

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Synthesis of Cyclic Carbonates Catalysed by Chromium and Aluminium Salphen Complexes

07.01.2016 | José A. Castro‐Osma, Michael North, Xiao Wu, Chemistry - A European Journal, 2016

Abstract Chromium and aluminium salphen complexes have been found to display remarkable catalytic activity in the synthesis of cyclic carbonates from a range of epoxides and carbon dioxide. The Al(salphen) complex is more reactive towards terminal epoxides at ambient temperature and pressure, ...

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Isolable Boron Persulfide. Activation of Elemental Sulfur with a 2‐Chloro‐Azaborolyl Anion

30.12.2015 | Chunming Cui, Chemistry - A European Journal, 2015

The novel boron persulfide 2 LB(2‐S2) (L = [ArNC(R)CHC(R)]‐; Ar = 2,6‐Me2C6H3, R = t‐Bu) was obtained via reaction of the 2‐chloro‐azaborolyl anion 1 (LBCl)K(THF) with 0.25 equivalents of elemental sulfur (S8). Persulfide 2 is labile in solution and could be converted to the cyclic tetrasulfide ...

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Auto‐Oxidation‐Aldol Tandem Reaction of 2‐Oxindoles with Ketones: A Green Approach for the Synthesis of 3‐Hydroxy‐2‐Oxindoles

30.12.2015 | Qiang Liu, Qing-Bao Zhang, Wen-Liang Jia, Yong-Liang Ban, Yong Zheng, Li-Zhu Wu, Chemistry - A European Journal, 2015

In the presence of tetra‐butylammonium fluoride and molecular sieve (MS) 4Å in DMF, an efficient auto‐oxidation reaction of 2‐oxindoles with ketones under air at room temperature has been developed. This approach may provide a green, practical, and metal‐free protocol for a wide range of ...

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Diacetylenes with Ionic‐Liquid‐Like Substituents: Associating a Polymerizing Cation with a Polymerizing Anion in a Single Precursor for the Synthesis of N‐Doped Carbon Materials

23.12.2015 | Karim Fahsi, Xavier Dumail, Sylvain G. Dutremez, Arie van der Lee, André Vioux, Lydie Viau , Chemistry - A European Journal, 2015

Abstract Imidazolium‐ and benzimidazolium‐substituted diacetylenes with bromide or nitrogen‐rich dicyanamide and tricyanomethanide anions were synthesized and used as precursors for the preparation of N‐doped carbon materials. On pyrolysis under argon at 800 °C both halide precursors afforded ...

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