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48.462 Aktuelle Fachpublikationen zum Thema temperature

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Isolation and Crystal Structure of a Dithiophene Dication: Controlling Covalent Connection and Disconnction with Temperature and Phase

01.10.2015 | Xinping Wang; Ningning Yuan; Zaichao Zhang; Xingyong Wang, Chemical Communication, 2015

A dithienylethene (1o) undergoes a two-electron chemical oxidation to a singlet diradical as an open-isomer (1o2+) in solution, which cyclizes to a closed-form (1c2+) upon cooling. The latter crystallizes out and its structure is analyzed by single crystal X-ray diffraction. Equilibrium between ...


Atmospheric chemistry of (CF3)2C[double bond, length as m-dash]CH2: OH radicals, Cl atoms and O3 rate coefficients, oxidation end-products and IR spectra

01.10.2015 | Vassileios C. Papadimitriou; Christina S. Spitieri; Panos Papagiannakopoulos; Mathieu Cazaunau; Maria Lendar; Véroni ..., Physical Chemistry Chemical Physics, 2015

The rate coefficients for the gas phase reactions of OH radicals, k1, Cl atoms, k2, and O3, k3, with 3,3,3-trifluoro-2(trifluoromethyl)-1-propene ((CF3)2C [[double bond, length as m-dash]] CH2, hexafluoroisobutylene, HFIB) were determined at room temperature and atmospheric pressure employing the ...


Me3N-promoted synthesis of 2,3,4,4a-tetrahydroxanthen-1-one: Preparation of thiosemicarbazone derivatives, their solid state self-assembly and antimicrobial properties

01.10.2015 | Aminah Hameed; Zahid Shafiq; Muhammad Yaqub; Mazhar Hussain; Muhammad A. Hussain; Muhammad Afzal; Muhammad Nawaz Tah ..., New Journal of Chemistry, 2015

A new strategy has been used to synthesize 2,3,4,4a-tetrahydroxanthen-1-one (3) in high yield. Using Me3N-promoted domino Baylis-Hillman/oxa-Michael reaction sequence at room temperature, the reaction of salisaldehyde (1) with cyclohexanone (2) provided 3 in 88% yield, which further undergo ...


A highly active and stable Ni–Mg phyllosilicate nanotubular catalyst for ultrahigh temperature water-gas shift reaction

01.10.2015 | Zhoufeng Bian; Ziwei Li; Jangam Ashok; Sibudjing Kawi, Chemical Communication, 2015

A Ni–Mg phyllosilcate (PS) nanotubular catalyst has been developed by introducing Mg into Ni phyllosilicate nanotubes (PSNTs). The thermal stability is improved significantly. Furthermore, this binary metal PS nanotubular catalyst exhibits excellent activity and stability for ultrahigh ...


Brønsted Acidity of Bio-Protic Ionic Liquids: The Acidic Scale of [AA]X Amino Acid Ionic Liquids

01.10.2015 | Lei Zhang; Ling He; Cheng-Bin Hong; Song Qin; Guo-Hong Tao, Green Chemistry, 2015

Amino acid ionic liquids (AAILs) [AA]X based on amino acid cations are a kind of typical “bio-base” protic ionic liquids (PILs), which are supposed to be acidic ionic liquids. The Brønsted acidity of [AA]X PILs at room temperature were systematically studied for the first time. Acid dissociation ...


An alternative synthesis of the breast cancer drug fulvestrant (Faslodex[registered sign]): catalyst control over C-C bond formation

30.09.2015 | Diego Caprioglio; Stephen P. Fletcher, Chemical Communication, 2015

Fulvestrant (Faslodex®) was synthesized in four steps (35% overall yield) from 6-dehydronandrolone acetate. Catalyst controlled, room temperature, diastereoselective 1,6-addition of the zirconocene derived from commercially available 9-bromonon-1-ene was used in the key C–C bond forming step.


Sequestration and speciation of Eu(III) on gamma alumina: role of temperature and contact order

30.09.2015 | Yawen Cai; Xuemei Ren; Yue Lang; Zhiyong Liu; Pengfei Zong; xiangke wang; Shitong Yang, Journal of Environmental Monitoring, 2015

The speciation, migration and transport of radionuclides in the environment are significantly influenced by their interactions with the natural minerals and humic substances therein. In view of this, the effect of temperature and contact order on the sorption behaviors of trivalent Eu(III) in the ...


Aqueous Foams Stabilized by Temperature-Sensitive Hairy Polymer Particles

30.09.2015 | Saori Nakayama; Shinichi Yusa; Yoshinobu Nakamura; Syuji Fujii, Soft Matter, 2015

Submicrometer-sized polystyrene (PS) particles carrying poly[2-(diethylamino)ethyl methacrylate] (PDEA) hairs (PDEA-PS particles) were synthesized by free radical dispersion polymerization. The hydrophilicity-hydrophobicity balance of the PDEA could be tuned by varying temperature at near neutral ...


Surface texture and physicochemical characterization of mesoporous carbon – wrapped Pd-Fe catalysts for low-temperature CO catalytic oxidation

30.09.2015 | Han Weiliang; Guodong Zhang; Kun Zhao; Gongxuan Lu; Zhicheng Tang, Physical Chemistry Chemical Physics, 2015

In this paper, mesoporous carbon (meso-C) with three-dimensional mesoporous channels had been synthesized through a nanocasting route using three-dimensional mesoporous silica KIT-6 as the template. Mesoporous carbon wrapped Pd-Fe nanocomposite catalysts were synthesized by co-precipitation ...


Influence of gas packing and orientation on FTIR activity for CO chemisorption to the Cu paddlewheel

30.09.2015 | Cheng-Yu Wang; Paramita Ray; Qihan Gong; Yonggang Zhao; Jing Li; Angela D. Lueking, Physical Chemistry Chemical Physics, 2015

In situ Fourier-transform infrared (FTIR) spectroscopy is able to probe structural defects via site-specific adsorption of CO to the Cu-BTC (BTC = 1,3,5-benzenetricarboxylate) metal–organic framework (MOF). The temperature-programmed desorption (TPD) of CO chemisorbed to Cu-TDPAT (TDPAT = ...


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