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45.269 Aktuelle Fachpublikationen zum Thema temperature

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Low-Temperature VUV Photoluminescence and Thermoluminescence of UV Excited Afterglow Phosphor Sr3AlxSi1-xO5:Ce3+, Ln3+ (Ln=Er, Nd, Sm, Dy and Tm)

21.05.2015 | Hongde Luo; Adrie Bos; Anna P Dobrowolska; Pieter Dorenbos, Physical Chemistry Chemical Physics, 2015

Low-temperature (10 K) photoluminescence excitation and emission spectra of undoped Sr3SiO5 as well as Ce3+ and Eu3+ single doped Sr3SiO5 have been investigated. It shows the host exciton band and the O2- to Eu3+ charge transfer band at 5.98 eV (207 nm) and 3.87 eV (320 nm) respectively. ...


Structure and magnetic properties of an unusual homoleptic iron(III) thiocyanate dimer

21.05.2015 | Martin Lemaire; Alan J. Lough; Danielle Dinsdale, Dalton Transactions, 2015

We describe the structural and variable temperature magnetic susceptibility properties of an unusual homoleptic bimetallic iron(III) thiocyanate tetraanion. This work represents the first structurally characterized bis(μ-1,3-thiocyanato) dimer of iron(III). A weak antiferromagnetic exchange ...


Inhibitors of thermally induced burn incidents – characterization by microbiological procedure, electrophoresis, SEM, DSC and IR spectroscopy

21.05.2015 | Anna Pielesz; Alicja Machnicka; Andrzej Gawłowski; Janusz Fabia; Ewa Sarna; Włodzimierz Biniaś, Analyst, 2015

Calorimetric (DSC) and Thermogravimetric (TGA) investigations, Acetate Electrophoresis (CAE), Fourier-transform infrared spectrometry (FTIR), Scanning Electron Microscopy analysis (SEM) and Microbiological procedure, were all carried out after heating the samples to a temperature simulating a ...


Visible room-temperature phosphorescence of pure organic crystals via a radical-ion-pair mechanism

20.05.2015 | Shinichi Kuno; Hiroshi Akeno; Hiroyuki Ohtani; Hideya Yuasa, Physical Chemistry Chemical Physics, 2015

The afterglow of phosphorescent compounds can be distinguished from background fluorescence and scattered light by a time-resolved observation, which is a beneficial property for bioimaging. Phosphorescence emission accompanies spin-forbidden transitions from an excited singlet state through an ...


Energy transfer and unusual decay behaviour of BaCa2Si3O9:Eu2+,Mn2+ phosphor

20.05.2015 | Matthias Müller; Thomas Jüstel, Dalton Transactions, 2015

In this work the photoluminescence (PL) of BaCa2Si3O9:Eu2+,Mn2+ and the energy transfer (ET) between Eu2+ and Mn2+ were examined. A series of powder samples with various Mn2+ concentrations were prepared by high temperature solid state route. Phase purity was investigated using X-ray powder ...


Synthesis and Luminescence properties in H2 annealing Mn-doped Y3Al5O12:Ce3+ single crystal for W-LEDs

20.05.2015 | Guorui Gu; Weidong Xiang; Cheng Yang; Xiaojuan Liang, CrystEngComm, 2015

Czochralski grown Mn-doped Y3Al5O12:Ce3+ single crystal was thermally annealed in H2 atmosphere at different temperature for 6 h and the corresponding absorption spectra, emission spectra, quantum yield (QY) and color-electric performance of Ce,Mn:YAG single crystal wafers were investigated ...


Infrared Nonlinear Optical Properties of Lithium-containing Diamond-Like Semiconductors Li2ZnGeSe4 and Li2ZnSnSe4

20.05.2015 | Jian-Han Zhang; Daniel Clark; Jacilynn Brant; Charles Sinagra; Yong Kim; Joon Jang; Jennifer A. Aitken, Dalton Transactions, 2015

Two new lithium-containing diamond-like semiconductors, Li2ZnGeSe4 and Li2ZnSnSe4, have been prepared by high-temperature, solid-state synthesis. Single crystal X-ray diffraction reveals that both compounds adopt the wurtz-kesterite structure type, crystallizing in the noncentrosymmetric space ...


Mild electrophilic trifluoromethylthiolation of ketones with trifluoromethanesulfanamide

20.05.2015 | Wei Wu; Xuxue Zhang; Fang Liang; Song Cao, Organic & Biomolecular Chemistry, 2015

A straightforward and convenient approach for trifluoro-methylthiolation of various acyclic and cyclic ketones with PhNHSCF3 was described. The reaction proceeds smoothly in the presence of acetyl chloride at room temperature and affords α-trifluoromethylthiolated ketones in fair to good yields.


4-(Dimethylamino)pyridine-Catalysed Iodolactonisation of [gamma],[small delta]-Unsaturated Carboxylic Acids

20.05.2015 | Chuisong Meng; Zhihui Liu; Yu-Xiu Liu; Quingmin Wang, Organic & Biomolecular Chemistry, 2015

4-(Dimethylamino)pyridine functioned as an excellent catalyst for iodolactonisation reactions of γ,δ-unsaturated carboxylic acids, affording γ-lactones, δ-lactones, or both under neutral conditions at room temperature. The effects of substrate structure on the iodolactonisation were investigated, ...


Deep Eutectic Solvents: biorenewable reaction media for Au(I)-catalysed cycloisomerisations and one-pot tandem cycloisomerisation/Diels-Alder reactions

20.05.2015 | Joaquin García-Álvarez; Vidal Cristian; Lukas Merz, Green Chemistry, 2015

Cycloisomerisation reactions of (Z)-enynols into furans can be conveniently performed, for the first time, in the eutectic mixture 1ChCl/2Gly as solvent and under standard bench conditions (at room temperature and under air) by using the new bis(iminophosphorane)-Au(I) complex ...


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