EFFECTS OF Mo CONTENT ON THE MICROSTRUCTURE AND FRICTION AND WEAR PROPERTIES OF TiMoN FILMS
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Living radical polymerization of acrylates and acrylamides mediated by a versatile cobalt porphyrin complex
Living radical polymerization (LRP) of organic and water soluble acrylates and acrylamides was mediated by a versatile cobalt porphyrin complex (TMP-OH)Co. The capability of this cobalt complex to mediate LRP in both polar and non-polar media permits the direct synthesis of useful and previously difficult to prepare f…
Effects of alkyl chain length and anion size on thermal and structural properties for 1-alkyl-3-methylimidazolium hexafluorocomplex salts (CxMImAF6, x = 14, 16 and 18; A = P, As, Sb, Nb and Ta)
A series of 1-alkyl-3-methylimidazolium hexafluorocomplex salts (C(x)MImAF(6), x = 14, 16 and 18, A = P, As, Sb, Nb and Ta) have been characterized by thermal analysis, X-ray diffraction and polarized optical microscopy. A liquid crystalline mesophase is observed for all the C(16)MIm and C(18)MIm salts. The C(14)MIm(+…
Supramolecular architectures based on various macrocyclic metallic tectons with 1,3,5-triazine-2,4,6-triamine hexaacetic acid ligand
Reactions of series of macrocycle derivatives [Ni(hto)]Cl2·2H2O (1) (hto = 1,3,6,9,11,14-hexaazatri-cyclo[12.2.1.16,9]octadecane), [Ni(CHA)](ClO4)2 (2) (CHA = 1,3,6,8,11,14-hexaazatri-cyclo[12.2.1.18,11]octadecane), [Ni(PCHA)](ClO4)2 (3) and [Cu(PCHA)](ClO4)2 (4) (PCHA = 4-methyl-1,3,6,8,11,14-hexaazatri-cyclo[12.2.1.…
Design and synthesis of anthracene-based bispyridinium amides: anion binding, cell staining and DNA interaction studies
The design and synthesis of anthracene labeled bispyridinium amides 1–4 along with their anion binding, cell staining and DNA interaction studies are reported. All the chemosensors exhibit significant response towards H2PO4− in CH3CN. Furthermore, sensors 2 and 3 are quite interesting for the selective sensing of alip…
Solvent-induced syntheses of 2D/3D [AgSCN]n-based supramolecular isomers with unusual topologies: structural, theoretical and nonlinear optical studies
Reactions of hexamethylenetetramine (hmt) and AgSCN in different solvents generated three distinct [AgSCN]n-based coordination polymers (CPs): [Ag(1,3-μ2-SCN)(μ2-hmt)]n (1), {[Ag(1,1,3-μ3-SCN)]2(μ2-hmt)}n (2) and [Ag(1,1,3-μ3-SCN)(μ4-hmt)0.5]n (3). The identities of the coordination polymers (CPs) 1–3 have been unambi…
The emission enhancement of the NIR distyryl Bodipy dyes by the indirect S0 → S2 excitation and their application towards a Hg2+ probe
A new strategy for enhancing the brightness of the NIR distyryl Bodipy derivatives was proposed based on the indirect S0 → S2 excitation, and applied to fluorescence turn-on detection of Hg2+, by which the marked fluorescence enhancement (2.5-fold) and the high sensitivity for Hg2+ (up to 3 ppb) could be realized.
Mesogen-jacketed liquid crystalline polymers: from molecular design to polymer light-emitting diode applications
This critical review covers the recent progress in the chemical structure design and light-emitting performance evaluation of electroluminescent mesogen-jacketed liquid crystalline polymers (MJLCPs). By applying the concept of MJLCPs, two main chromophoric building units, electron-transporting and hole-transporting un…
Project presentation: Design and installation of advanced high pressure alkaline electrolyzer-prototypes
Within the framework of the joint research project, “Production of hydrogen from renewable energy sources” an approach for the temporal storage of excess wind energy and the grid integration of renewable energies is being researched at the BTU Cottbus in cooperation with ENERTRAG AG. The Hydrogen Research Center Cottb…
The effect of the axial ligand on distinct reaction tunneling for methane hydroxylation by nonheme iron(iv)–oxo complexes
Comprehensive density functional theory computations on substrate hydroxylation by a range of nonheme iron(IV)-oxo model systems [Fe(IV)(O)(NH(3))(4)L](+) (where L = CF(3)CO(2)(-), F(-), Cl(-), N(3)(-), NCS(-), NC(-), OH(-)) have been investigated to establish the effects of axial ligands with different degrees of ele…
Improvement in the power conversion efficiency of thiocyanate-free Ru(ii) based dye sensitized solar cells by cosensitization with a metal-free dye
We have used a stepwise approach for cosensitization of a thiocyanate-free Ru(II) sensitizer with an organic dye (TDPP) for dye sensitized solar cells. The cosensitized SPS-01 + TDPP device showed enhanced Voc and Jsc relative to the individual dye sensitized solar cells. Upon the optimization, the device made of SPS-…
A Novel Polarization-Independent, Free-Space, Microwave Beam Splitter Utilizing an Inkjet-Printed, 2-D Array Frequency Selective Surface
This letter introduces the first beam splitter that acts on free-space, planar, microwave frequency waves below 80 GHz. The design utilizes a frequency selective surface (FSS) operating away from its normal frequency of operation. The FSS is constructed from an array of scalable printed patterns, which allows for the…
Novel Ultra-Cryo Milling and Co-grinding Technique in Liquid Nitrogen to Produce Dissolution-Enhanced Nanoparticles for Poorly Water-Soluble Drugs
A novel ultra-cryo milling micronization technique for pharmaceutical powders using liquid nitrogen (LN2 milling) was used to grind phenytoin, a poorly water-soluble drug, to improve its dissolution rate. LN2 milling produced particles that were much finer and more uniform in size and shape than particles produced by…
Calf thymus DNA-stabilized polythiophene fluorescence probe for label-free detection of spermine
It is a challenge to detect molecules lacking a chromophore, such as polyamines, by optical methods since they are insensitive to light. In order to detect the optical signals, it is compulsory to derive these molecules with optical labels, which, however, is complicated, time-consuming and may be expensive. In this w…
Physical Properties of Nano-crystalline SnS2 Layers Grown by Chemical Bath Deposition
Tin disulphide (SnS2) nano-crystalline films were deposited on glass substrates by chemical bath deposition using tin chloride (SnCl2) and thioacetimide (C2H5NS) as the precursors with triethanolamine and ammonia (NH4) as the complexing agents at a bath temperature of 60oC. The layers were grown by varying the volume…
Flavin as a photo-active acceptor for efficient energy and charge transfer in a model donor–acceptor system
A donor-acceptor dyad model system using a flavin moiety as a photo-active acceptor has been synthesized for an energy and photo-induced electron transfer study. The photophysical investigations of the dyad revealed a multi-path energy and electron transfer process with a very high transfer efficiency. The photo-activ…
Ionic liquid-in-ionic liquid nanoemulsions
A new type of nanoemulsion formed by two immiscible ionic liquids was prepared for the first time. This novel kind of emulsion involves no volatile organic solvent. Metal-organic framework nanorods with large mesopores were synthesized in the nanoemulsion.
Template free synthesis of crystallized nanoporous F-Ta2O5 spheres for effective photocatalytic hydrogen production
Crystallized and fluorinated nanoporous Ta(2)O(5) spheres were prepared by a combination of co-precipitation and hydrothermal methods in a NH(4)F-containing water solution. The as-prepared porous spheres, with a pore-size of around 7 nm and a large specific surface area of 132 m(2) g(-1), show superior photocatalytic…
pH- and Temperature-Responsive P(DMAEMA-GMA)-Alginate Semi-IPN Hydrogels Formed by Radical and Ring-Opening Polymerization for Aminophylline Release
A novel poly((2-dimethylamino) ethyl methacrylate-glycidyl methacrylate)-alginate (P(DMAEMA-GMA)alginate) semi-IPN hydrogel was synthesized via radical polymerization of the double bonds and ring-opening of the epoxy groups without using catalyst and cross-linker. (1)H-NMR, FT-IR and DSC data were consistent with the…
Metal salts of the 4,5-dicyano-2H-1,2,3-triazole anion ([C4N5]−)
Diaminomaleodinitrile was reacted at low temperatures with in situ generated nitrous acid to form 4,5-dicyano-2H-1,2,3-triazole (1) in yields above 90%. Crystalline 1 was then reacted with one equivalent of a suitable alkali or alkaline earth metal base (typically a hydroxide or a carbonate) in a polar solvent to form…