Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear and dinuclear ruthenium complexes with triazole containing ligands; fine-tuning of the spectroscopic propertiesRonald Hage, Jaap G. Haasnoot, Jan Reedijk, Renyi Wang, and Johannes G. VosCite this: Inorg. Chem. 1991, 30, 17, 3263–3269Publication Date (Print):Augus…
The Eu3+ and Y3+ complexes of a series of N,N'-bis(carboxymethyl) macrocyclic ether bis(lactone) ligands derived from ethylenediaminetetraacetic acid (EDTA) were characterized in solution by using Eu3+ laser-induced luminescence and 1H and 13CNMR spectroscopy. The complexation of EDTA was also studied for comparison p…
Crystalline \ensuremath{\alpha}-boron consists of ${\mathrm{B}}_{12}$ icosahedra in a rhombohedral lattice of R3\ifmmode\bar\else\textasciimacron\fi{}m space-group symmetry. We here carry out a classical force-field analysis of the lattice vibrations. The q=0 Brillouin-zone vibrations are treated as those of a ${\math…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecular clip with allosteric binding propertiesRint P. Sijbesma and Roeland J. M. NolteCite this: J. Am. Chem. Soc. 1991, 113, 17, 6695–6696Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.ac…
The third-order optical susceptibilities χ 1111 (3) (-3ω; ω, ω, ω) s f o r t w o d i f f e r e n t p h a s e s i n v a n a d y l a n d t i t a n y l p h t h a l o c y a n i n e ( V O P c a n d T i O P c ) v a c u u m - d e p o s i t e d t h i n f i l m s a r e d e t e r m i n e d b y o p t i c a l t h i r d - h a r m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and NMR study of the spin-crossover transition in bis(4,4'-bi-1,2,4-triazole)bis(thiocyanato)iron hydrate and bis(4,4'-bi-1,2,4-triazole)bis(selenocyanato)iron hydrate. X-ray structure determination of Fe(4,4'-bi-1,2,4-triazole)2(SeCN)2.cntdot.H2OAndrzej Ozarowski, Yu Sh…
A novel compound formed by copper(II) and a nitronyl nitroxide radical of formula [Cu(hfac)2]3(NITpPy)2 (where hfac = hexafluoroacetylacetonato and NITpPy = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide) was synthesized. It crystallizes in the monoclinic system, space group C2/c, with a 36.540 (9) angstr…
Abstract A new dispersion/flocculation phase transition model for the conductivity jump at the critical volume concentration of a conductive phase in an insulating matrix polymer is discussed. New experimental‐data including: SEM evaluations of the “seam” structure, excess pyrolytic residue analysis, BET measurements…
Both the kinetics and the microstructure of monolithic hydroxyapatite formed by a low‐temperature dissolution and precipitation reaction strongly depend on the conditions in solution during the reaction. The relationships between the molar ratio of the particulate reactants (dicalcium phosphate and tetracalcium phosph…
This paper describes the operation and performance of an atomic-oxygen (AO) beam facility developed at the University of Toronto Institute for Aerospace Studies (UTIAS), capable of providing ground-state neutral oxygen atoms at ~ 2.2 eV for flux levels as high as ~ 10 16 atoms (cm 2 s) −1 . Results are presented on th…
Four organic coatings of commercial grade (polyurethane, epoxy-polyamide, medium-quality and low-cost alkyds) with an expected range of corrosion protective properties were applied to steel substrates and immersed for up to 4,300 h in 0.6 M NaCl solution. These painted electrodes were assessed by AC impedance in the f…
The tetragonal tungsten bronze (TTB) type of Sr x Ba 1− x m Nb 2 O 6 (SBN) (0.5 ≤ x ≤ 0.75) was synthesized by a mixed‐oxide route. Using the two‐step densification process of pressureless sintering followed by oxygen HIPing, transparent ceramics were successfully fabricated. Microstructural, dielectric, optical, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of hydroxyapatite on polymersEvangelos Dalas, Jannis K. Kallitsis, and Petros G. KoutsoukosCite this: Langmuir 1991, 7, 8, 1822–1826Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pub…
The induction of a nematic columnar phase in a discotic hexagonal ordered phase forming system is achieved by mixing hexakispentyloxytriphenylene 1 with a long chain derivative of trinitrofluorenone 3. The difference in chain length has a strong influence on the packing behaviour due to steric effects. The long hydroc…
Two large pentakis(phenylethynyl)phenyl alkyl ethers, without side chains as is usual for discotic systems, were synthesized in palladium catalysed one pot coupling reactions. These low molecular weight and non-liquid-crystalline electron donor compounds were doped with 2,4,7-trinitrofluorenone under the formation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple bonds between main-group elements and transition metals. 86. Methyltrioxorhenium(VII) and trioxo(.eta.5-pentamethylcyclopentadienyl)rhenium(VII): structures, spectroscopy and electrochemistryWolfgang A. Herrmann, Paul Kiprof, Kristin Rypdal, Janos Tremmel, Richard B…
Strong photoluminescence with sub-band-gap photon energies has been observed in fine Si particles prepared by the gas-evaporation technique. After surface oxidation, the Si particles show above-band-gap photoluminescence, the band tail covering the visible light region. The amount of the increased apparent band gap (0…
A novel epitaxial growth method of SrTiO 3 films on Si(100) substrates is presented in which, in order to reduce the surface oxide layers of the substrates, thin Sr layers are deposited prior to deposition of SrTiO 3 films. It has been shown that the film composition becomes nearly stoichiometric when single-crystalli…
Quantitative x-ray-diffraction measurements of ultrafine-grained (nanocrystalline) Pd samples and a coarse-grained polycrystalline reference foil were obtained using synchrotron radiation. The intensity profiles of the Bragg reflections from the nanocrystalline samples were considerably better represented by Lorentzia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of a molecular-based ferromagnet through polymerization reaction in the solid state of manganeseII copperII molecular units. Crystal structure of MnCu(obze)(H2O)4.cntdot.2H2O (obze = oxamido-N-benzoato-N'-ethanoato)Yu Pei, Olivier Kahn, Keitaro Nakatani, Epiphane Codj…