Materials Literature
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The energy transfer mechanism between an Yb 4f shell and an InP host was investigated, assuming that a nonradiative multiphonon process assists the energy transfer. The values of the energy involved in the energy transfer were determined from the results of optical and electrical experiments. Rate equations were solve…
Abstract Furylfulgides with different sizes of alkyl substituents were synthesized and their photochromic properties were examined. While the quantum yield of coloring reaction increased and the quantum yield of the E-to-Z isomerization decreased as the steric bulkiness of the alkyl substitutent on the 2,5-dimethyl-3-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Spin Molecules: Iron(III) Incorporation into [Mn12O12(O2CMe)16(H2O)4] To Yield [Mn8Fe4O12(O2CMe)16(H2O)4] and Its Influence on the S = 10 Ground State of the FormerAnn R. Schake, Hui-Lien Tsai, Robert J. Webb, Kirsten Folting, George Christou, and David N. HendricksonCi…
Water-soluble, meso-substituted porphyrins are synthesized by sulfonation or methylation of the phenyl or pyridyl groups, respectively, of some non-water-soluble functionalized porphyrins that we have recently synthesized (Can. J. Chem. 72, 1894 (1994)). Twelve anionic sulfonated and seven cationic methylpyridinium po…
(100), (111), and randomly aligned lead zirconate titanate thin films on Pt/Ti/Corning 7059 glass substrates were prepared using a sol-gel method. The thin films, having different alignments, were fabricated by different drying conditions for pyrolysis. The hysteresis loop and the capacitance-voltage characteristics w…
Abstract The morphology and properties of high modulus polypropylenes (PP) are characterized over a wide range of material variables. These variables include the tacticity, room temperature xylene solubles (XSRT), molecular weight, melt flow rate (MFR), and polydispersity index (PI). Flexural modulus in quench‐cooled…
A homologous series of biamphiphilic 1,2Ψω-alkan-tetraols has been synthesized. They form lamellar thermotropic liquid crystalline phases which have been studied by polarizing optical microscopy, as well as by X-ray investigations. Those compounds with a rather long polymethylene chain between the two diol groups exhi…
Persistent and time-resolved transient holes were burnt into the $^{1}\mathrm{D}_{2}$${\ensuremath{\leftarrow}}^{3}$${\mathrm{H}}_{4}$ transition of ${\mathrm{Pr}}^{3+}$ and the $^{5}\mathrm{D}_{0}$${\ensuremath{\leftarrow}}^{7}$${\mathrm{F}}_{0}$ transition of ${\mathrm{Eu}}^{3+}$ in silicate glasses. The holewidths…
With a combination of information from TG/IR and GC/IR measurements of the trapped gases, characterization of complex polymer decompositions can be made. In this paper, the thermally induced breakdown of ethylene-vinyl acetate (EVA) copolymers was studied. Results show that EVA undergoes a two-step decomposition: an a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular-Scale Structure of the Cation Modified Muscovite Mica Basal PlaneS. Nishimura, S. Biggs, P. J. Scales, T. W. Healy, K. Tsunematsu, and T. TateyamaCite this: Langmuir 1994, 10, 12, 4554–4559Publication Date (Print):December 1, 1994Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAutophobic Pinning of Drops of Alkanethiols on GoldHans A. Biebuyck and George M. WhitesidesCite this: Langmuir 1994, 10, 12, 4581–4587Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Distinction between Porphyrins and Tetraazaporphyrins. Insights from X-Ray Photoelectron Spectra of Free Base Porphyrin, Porphyrazine, and Phthalocyanine LigandsAbhik Ghosh, Jeffrey Fitzgerald, Paul G. Gassman, and Jan AlmlofCite this: Inorg. Chem. 1994, 33, 26, 6…
Detailed, ab initio quality electron density calculations are reported for the elements of the tertiary structure of bovine insulin, a protein containing 773 atoms in 51 residues. The high resolution 3D images of the molecular body and tertiary structure elements of insulin are computed using the new Molecular Electro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure and Magnetic Properties of [{Ni2(dpt)2(.mu.-ox)(.mu.-N3)}n](PF6)n: A New Strategy To Obtain S = 1 Alternating ChainsAlbert Escuer, Ramon Vicente, Xavier Solans, and Merce Font-BardiaCite this: Inorg. Chem. 1994, 33, 26, 6007–6011Publication Date (Print):Dec…
A series of new ‘inclusion’ materials based on tetra-4-methoxyphenyl, tetra-4-hydroxyphenyl and tetra-4-chlorophenyl derivatives of the metalloporphyrin system, in combination with a wide variety of guest molecules and ligands, have been prepared, and their structural systematics analysed. Crystallographic investigati…
Excitation of the transition $^{3}$${\mathit{H}}_{4}$${\ensuremath{\rightarrow}}^{1}$${\mathit{D}}_{2}$ in a ${\mathrm{Pr}}^{3+}$-doped fluoroindate glass at \ensuremath{\sim}588 nm results in efficient blue emission at \ensuremath{\sim}480 nm which is ascribed to the $^{3}$${\mathit{P}}_{0}$${\ensuremath{\rightarrow}…
The analysis of gratings of arbitrary depth, profile, and permittivity is conducted by cutting the modulated region into different slices for which the differential theory of gratings is able to compute the diffracted field for both TE and TM polarization without numerical instabilities. The use of a suitable transiti…
A recent method for treating colloid-polymer mixtures is extended to study the phase behaviour of hard-sphere mixtures. It is shown that, for small size ratios ξ r 2 / r 1 , the addition of small spheres (radius r 2 ) to a system of large spheres (radius r 1 ) induces bulk phase separation into coexisting crystal and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Interaction in Metal-Radical Systems: Chloro(meso-tetraphenylporphyrinato)chromium(III)'s and (Hexafluoroacetylacetonato)manganese(II) Ligated with 3- and 4-(N-Oxy-N-tert-butylamino)pyridinesMakoto Kitano, Yoichiro Ishimaru, Katsuya Inoue, Noboru Koga, and Hiizu Iwa…
Single crystals of ${\mathrm{Cs}}_{3}$${\mathrm{Lu}}_{2}$${\mathrm{Br}}_{9}$:1%${\mathrm{Er}}^{3+}$ were grown using the Bridgman technique. The low phonon energy of \ensuremath{\le}190 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ strongly suppresses multiphonon relaxation in this host. For a series of excited states ra…