Materials Literature
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Recent structural studies of the undoped and iodine-doped polyacetylenes (prepared by the Tsukamoto and co-workers method), PF6−-doped polypyrrole and polyaniline emeraldine base and (hydrochloric acid and camphorsulfonic acid) salts are presented. Some key features of the polymer chain array and its evolution with th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Two-Dimensional EXSY Spectroscopy and Dynamic Behavior of a Paramagnetic Lanthanide Macrocyclic Chelate: YbDOTA(DOTA = 1,4,7,10-Tetraazacyclododecane-N,N',N'',N'''-tetraacetic Acid)Vincent Jacques and Jean F. DesreuxCite this: Inorg. Chem. 1994, 33, 18, 4048–405…
Irradiation of ketoprofen in neutral aqueous medium gave rise to 3-ethylbenzophenone as the major photoproduct. Its formation is justified via protonation of a benzylic carbanion or hydrogen abstraction by a benzylic radical. Minor amounts of eight additional compounds were isolated. Four of them are derived from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAxial Ligand Orientation in Iron(III) Porphyrinates: Effect of Axial .pi.-Acceptors. Characterization of the Low-Spin Complex [Fe(TPP)(4-CNPy)2]ClO4Martin K. Safo, F. Ann Walker, Arnold M. Raitsimring, W. Patrick Walters, Daniel P. Dolata, Peter G. Debrunner, and W. Robert S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitization of Quantum-Size TiO2 Particles in Water-in-Oil MicroemulsionsErnesto Joselevich and Itamar WillnerCite this: J. Phys. Chem. 1994, 98, 31, 7628–7635Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 Augu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Water-Soluble Self-Acid-Doped PolyanilineShow-An Chen and Gue-Wuu HwangCite this: J. Am. Chem. Soc. 1994, 116, 17, 7939–7940Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org/d…
The dispersion relation of photons transmitting through a photonic one-dimensional quasicrystal arranged in a Fibonacci sequence was observed by measuring the spectrum of the phase change of the transmitted light using a Michelson-type interferometer. The phase spectrum obtained clearly showed the self-similar structu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Preparation and Analytical Applications of Ultrathin Overoxidized Polypyrrole FilmsChenChan. Hsueh and Anna. Brajter-TothCite this: Anal. Chem. 1994, 66, 15, 2458–2464Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Publish…
The in-plane thermal conductivity ${\mathrm{\ensuremath{\kappa}}}_{\mathrm{\ensuremath{\parallel}}}$ has been measured over the temperature range 5--400 K for samples of chemical-vapor-deposited (CVD) diamond made by both the microwave and hot-filament processes. The samples span a range of defect level, grain size, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-Crystal X-ray Structure and Magnetic Properties of the Polyoxotungstate Complexes Na16[M4(H2O)2(P2W15O56)2].cntdot.nH2O (M = MnII, n = 53; M = NiII, n = 52): An Antiferromagnetic MnII Tetramer and a Ferromagnetic NiII TetramerC. J. Gomez-Garcia, J. J. Borras-Almenar,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGuanidinium Para-Substituted Benzenesulfonates: Competitive Hydrogen Bonding in Layered Structures and the Design of Nonlinear Optical MaterialsVictoria A. Russell, Margaret C. Etter, and Michael D. WardCite this: Chem. Mater. 1994, 6, 8, 1206–1217Publication Date (Print):Au…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyaniline Wires in Oxidant-Containing Mesoporous Channel HostsChun-Guey Wu and Thomas BeinCite this: Chem. Mater. 1994, 6, 8, 1109–1112Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org/d…
A series of four polycarbonates derived from the ethyl, butyl, hexyl, and octyl esters of desaminotyrosyl-tyrosine was prepared by condensation polymerization. The resulting polymers had weight average molecular weights ranging from 120,000-450,000, and their chemical structure was confirmed by elemental analysis, nuc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Dissolved Gas and Salt on the Hydrophobic Force between Polypropylene SurfacesLaurence Meagher and Vincent S. J. CraigCite this: Langmuir 1994, 10, 8, 2736–2742Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1…
The behavior of electromigration-induced voids in narrow, unpassivated aluminum interconnects is examined, using scanning electron microscopy. Some electromigration tests were interrupted several times in order to observe void nucleation, void growth, and finally the failure of the conductor line. It is found that voi…
Time-resolved and steady-state optical data are presented for a series of substituted free-base porphyrins. The porphyrins are grouped into "normal" and "perturbed" categories based on observed photophysical behavior, and the distinctions between the two classes correlate well with the conformations of the molecules.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTert-Butylaluminum Hydroxides and Oxides: Structural Relationship between Alkylalumoxanes and Alumina GelsC. Jeff Harlan, Mark R. Mason, and Andrew R. BarronCite this: Organometallics 1994, 13, 8, 2957–2969Publication Date (Print):August 1, 1994Publication History Published…
Polyhydroxyalkanoate (PHA) synthase has been expressed in Escherichia coli by reengineering the 5'-end of the wild-type (wt) gene and subsequent transformation of this gene into protease-deficient E. coli UT5600 (ompT-). Induction with IPTG results in soluble PHA synthase, which is approximately 5% of the total protei…
Chitin is one of the most abundant polysaccharides found in nature. It is often considered a cellulose derivative although it does not occur in organisms producing cellulose. Cellulose consists of β-(1→4)-D-glucopyranose units. In contrast, chitin has the same backbone but the 2-hydroxy has been replaced by an acetami…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Enantioselective, Catalytic Epoxidation of Trisubstituted OlefinsBridget D. Brandes and Eric N. JacobsenCite this: J. Org. Chem. 1994, 59, 16, 4378–4380Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994…