Materials Literature
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A new route for synthesis of unsymmetrically substituted porphyrins is described. The route follows the earlier approach through pyrromethanes, tripyrrin hydrobromides, and a,c-biladiene dihydrobromides, except that the pyrromethane intermediate is elongated in an initially “clockwise” direction to give a benzyl tripy…
Simultaneous mechanical and molecular characterization of a composite system has been attempted with respect to the interface. The mechanical properties of an E-glass cloth/ y-methacryloxypropyltrimethoxysilane (γ-MPS)/bisphenol-A-fumarate polyester resin composite system were studied as a function of the amount of γ-…
The rate of olefin oxygenation catalyzed by synthetic metalloporphyrins is examined, employing sodium hypochlorite as the oxygen atom source. The rate of epoxidation and the stability of the catalyst are shown to be dependent on the nature of the axial ligand employed. A rationale for this effect is presented and anal…
Abstract Poly( p ‐phenylene), poly(2,6‐naphthylene), poly(2,7‐naphthylene), poly(1,5‐naphthylene), and poly(1,4‐naphthylene) were prepared by nickel‐catalyzed polycondensation of Grignard reagents from the corresponding dibromides. The polymers were annealed in vacuo. Doping with SbF 5 markedly increase the conductivi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective ring-opening polymerization of di-O-methylated and di-O-benzylated 1,4-anhydro-.alpha.-D-ribopyranoses and structure proof of synthetic cellulose-type polysaccharide (1 .fwdarw. 4)-.beta.-D-ribopyranan and (1 .fwdarw. 5)-.alpha.-D-ribofurananToshiyuki Uryu, Junichi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular Photochemical Electron Transfer. 1. EPR and Optical Absorption Evidence for Stabilized Charge Separation in Linked Porphyrin-Quinone MoleculesAlan R. McIntosh, Aleksander Siemiarczuk, James R. Bolton, Martin J. Stillman, Te Fu Ho, and Alan C. WeedonCite this:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuasirelativistic SCF-X.alpha. scattered-wave study of uranocene, thorocene, and ceroceneNotker Roesch and Andrew Streitwieser Jr.Cite this: J. Am. Chem. Soc. 1983, 105, 25, 7237–7240Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Publi…
This paper describes detailed studies on the chlorination of vulcanized elastomer surfaces by an organic chlorine donor and the bonds obtained between such surfaces using a polyamide-cured epoxy adhesive. The bonds produced with a range of commercially important elastomers were found to retain their strength during ex…
A piezoelectric ceramic actuator element with multilayer internal electrodes has been investigated. It was fabricated by multilayer ceramic capacitor techniques. An individual internal electrode has the same area as the element cross section area. It has no piezoelectric inactive part, so that it shows original strain…
X-ray absorption edge and extended x-ray absorption fine structure studies have been undertaken on resting (ferric) horseradish peroxidase, HRP compound I (HRP-I), HRP compound II (HRP-II), and several highly oxidized synthetic iron porphyrins that may have relevance as models for the iron site in horseradish peroxida…
Two-photon dye-laser excitation is used to observe numerous sharp $4{f}^{7}$ levels of ${\mathrm{Eu}}^{2+}$ in Ca${\mathrm{F}}_{2}$ and Sr${\mathrm{F}}_{2}$ which are overlapped by the $4{f}^{6}5d$ band, and thus inaccessible to single-photon spectroscopy. $4{f}^{7}$ excited states belonging to the $^{6}I$ and $^{6}D$…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of silica-immobilized 8-quinolinol with (aminophenyl)trimethoxysilaneMonte A. Marshall and Horacio A. MottolaCite this: Anal. Chem. 1983, 55, 13, 2089–2093Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Published inissue 1 Nov…
To investigate the effects of verapamil on left ventricular systolic and diastolic function in patients with hypertrophic cardiomyopathy, we studied 14 patients at catheterization with a nonimaging scintillation probe before and after serial intravenous infusions of low-, medium-, and high-dose verapamil (total dose 0…
Abstract The rate of thermal decomposition of nickel sulfate was measured in the temperature range from 1003 K to 1078 K. When a powder sample was used, this reaction was characterized as a contracting volume reaction, with apparent activation energy of 296 kJ mol−1. The gaseous products were sulfur trioxide, sulfur d…
By neglecting edge or end effects in electric or magnetic systems and by using certain other conventional approximation techniques one may inadvertently create conditions that contradict some of the assumptions upon which Maxwell stress tensors and stress integrals are derived. Correction terms must then be added to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of sulfate reduction with carbonJohn H. Cameron and Thomas M. GraceCite this: Ind. Eng. Chem. Fundamen. 1983, 22, 4, 486–494Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Published inissue 1 November 1983https://doi.org/1…
The scrambling reaction between Mn2(CO)10 and Re2(CO)10 to form MnRe(CO)10 proceeds cleanly to a stable equilibrium in decalin at 170-190 'C. Studies of the initial rates show that two paths are followed, the major one being evident over the whole range of temperatures and partial pressures of CO above the solutions.…
Abstract Viscoelastic properties of short‐fiber‐reinforced natural rubber composites have been studied as a function of temperature and at different levels of adhesion. The effect of adhesion on the viscoelastic properties of the composites has been assessed, and it is found that the increase in adhesion increases the…
Simple cylindrical models of a hydrogen atom confined in crystalline quartz are considered. The isotropic and anisotropic components of the hyperfine splitting are evaluated by solving numerically the appropriate two-dimensional Schrödinger equation, utilizing an adaptation of a finite element package previously descr…
It is shown that a‐c powder EL deterioration is closely related to sulfur vacancy in the phosphor and the phosphor crystal quality, by measurement of ESR spectrum and x‐ray diffraction pattern. The EL phosphor life is improved with a decrease in the sulfur vacancy density in the phosphor. It is further improved with a…