Materials Literature
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The porphyrin rings in the porphyrin dimer 1 are nearly planar, but they are considerably tilted toward each other. Compound 1 is of interest as a model for the special pair of the photosynthetic reaction center. The average distance between the two porphyrin planes is only 3.43 Å. The resulting strong interactions—re…
A successful technique for electroejaculation with nonmetallic electrodes cut from defibrillation pads is described. Twenty-six adult male cynomolgus and eleven adult male rhesus macaques were electroejaculated while immobilized with chair restraint. From 123 attempted electroejaculations in both species of macaques,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic polyphosphazenes with spiropyran unitsHarry R. Allcock and Chulhee KimCite this: Macromolecules 1991, 24, 10, 2846–2851Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical, electrochemical, and chemical formation of the .pi.-cation-radical species of magnesium phthalocyanine. Analysis of the absorption and MCD spectra of [MgPc(-1)].bul.+Edward Ough, Zbigniew Gasyna, and Martin J. StillmanCite this: Inorg. Chem. 1991, 30, 10, 2301…
Abstract The chemistry of the catalyst‐cocatalyst interaction was investigated in systems containing different internal/external donor pairs. Qualitatively similar results were obtained with the ethyl benzoate/methyl p ‐toluate (EB/MPT) and dibutyl phthalate/triethoxy(phenyl)silane (DBP/EPS) systems, which thus were a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-lived photoinitiated charge separation in carotene-diporphyrin triad moleculesDevens Gust, Thomas A. Moore, Ana L. Moore, Feng Gao, David Luttrull, Janice M. DeGraziano, Xiaochun C. Ma, Lewis R. Makings, Seung Joo Lee, and Cite this: J. Am. Chem. Soc. 1991, 113, 10, 363…
A valence force field for free-base porphine (H<sub>2</sub>P) is developed from a recently reported Ni-porphine (NiP) force field (Li, X.-Y.; et al. J. Phys. Chem. 1990, 94, 31-47). It allows for force constant adjustments related to bond length changes indicated by X-ray diffraction studies. All fundamental frequenci…
Properties of new homologous series of low molecular mass thermotropic liquid crystals containing non-linear mesogenic cores, 2,5-thiophene (T) and 2,2′-bithio-phene (BT), are presented for the purpose of refining molecular structural prerequisities for liquid crystallinity. Herein we focus on the effect of core linea…
Abstract High‐surface‐area, Zr‐pillared, layered clays are synthesized and characterized for their adsorption properties. Although large free interlayer spacings are claimed in the literature (as also found in this work, 14.3 Å), the limiting pore size is the narrow interpillar spacing. The distribution of interpillar…
An efficient and stable eigenmode method is presented for the analysis of dielectric gratings of arbitrary profiles and thicknesses. The solution is expanded in terms of multiple sets of modes. The method differs from the usual eigenmode methods in that mode couplings are achieved through an iterative one-way wave mul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanum copper tin oxide (La2CuSnO6): a new perovskite-related compound with an unusual arrangement of B cationsMark T. Anderson and Kenneth R. PoeppelmeierCite this: Chem. Mater. 1991, 3, 3, 476–482Publication Date (Print):May 1, 1991Publication History Published online1…
Single crystals have been successfully grown by floating-zone melting of an intermetallic compound Ti3Al which has the β- to α-phase transformation at about 1453 K. Single-crystal specimens of three major orientations were compressed in a temperature range from 300 to 1273 K and examined for the deformation characteri…
Review: Organic conducting materials show potential for applications in, for example, electrostatic shielding or in pressure sensing. In the past, research aimed at the optimization of the properties of these materials e.g. the charge‐transfer (CT) complex tetrathiafulvalene/tetracyanoquinodümine (TTF/TCNQ, see figure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, redox behavior, and magnetic and spectroscopic properties of copper(II)copper(II)copper(II), copper(II)nickel(II)copper(II), and copper(II)palladium(II)copper(II) species. Crystal structure of [L2Cu2Cu(dmg)2Br]ClO4.cntdot.CH3OH (L = 1,4,7-trimethyl-1,4,7-triazacyc…
Polarized light leads to an effective reorientation of the optic axis in the glassy state of liquid-crystalline side chain polymers containing azobenzene mesogenic groups, via a trans-cis and cis-trans isomerization. Using a combination of U V and IR dichroitic studies it is shown for copolymers consisting of chromoph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiempirical theory of relaxation: concentrated polymer solution dynamicsJack F. Douglas and Joseph B. HubbardCite this: Macromolecules 1991, 24, 11, 3163–3177Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https…
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Electronic applications of semiconductor diamonds are addressed. Doping and electrical properties of these films, formation of low-resistive 'ohmic' contacts, surface modification methods, and experimental device applications are discussed. Of particular interest are high-temperature (300 degrees C) MOSFETs and metal…
Abstract The synthesis of methanol from CO2 and H2 in a flow reactor was studied over CuO–ZnO catalysts combined with ZrO2, MgO, Al2O3, or Cr2O3 under a presssure of 13 atm. CuO–ZnO–Al2O3, CuO–ZnO–ZrO2, and CuO–ZnO–MgO showed higher activity and higher selectivity for methanol than did CuO–ZnO. The selectivity for met…
The effect of grain size on the mechanical properties of metastable Ti–15V–3Cr–3Sn–3Al β titanium alloy has been investigated. In the solution annealed condition the small grain sized specimens are of strength higher than the large grain sized specimens. However, when the alloy is aged the large grain sized specimens…