Materials Literature
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A novel type of mesogenic molecule and a new way of introducing chirality into liquid-crystalline compounds are both realized in roof shaped 1, obtained as a mixture of three diastereoisomers. Compound 1 forms an S mesophase between 102 and 119°C, and its electro-optic switching behavior in an electric field fits the…
Angular distributions of the $^{54}\mathrm{Fe}$(p,n${)}^{54}$Co and $^{54}\mathrm{Fe}$(n,p${)}^{54}$Mn cross sections have been measured to test the Gamow-Teller sum rule [${S}_{\mathrm{\ensuremath{-}}}$-${S}_{+}$=3(N-Z)] in a case where the Gamow-Teller strength is large for both channels. The results for ${S}_{\math…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyhedral aluminosilsesquioxanes: soluble organic analogs of aluminosilicatesFrank J. Feher, Theodore A. Budzichowski, and Keith J. WellerCite this: J. Am. Chem. Soc. 1989, 111, 18, 7288–7289Publication Date (Print):August 1, 1989Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the epoxidation of alkenes by cytochrome P-450 models. 5. Epoxidation of alkenes catalyzed by a sterically hindered (meso-tetrakis(2,6-dibromophenyl)porphinato)iron(III) chlorideDrazen Ostovic and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1989, 111, 17, 6…
We report the structure of two chain compounds formed by manganese(I1) hexafluoroacetylacetonate and nitronyl nitroxide radicals 2-R-4,4,5,5-tetramethyl-4,5-dihydro-lH-imidazolyl-l3--ooxxiyd e, Mn(hfac),NITR, with R ethyl, Et (I), and n-propyl, n-Pr (11), which crystallize in the monoclinic P21/n space group with a =…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarboxylate-histidine-zinc interactions in protein structure and functionDavid W. Christianson and Richard S. AlexanderCite this: J. Am. Chem. Soc. 1989, 111, 16, 6412–6419Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue…
Low-temperature (12 K) resonance Raman spectra are reported for tetragonal and triclinic crystallites of nickel octaethylporphyrin and its meso-d<sub>4</sub>, <sup>15</sup>N<sub>4</sub>, and methylene-d<sub>16</sub>isotopomers. Spectral contributions of the A and B forms in mixed triclinic crystals have been isolated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResponse to criticism of nucleation theory as applied to crystallization of lamellar polymersJohn D. Hoffman and Robert L. MillerCite this: Macromolecules 1989, 22, 8, 3502–3505Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published ini…
Abstract Solid-state nuclear magnetic resonance (NMR) spectroscopy, thermal analysis, and X-ray powder diffraction data on the tubular, hydrous aluminosilicate imogolite were found to be fully consistent with a previously proposed crystal structure consisting of a rolled-up, 6-coordinate Al-O(OH) sheet, bonded to isol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous sonochemistry in radical-chain reactions. Sonochemical hydrostannation and tin hydride reductionEiichi Nakamura, Daisuke Machii, and Tsuyoshi InubushiCite this: J. Am. Chem. Soc. 1989, 111, 17, 6849–6850Publication Date (Print):August 1, 1989Publication History P…
The reaction sodalite = β-nepheline + NaCl ( s ) was reversed in solid-medium apparatus (923 K, 7.6–8.0 kbar; 973 K, 7.4–7.6 kbar; 1073 K, 7.8–8.0 kbar; 1173 K, 8.4–8.6 kbar) and the reaction sodalite = carnegieite + NaCl ( l ) was reversed at 1 bar (1649–1652 K). The calculated slope for the first reaction is −11 bar…
Methods which determine the number and disorder of lattice planes in a crystal from the Fourier cosine coefficients of the intensity profile of an X-ray reflection use only the low harmonics and require that the coefficients be normalized so that the zero harmonic is unity. Experimentally, the profiles can only be rec…
Y(hfac),NITEt (hfac = hexafluoroacetylacetonate; NITEt = 2-ethyl-4,4,5,5-tetramethyl-4,5-dihydlrHo--i midazolyl- 1-oxy 3-oxide) crystallizes in the monoclinic s ace group P21/n with cell parameters a = 11.245 (1) A, b = 17.257 (7) A, c = 18.357 (3) A, 0 = 98.39 (l)", V = 3524.13 R3, and 2 = 4. The crystal structure de…
Studies of the susceptibility of carbon steel (line pipe steel) to pitting were performed at room temperature in deaerated, NaCl-saturated CO2-containing solution simulating natural brine. Measurements of different kinds were made in a wide range of pHs and electrode potentials. The primary corrosion product was ident…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 260. Allylation of .alpha.-hydroxy ketones with allyltrifluorosilanes and allyltrialkoxysilanes in the presence of triethylamine. Stereochemical regulation involving chelated bicyclic transition statesKazuhiko Sato, Mitsuo Kira, and Hide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of elasticity of amorphous networks: effect of constraints along chainsBurak Erman and Lucien MonnerieCite this: Macromolecules 1989, 22, 8, 3342–3348Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTitanium Dioxide Based Substrate for Optical Monitors in Surface-Enhanced Raman Scattering AnalysisJob M. Bello, David L. Stokes, and Tuan. Vo-DinhCite this: Anal. Chem. 1989, 61, 15, 1779–1783Publication Date (Print):August 1, 1989Publication History Published online14 Octo…
Les structures cristallines de sept composes de structure perovskites sont analysees du point de vue du polyedre de coordination de cation. L'analyse indique qu'un compose ABO 3 de structure perovskite peut etre ferroelectrique si le rapport du volume de l'ion A cuboctaedrique et celui de l'ion B octaedrique vaut exac…
Combined oxide additives (Y 2 O 3 , CaO, La 2 O 3 , CeO 2 , SiO 2 , TiO 2 , and Fe 2 O 3 ) were investigated as AIN sintering aids. AIN can be fully sintered at 1600°C to substantial thermal conductivity (92 W/(m·K)) using a multiple sintering aid of Y 2 O 3 , CaO, SiO 2 , La 2 O 3 , and CeO 2 . This lowtemperature ma…
Abstract not Available.