Materials Literature
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Some apparently penta-co-ordinate mononitrosyls, prepared by the reaction of nitric oxide with the high-spin compounds, NN′-ethylenebis(salicylideneiminato)iron(II) and its 5-Me-, 3-NO2-, 5-Cl-, 4-Cl-, and 5-NO2-substituted derivatives, have three unpaired electrons at room temperature. The magnetic moment of the unsu…
Abstract In this article an investigation is made of deformation of the molecular crystal due to electronic excitation. It is shown that in a three‐dimensional crystals at a sufficiently large resonance interaction between molecules the states of free excitations with positive effective mass correspond to minimum of t…
Two melting reactions, (i) CaCO_3 + Ca(OH)_2 = liquid and (ii) CaCO_3 + Ca(OH)_2 + vapor = liquid, have been extended from 4 kb to 40 kb using piston-cylinder \napparatus. Points measured for reaction (i) are: 655°C at 4 kb, 659°C at 15.5 \nkb, 662°C at 25 kb, and 666°C at 40.7 kb; and for reaction (ii): 630°C…
Abstract In 1959, Hyde and Wehrly described an emulsion polymerization of permethylcyclosiloxanes. This unique example of an emulsion polymerization proceeding via an ionic mechanism involved base catalysis with a cationic surfactant. An analogous acid‐catalyzed anionic emulsion polymerization has now been developed w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching of pyrochlorophyll fluorescence by nitro compoundsGilbert R. SeelyCite this: J. Phys. Chem. 1969, 73, 1, 125–129Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi/10.1021/j1…
The syntheses of tristetrachlorobenzene-1,2-dithiolene complexes [M(S2C6Cl4)3]z(z=–2, M = Ti, V, Cr, Mn, Fe and W; z= 1, M = V, W, and Re; z= O, M = W) are reported. The preparation of [W(S2C6H3Me)3]– and of a manganese tristoluene-dithiolene species are described. Voltammetric studies of these tris-tetrachlorobenzene…
The adhesion between glass or oxidized Si substrates and evaporated gold films in combination with an adherent intermediate layer of Ta, Si, Ge, or Cr has been investigated. The experimental results regarding changes of adhesion as a function of the relative thickness of the Au and underlayer films as well as time, en…
The vibrational spectrum of crystalline Re2O7 is discussed from the point of view of a factor-group analysis. The Raman spectrum changes radically on passing from the solid state to the gaseous or liquid states. The changes observed reflect the presence of a monomeric species in the gaseous or liquid state, compared w…
Abstract Three different emulsion polymerization techniques, the batch (B), monomer addition (M Add), and emulsion addition (E Add) procedures were studied. Rates of polymerization indicated that the B reacted more rapidly than either the M Add or E Add. This was related to the lower monomer concentration present in t…
Abstract
Treatment of octaethylporphyrin with hydrogen peroxide in concentrated sulphuric acid in the cold gives a monoxy-derivative: the earlier structures advanced for this type of compound are disproved, and this particular example is formulated as 2,3,7,8,12,13,18,18-octaethyl-17-oxochlorin. By-products are observed, one o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnvironment of interstitial ions in a Prussian blue analog, Co3[Co(CN)6]2Duward F. Shriver and David Basset BrownCite this: Inorg. Chem. 1969, 8, 1, 42–46Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969htt…
The principal and mean magnetic moments of Fe acac3(acac = acetylacetonate) and K3Fe(oxalate)3,3H2O are reported over the temperature range 80–300°K. This appears to be the first time that anisotropy of the 6A1g ground-state of the iron(III) ion has been detected by crystal magnetic susceptibility measurements. The an…
A method has been developed to determine the water vapor permeability of very thin dielectric films over a large range of thicknesses. It is shown that the permeability of poly(chloro‐ p ‐xylylene) unsupported thin films is the same throughout the range of thicknesses tested: 292–73,388Aå. The results agree with value…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCations and cation radicals of porphyrins and ethyl chlorophyllide aRonald H. Felton, David Dolphin, Donald C. Borg, and Jack FajerCite this: J. Am. Chem. Soc. 1969, 91, 1, 196–198Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published…
The synthesis of terbium‐activated compounds in system is described and their cathodoluminescence is compared to , , and other efficient Tb +3 ‐activated phosphors. The utility of the Tb +3 phosphors in tricolor CR tubes is also considered.
X-ray diffraction crystal-structure analysis of synthetic fluor-polylithionite, KAlLi2Si4O10F2, shows that this mica has a partially ordered octahedral cation distribution, with one site occupied by Li, and the other by Al1/2Li1/2, approximately. This ordering and distorted tetrahedra cause the surface oxygen ring to…
The kinetics of dehydration of synthetic calcium sulphate dihydrate have been studied between 80° and 152°, at partial pressures of water vapour between 10–5 and 45 mm. The products of reaction are controlled by both temperature and partial pressure. At temperatures greater than 110° the dehydration is controlled by a…
An electron microscope investigation has been made of the decomposition of ⅓⟨1120⟩ slip dislocations when they penetrate {1012} twin boundaries in zinc. The results show that basal dislocations decompose into an integral number of zonal twinning dislocations and a glissile slip dislocation in the twin. The previously…
Abstract The melt flow behavior of straight emulsion‐polymerized PVC in a capillary extrusion rheometer has been found to depend upon both the molecular weight and the particle size of the sample. Observations of flow‐rate, post‐extrusion swell, and extrudate appearance, as functions of extrusion temperature and press…