The role of transition metals in the chemical synthesis of corrins
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The meso-reactivity of porphyrins and related compounds. Part IV. Introduction of oxygen functions
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…
Environment of interstitial ions in a Prussian blue analog, Co3[Co(CN)6]2
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…
Paramagnetic anisotropies and zero-field splitting of some high-spin iron(III) complexes
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…
Determination of the Water Vapor Permeability and Continuity of Ultrathin Parylene Membranes
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…
Cations and cation radicals of porphyrins and ethyl chlorophyllide a
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…
Cathodoluminescent Ln[sub y] (SiO[sub 2])[sub x]:Tb Phosphors
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.
FLUOR-POLYLITHIONITE: A LITHIUM MICA WITH NEARLY HEXAGONAL (Si2O5)2- RING
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…
Studies in the system calcium sulphate–water. Part I. Kinetics of dehydration of calcium sulphate dihydrate
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…
The incorporation of basal slip dislocations in {1012} twins in zinc crystals
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…
Particle size and molecular weight effects on the melt flow of emulsion PVC
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…
Anodic Polarization of Titanium and Titanium Alloys in Hydrochloric Acid
Commercially pure titanium and the alloys studied exhibited active to passive transitions in . Increasing the acid concentration increased the critical current density for passivity and the dissolution current density in the passive range and shifted the critical potential for passivity in the noble direction. Increas…
The Coercivity of Hard Ferrite Single Crystals
Abstract Magnetic properties of Sr‐, Ba‐ and Sr‐Ba‐ferrite single crystals are reported. From torque measurements results: Sr‐ferrite: M s = (380 ± 20) G, K 1 = (3.5 ± 0.1) × 10 6 erg cm −3 ; Ba‐ferrite: M s = (380 ± 20) G, K 1 = (3.2 ± 0.1) × 10 6 erg cm −3 . A large difference was found by a comparison of H ci, theo…
The crystal structure and magnetic properties of tetra-µ 3 -methoxytetrakis[salicylaldehydato(ethanol)nickel( II )]
The crystal structure of [Ni(OMe)(o-O·C6H4·CHO)(EtOH)]4 has been determined by three-dimensional single-crystal X-ray methods. Four molecules of point symmetry (S4) occupy a tetragonal unit cell with a= 22·17, c= 9·70 Å in space group I41/a. The four nickel atoms in the molecule occupy the corners of a nearly regular…
A COMPARATIVE STUDY OF BICARBONATE INHIBITION OF ROOT GROWTH IN CALCICOLE AND CALCIFUGE GRASSES
S ummary A study has been made of the effects of bicarbonate on the root growth of a number of calcicole and calcifuge grasses. Differential effects of bicarbonate concentrations likely to be encountered in a calcareous soil solution (0–10 m‐equiv./litre) were found between the species. In general the root growth of c…
Single-crystal Raman spectroscopy of ‘square-planar’ and ‘tetrahedral’ CuCl 4 2– ions, of the ZnCl 4 2– Ion, and of CuCl 2 ,2H 2 O
The Raman spectrum of CuCl2,2H2O is assigned unambiguously from single-crystal and deuteriation studies. In the case of (CH3NH3)2CuCl4 the assignment of the main bands from single-crystal studies is again unambiguous, but for the species containing ‘tetrahedral’ ions (Cs2CuCl4 and Cs2ZnCl4) only tentative assignments…
Band Structure and Nature of Lattice Defects in GeTe from Analysis of Electrical Properties
Abstract The measured transport properties of non‐stoichiometric GeTe have been satisfactorily analysed on the basis of a two‐carrier model and the various band parameters have been evaluated. In particular the variation of the carrier density of the system with composition has been obtained and then compared to the t…
The wetting of cellulose and wood hemicelluloses
Abstract The wetting properties of wood polysaccharides were characterized by Zisman's empirical parameter, the critical surface tension of wetting, γ c . Cellulose was tested in the form of cellulose films regenerated from viscose and cellulose acetate. It was found that the source of cellulose (cotton, wood and hydr…
Permeation through plastic films
Abstract Data are presented on the solubility in and permeation through polyolefin films of a number of gases and liquids. The permeation rates are found to be dependent on the type of film, the concentration and the temperature. A classical diffusion model explains the permeation mechanism and other relations serve t…
Poly(2,6-diphenyl-1,4-phenylene oxide)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(2,6-diphenyl-1,4-phenylene oxide)Allan S. HayCite this: Macromolecules 1969, 2, 1, 107–108Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi/10.1021/ma60007a022https://doi.org/10…