Materials Literature
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The synthesis and structural characterization of three mixed-valence π-cation radical derivatives of (octaethylporphinato)metal(II) species, [M(OEP • /2 )] 2 +, (M = Ni, Cu, and (Zn,H 2 )), are reported. The species thus have the same formal ring oxidation level as the photooxidized special pair of photosynthetic reac…
Simple conditions were discovered to afford tripyrranes by reaction of 2,5-bis(α-hydroxymethyl)furan or 2,5-bis(α-hydroxy-α-phenylmethyl)thiophene with excess pyrrole in the presence of acid catalyst. Stepwise synthesis of porphyrins with core-ligand modification and synthesis of meso-tetraarylporphyrins bearing two d…
Behaviour: the contribution of micromechanical approaches to the modelling of inelastic behaviour of polycrystals micromechanisms of plasticity under multilaxial cyclic loading stacking fault energy and cyclic hardening FOC solid solutions undermultiaxial nonproportional loadings yield surfaces and dislocation structu…
Decay rates of four leaf species and birch wood in a softwater stream, changes in ergosterol content of the substrate, and release of conidia of aquatic hyphomycetes from these substrates were followed over time. On all leaves, maximum conidium production occurred before ergosterol content peaked; on birch wood, the t…
The oxidation of lineal, cyclic, and bicyclic aliphatic p -chlorobenzoic and p -chorobenzenesulfonic acid esters 2 with methyl(trifluoromethyl)dioxirane (TFDO) ( 1 ) occurs at positions in the hydrocarbon chain distant from the directing group with a significant degree of selectivity to give the corresponding keto or…
ESR spectroscopy has been used to identify the paramagnetic species trapped at 77 K upon γ-irradiation of glassy water prepared by hyperquenching of liquid water at cooling rates exceeding 10 5 K/s. Besides OH radicals, which are the only paramagnetic intermediates of water radiolysis stabilized at 77 K in hexagonal i…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Chain Stiffness on Polymer Phase BehaviorY.-J. Sheng, A. Z. Panagiotopoulos, and S. K. KumarView Author Information School of Chemical Engineering, Cornell University, Ithaca, New York 14850-5201 Department of Materials Science and Engineering, The Pennsylvania State…
Using a two-dimensional self-consistent field theory, we investigate the interaction between two planar surfaces where (1) each surface is grafted with both A and B homopolymers and (2) one surface is coated with end-grafted A's and the other is coated with end-grafted B's. The chains are grafted at low densities and…
The UV (3.8 eV) photolysis of atomically-dispersed Rh I (CO) 2 species supported on an Al 2 O 3 surface in the presence of N 2 at 175 K caused the replacement of CO by N 2 ligands. Therefore dinitrogen chemisorption effectively probes the coordinatively unsaturated Rh(CO) species generated during photodecomposition of…
Small-angle X-ray scattering (SAXS) was employed to investigate the order−disorder transition of low molecular weight polystyrene- block -polyisoprene (SI diblock) copolymers with widely varying composition. The SI diblock copolymers investigated in the present study have molecular weight varying from 15 000 to 41 000…
The deflection of bimorphs consisting of thin films of nickel on silicon substrates has been accurately measured as a function of applied in-plane magnetic field, using an optical method. Striking differences in the magnetoelastic behavior are observed for these systems compared with bulk nickel, mainly due to the ani…
Metallophthalocyanines (MPc's) [M being one of the following metal ions: Co(II), Ni(II), Cu(II), or Zn(II)], bearing amide side chains and being highly soluble in organic solvents, have been synthesized by starting from the corresponding phthalonitrile. All four compounds can form Langmuir and Langmuir−Blodgett films,…
Abstract Carbosilane dendrimers with up to 108 end groups were prepared by a divergent synthetic route via repeated alternating Grignard‐reaction with allylmagnesium bromide and hydrosilylation. Quantitative hydroboration of the dendrimers was achieved with 9‐BBN/H 2 O 2 ,OH − . Employing this synthetic route, rather…
The contact line quadrilateral relation is a generalization of the classical Neumann triangle relation that includes the effect of line tension. The relation is derived using a minimum free energy principle that may be graphically represented by a quadrilateral whose four sides consist of three surface tension quantit…
The effect of exposure time of thin films of soluble collagen to glutaraldehyde (GTA) vapour was studied at 37 degrees C, and was evaluated by examining the thermal and biological stability and the swelling ratio. It was found that the collagen films treated with GTA vapour for 18 h showed the highest denaturation tem…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransition Metal-Catalyzed Silanone GenerationRoman Goikhman, Michael Aizenberg, Linda J. W. Shimon, and David MilsteinView Author Information Departments of Organic Chemistry and Chemical Services The Weizmann Institute of Science Rehovot 76100, IsraelCite this: J. Am…
Halide recognition by a porphyrin aggregate at the air-water interface has been studied. π-A Isotherms and UV reflection spectra of mixed monolayers of 5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrin, trivial name ‘N-confused tetraphenylporphyrin’(NC-TPP), with methyl octadecanoate were measured in 1 mmol dm–3 NaX aque…
This book reviews the current state of the theory of pattern formation by a liquid-solid interface during crystal growth. It gives a pedagogical introduction to the subject, including experimental results, mathematical modeling and linear stability analysis. After highlighting the success of the theory in resolving th…
Reaction of Al(OH) 3 and MgO or Mg(OH) 2 with triethanolamine [TEA, N(CH 2 CH 2 OH) 3 ] in ethylene glycol (EG) provides, in one step, access to a polymer-like precursor to spinel. On the basis of high-resolution mass spectroscopy, chemical analysis and 27 Al solution NMR, the precursor appears to be a trimetallic dou…
The self-assembly of nanometre-sized Au and CdS particles to well defined multilayer structures on dithiol derivatised gold surfaces is quantitatively studied by quartz crystal microgravimetry.