Materials Literature
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By using the isolobality principle, it is shown that the electronic structures of the 4- through 9-atom organo-transition metal clusters are closely analogous to the corresponding boranes. This parallelism is extended beyond simple structural similarities and is used to account for the high reactivity and nmr fluxiona…
Abstract The kinetics and yields of N ‐trifluoracetylation of polyamides, polyesteramides, polyurethanes were studied by direct titration of trifluoracetic acid formed during the conversion. For polycaprolactam a limiting yield, corresponding to a complete substitution, was always achieved, independently of polymer mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and molecular structure determination of carboxyl bound nicotinic acid (niacin) complexes of chromium(III)James C. Chang, Larry E. Gerdom, Norman C. Baenziger, and Harold M. GoffCite this: Inorg. Chem. 1983, 22, 12, 1739–1744Publication Date (Print):June 1, 1983Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical synthesis of amino-group-containing (1 → 6)-α-D-glucan derivatives by ring-opening polymerization of 1,6-anhydroazido sugarsToshiyuki Uryu, Kenichi Hatanaka, Kei Matsuzaki, and Hiroyoshi KuzuharaCite this: Macromolecules 1983, 16, 6, 853–858Publication Date (Print):…
The three dissimilar subunits of pig heart DPN-dependent isocitrate dehydrogenase, which normally occur in the ratio 2 alpha:1 beta:1 gamma, have been separated by chromatofocusing. The subunits were first dissociated from native enzyme (specific activity, 15-20 units/mg) with minimal unfolding in 2 M urea and chromat…
Glass‐formation limits were determined for the PbO, CaO, SrO, and ZnO germanate systems. All of these systems exhibit phase separation over at least a portion of the glass‐formation range. Data are reported for the thermal expansion coefficient, glass‐transformation temperature, and helium permeability of these glasse…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling in tris(.mu.-hydroxo)bis[(1,4,7-trimethyl-1,4,7-triazacyclononane)chromium(III)] triperchlorate trihydrateD. Eric Bolster, Philipp Guetlich, William E. Hatfield, S. Kremer, E. Wolfgang Mueller, and Karl WieghardtCite this: Inorg. Chem. 1983, 22, 12, 1725–17…
Raman spectral observations were used to characterize the vapor‐deposited Sic coatings on the microspheres used for fuels in high‐temperature gas‐cooled reactors. Good correlation was found between this nondestructive optical method and other characterization data. The SIC coatings, derived from methyltrichlorosilane,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer and infrared studies of matrix-isolated iron-carbonyl complexesCharles H. F. Peden, Stewart F. Parker, Paul H. Barrett, and Ralph G. PearsonCite this: J. Phys. Chem. 1983, 87, 13, 2329–2336Publication Date (Print):June 1, 1983Publication History Published online1…
Electronic effects play a predominant role in the stereochemistry of Cu2+ -compounds and are conveniently described in terms of first order or pseudo Jahn-Teller coupling. Examples for the coordination numbers 4, 5 and 6 are given and discussed in detail. Some general conclusions with respect to those geometries, whic…
Hydrothermal synthesis of Fe‐pum‐pellyites was conducted using high pressure cold‐seal apparatus and solid oxygen buffering techniques at temperatures between 250°C and 550°C and 2.0–9.1 kbar P fluid . Fe‐pumpellyites were synthesized from partially crystalline gel mixtures of compositions: 4CaO ‐ 2.1Al 2 O 3 _1.5FeO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleConformational characterization of silk fibroin in intact Bombyx mori and Pilosamia cynthia ricini silkworms by carbon-13 NMR spectroscopyTetsuo Asakura, Hiroshi Suzuki, and Yasuo WatanabeCite this: Macromolecules 1983, 16, 6, 1024–1026Publication Date (Print):June 1, 1983Public…
We studied thin films of cuprous oxide deposited on glass coated with transparent conducting indium–tin oxide (ITO) films. The deposition of both Cu2O and ITO was made by rf sputtering in an Ar/O2 gas mixture. For the deposition of Cu2O a pure copper target was used and ITO films were deposited from a disk target, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordinately unsaturated clusters. A novel catalytic reactionR. R. Burch, A. J. Shusterman, E. L. Muetterties, R. G. Teller, and Jack M. WilliamsCite this: J. Am. Chem. Soc. 1983, 105, 11, 3546–3556Publication Date (Print):June 1, 1983Publication History Published online1 Ma…
The structure of various imidazoles on the surfaces of copper and gold mirrors has been studied by Fourier transform infrared reflection–absorption spectroscopy in order to elucidate the molecular mechanisms of corrosion inhibition of metal surfaces by imidazoles. Heptadecylimidazole, undecylimidazole, phenylimidazole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal magnetic study on ferromagnetic manganese(II) phthalocyaninateSamaresh Mitra, A. K. Gregson, William E. Hatfield, and Robert R. WellerCite this: Inorg. Chem. 1983, 22, 12, 1729–1732Publication Date (Print):June 1, 1983Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA bis-pocket porphyrinKenneth S. Suslick and Mary M. FoxCite this: J. Am. Chem. Soc. 1983, 105, 11, 3507–3510Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June 1983https://doi.org/10.1021/ja00349a023RIGHTS & PERMISSION…
A series of electrochemical measurements have been performed on a variety of n‐ and p‐type Si wafers of {100} and {111} orientation in aqueous . It has been determined that {100} surfaces have similar, systematic features regardless of carrier type and doping level below 10 20 cm −3 , while {111} surfaces have a diffe…
Abstract The influence of the addition of two ethylene‐propylene random copolymers (EPM) with different composition on the mechanical properties, thermal behavior and overall morphology of high density polyethylene (HDPE)/isotactic polypropylene (iPP) blends, was investigated on extruded samples. The experimental data…
Abstract An improved cube method has been developed for calculating the intensity of diffuse x‐ray scattering of macromolecules in solution using a certain set of their atomic coordinates. The technique is based on the ideas of B. Lee and F. M. Richards [(1971) J. Mol. Biol. 55 , 374–400] and Richards [(1977) Annu. Re…