Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and aggregation properties of a new family of amphiphiles with an unusual headgroup topologyThomas M. Stein and Samuel H. GellmanCite this: J. Am. Chem. Soc. 1992, 114, 10, 3943–3950Publication Date (Print):May 1, 1992Publication History Published online1 May 2002P…
Three centric taxa are described from a diatomite deposit in the Harz mountains, Niedersachsen, Germany. The delimination of Cyclotella, Cyclostephanos and Stephanodiscus is discussed and a tighter generic circumscription proposed. Cyclotella radiosa cf. var. pliocaenica is explored and a new genus Pliocaenicus is ere…
Abstract Illite and illite-smectite, with various morphologies, have been formed on quartz grains by precipitation from solution following dissolution of amorphous Al/Si gels at 150-350 degrees C and 0.75-1.0 kbar (75-100 MPa). Initial solutions include deionized water, chloride and oxalate. The experimental results h…
A circular cylinder in which a relative permeability is finite and constant is considered. The surface magnetic charge distributions and the demagnetizing factors are calculated numerically by the surface magnetic charge simulation method and are shown for various cases of different aspect ratios of length to diameter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled double-jet precipitation of sparingly soluble salts. A method for the preparation of high added value materialsJiri Stavek, Milan Sipek, Izumi Hirasawa, and Ken ToyokuraCite this: Chem. Mater. 1992, 4, 3, 545–555Publication Date (Print):May 1, 1992Publication Hist…
peer reviewed
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of copper(I) arenethiolates and its relation to copper(I) luminescence in other complexesD. Martin Knotter, George Blasse, Jacques P. M. Van Vliet, and Gerard Van KotenCite this: Inorg. Chem. 1992, 31, 11, 2196–2201Publication Date (Print):May 1, 1992Publication…
Unusual structures as well as unusual magnetic behavior are displayed by the compounds with the general formula M2[{CuL}3] (M = rare-earth metal from La to Gd; for CuL, see bottom right) described in this communication. The tubelike structural motif of these compounds is shown here for M = Sm. The NdIII derivative has…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of the surface configuration change of polymers in response to changes in environmental conditions. 2. Comparison of changes in air and in liquid waterT. Yasuda, M. Miyama, and H. YasudaCite this: Langmuir 1992, 8, 5, 1425–1430Publication Date (Print):May 1, 1992Pub…
In this paper we report the synthesis of 4-hydroxyphenol (hydroquinone)-substituted phosphazene materials, i.e., hexakis(4-hydroxyphenoxy)cyclophosphazene and poly[bis(4-hydroxyphenoxy)phosphazene], by reaction of 4-methoxyphenoxy-substituted cyclo-and polyphosphazenes with an excess of BBr3. An alternative method is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of manganese(II) framework substitution in MnAPO-11 and Mn-impregnated AlPO4-11 molecular sieves by electron spin resonance and electron spin-echo modulation spectroscopyGuillaume Brouet, Xinhua Chen, Chul Wee Lee, and Larry KevanCite this: J. Am. Chem. Soc. 1992,…
Vier an Si‐Atomen verankerte ReO 4 ‐Einheiten liegen im löslichen metallhaltigen Siloxan 1 vor, das aus dem Silantriol t BuSi(OH) 3 und Re 2 O 7 zugänglich ist. Das Kondensationsstable t BuSi(OH) 3 kann durch Hydrolyse von t BuSiCl 3 in hohen Ausbeuten hergestellt werden. Verbindungen wie 1 interessieren als Modellsub…
The cytotoxicity (in the dark), phototoxicity (red light) and subcellular localization (using confocal laser scanning microscopy) were determined for 15 porphyrins (1-15) in C6 glioma cells. The partition coefficient in 2-octanol was also determined for each porphyrin at pH 7.4. The cytotoxicity increased with pi (log…
Abstract Peroxo complexes prepared by the reaction of titanoundecatungstophosphate (PTiW11O405−) and dititanodecatungstophosphate (PTi2W10O407−) with hydrogen peroxide are characterized by means of the 183W NMR spectroscopy and the single crystal X-ray diffractometry. Electronic spectra and permanganate titration anal…
Domain switching of 90° ferroelectric domains in tetragonal BaTiO3 and PbTiO3 is induced by the application of stress along specific crystallographic axes. For BaTiO3, single-domain crystals are obtained from twinned specimens by the application of ∼1.1 MPa of stress parallel to the a axis and twin boundaries are indu…
Abstract Hydrotalcite pillared by polyoxometalates of Mo and W catalyzed epoxidation of alkenes with H2O2 with significant shape selectivity; epoxidation of 2-hexene was favored than that of cyclohexene. The subsequent hydrolysis of epoxides to form diols was retarded compared to hydrotalcite-free catalysts.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparations, x-ray crystal structures, EH band calculations, and physical properties of [(TTF)6(H)(XM12O40)(Et4N)] (M = tungsten, molybdenum; X = phosphorus, silicon): evidence of electron transfer between organic donors and polyoxometalatesL. Ouahab, M. Bencharif, A. Mhann…
Four ReO4 units each anchored to a silicon atom are found in the soluble metal-containing siloxane 1, accessible from the silanetriol tBuSi(OH)3 and Re2O7. The silanetriol does not undergo condensation reactions and can be prepared from tBuSiCl3 by hydrolysis in high yield. Compounds like 1 are interesting as model co…
In ordered L${1}_{2}$-type ${\mathit{A}}_{3}$B compounds, each A atom is coordinated by 8A+4B atoms, while each B atom is coordinated by 12A atoms. By symmetry, all A-A, A-B, and B-B bond lengths are equal. When this structure disorders to form the substitutionally random ${\mathit{A}}_{0.75}$${\mathit{B}}_{0.25}$ all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic viscosity of model Starburst dendrimersMarc L. Mansfield and L. I. KlushinCite this: J. Phys. Chem. 1992, 96, 10, 3994–3998Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1021…