Macromolecular engineering of polylactones and polylactides. 8. Ring-opening polymerization of iε-caprolactone initiated by primary amines and trialkylaluminum
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Luminescence of copper(I) arenethiolates and its relation to copper(I) luminescence in other complexes
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…
One‐Dimensional MIIICuII Compounds with an Unprecedented, Tubelike Structural Motif (M = Rare‐Earth Metal)
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…
Dynamics of the surface configuration change of polymers in response to changes in environmental conditions. 2. Comparison of changes in air and in liquid water
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…
Functionalization of phosphazenes. 1. Synthesis of phosphazene materials containing hydroxyl groups
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…
Evaluation of manganese(II) framework substitution in MnAPO-11 and Mn-impregnated AlPO4-11 molecular sieves by electron spin resonance and electron spin-echo modulation spectroscopy
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,…
[tBuSiO(ReO4)]4, eine Modellverbindung für Metalloxide auf Silicatoberflächen — Synthese aus dem stabilen Triol tBuSi(OH)3 und Re2O7
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…
EVALUATION OF PORPHYRIN CHARACTERISTICS REQUIRED FOR PHOTODYNAMIC THERAPY
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…
183W NMR and X-Ray Crystallographic Studies on the Peroxo Complexes of the Ti-Substituted α-Keggin Typed Tungstophosphates
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…
Piezoelectrically-induced switching of 90° domains in tetragonal BaTiO3 and PbTiO3 investigated by micro-Raman spectroscopy
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…
Shape Selective Epoxidation of Alkenes Catalyzed by Polyoxometalate-Intercalated Hydrotalcite
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.
Preparations, 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 polyoxometalates
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…
[tBuSiO(ReO4)]4, a Model Compound for Metal Oxides on Silicate Surfaces—Synthesis from the Stable Triol tBuSi(OH)3 and Re2O7
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…
Electronic structure of ordered and disorderedCu3Au andCu3Pd
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…
Intrinsic viscosity of model Starburst dendrimers
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…
Functional interactions between proteins of the phosphoenolpyruvate:sugar phosphotransferase systems of Bacillus subtilis and Escherichia coli.
Proteins of the phosphoenolpyruvate:sugar phosphotransferase system (PTS) of Bacillus subtilis were overexpressed, purified to near homogeneity, and characterized. The proteins isolated include Enzyme I, HPr, the glucose-specific IIA domain of the glucose-specific Enzyme II (IIAglc), and the mannitol-specific IIA prot…
Structural implications of spectroscopic characterization of a putative zinc finger peptide from HIV-1 integrase.
The N-terminal domain of human immunodeficiency virus (HIV-1) integrase (IN) contains the sequence motif His-Xaa3-His-Xaa23-Cys-Xaa2-Cys, which is strongly conserved in all retroviral and retrotransposon IN proteins. This structural motif constitutes a putative zinc finger in which a metal ion may be coordinately boun…
Electrochemical Decontamination of Metallic Surfaces Contaminated by Spent-Fuel Storage Pool Water
It was earlier shown theoretically that the radioactivity released by spent-fuel elements into storage pool water is predominantly carried by positive ions. A new decontamination method is described in which freshly contaminated metallic surfaces are decontaminated electrochemically, resulting in smooth, shiny surface…
Separation of 24-Methylenecycloartanol from Cycloartenol Via a Chemical Method
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of 24-Methylenecycloartanol from Cycloartenol Via a Chemical MethodShoei-Sheng Lee, Liang-Hwa Young, and K. C. WangCite this: J. Nat. Prod. 1992, 55, 5, 644–648Publication Date (Print):May 1, 1992Publication History Published online1 July 2004Published inissue 1 M…
Complex viscosity for the rigorous formulation of the multibead internal viscosity model with hydrodynamic interaction
ADVERTISEMENT RETURN TO ISSUEPREVArticleComplex viscosity for the rigorous formulation of the multibead internal viscosity model with hydrodynamic interactionT. P. Dasbach, C. W. Manke, and M. C. WilliamsCite this: J. Phys. Chem. 1992, 96, 10, 4118–4125Publication Date (Print):May 1, 1992Publication History Published…