Materials Literature
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Abstract Boron trifluoride reacted with dipyrid‐2‐ylamine 6 , its N‐methyl and 6,6′‐dimethyl derivatives 8 and 10 , and 3,3′,5,5′‐tetraphenyl‐6‐azapyrromethene 13 to give fluorescent β‐azavinamidine (1,3,5‐triazapenta‐1,3‐diene) dyes: 10‐azapyridomethene–BF 2 complex 5 (λ f 422 nm, λ las 426 nm), its quaternary 10‐met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure, low-temperature, single-crystal neutron diffraction study of deuterated and hydrogenous ammonium hexaaquacopper(II) sulfate (Tutton's salt): a pressure-switchable Jahn-Teller distortionCharles J. Simmons, Michael A. Hitchman, Horst Stratemeier, and Arthur J. S…
Abstract Smectite and zeolites were formed from a volcanic glass as the products of reaction with NaOH solution at 90°C and 100°C under atmospheric pressure. Formation conditions of smectite and various zeolites were determined by the ratio of the amounts of volcanic glass (g) to NaOH (g) in the solution. Smectite was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexanuclear ferric complexes possessing different degrees of spin frustrationCheryl A. Christmas, Hui Lien Tsai, Luca Pardi, Janet M. Kesselman, Peter K. Gantzel, Raj K. Chadha, Dante Gatteschi, Daniel F. Harvey, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of narrow-molecular-weight-distribution polystyrene-poly(dimethylsiloxane) macrocyclic block copolymers and their isobaric precursorsRui Yin and Thieo E. Hogen-EschCite this: Macromolecules 1993, 26, 25, 6952–6957Publication Date (Print):Decemb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlanar-nonplanar conformational equilibrium in metal derivatives of octaethylporphyrin and meso-nitrooctaethylporphyrinKelly K. Anderson, J. David Hobbs, Lian Luo, Kimberley D. Stanley, J. Martin E. Quirke, and John A. ShelnuttCite this: J. Am. Chem. Soc. 1993, 115, 26, 1234…
To elucidate the functional role of the lysyl residue highly conserved in NAD(P)(+)-dependent amino acid dehydrogenases, Lys-80 of leucine dehydrogenase from Bacillus stearothermophilus has been mutated into Ala, Arg, or Gln. All of the mutant enzymes had markedly reduced activities in the oxidative deamination, where…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and metamagnetic behavior of the ferrimagnetic chain compound MnCu(opba)(H2O)2.cntdot.DMSO (opba = o-phenylenebis(oxamato) and DMSO = dimethyl sulfoxide)Humberto O. Stumpf, Yu Pei, Lahcene Ouahab, Francoise Le Berre, Epiphane Codjovi, and Olivier KahnCite t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVoltammetric and UV to near-IR spectroelectrochemical characterization of the meso, meso'-buta-1,3-diyne-bridged octaethylporphyrin dimers {[M(OEP)](.mu.-C4)[M(OEP)]} (M2 = H4, cobalt2, nickel2, copper2, zinc2, palladium2, platinum2, Co/Ni, and Ni/Zn), in their neutral, mono…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of photopolymerizable bolaform amphiphile mono- and multilayersGuangzhao Mao, Yihua Tsao, Matthew Tirrell, H. Ted Davis, Volker Hessel, and Helmut RingsdorfCite this: Langmuir 1993, 9, 12, 3461–3470Publication Date (Print):December 1, 1993Publication History Pu…
Four different DNA fragments each coding for poly(hydroxyalkanoic acid) depolymerase (phaZ1-phaZ4) were isolated in pUC plasmids from a genomic library of Pseudomonas lemoignei in Escherichia coli. All recombinant strains secreted a highly active poly(3-hydroxybutyric acid) depolymerase and produced large translucent…
Spectroscopic measurements on crystals during X-ray data collection provide additional information on the composition of the crystal and can be used in the interpretation of structural data. This paper describes a portable microspectrophotometer to obtain UV–visible–near-IR spectra from single crystals during X-ray me…
Angle-dispersive powder-diffraction techniques using an image-plate area detector have been used to study the high-pressure phases of CdTe to 5 GPa. The recently discovered cinnabar phase between the zinc-blende and NaCl phases is found to be stable on both pressure increase and decrease. No pressure range of single-p…
The effect of additives on synthetic barite crystals, prepared under conditions chosen to mimic those encountered in off-shore oil fields. has been extensively studied. The addition of certain stereochemically related diphosphonates a characteristic morphology change which has been shown to be consistent with a bindin…
The backbone dynamics of specific residues in two collagen-like triple-helical peptides with (X-Y-Gly)n sequences have been investigated using two-dimensional inverse-detected 15N NMR relaxation measurements and hydrogen-exchange experiments. One peptide, (POG)10, has the highest possible imino acid content and is con…
A flexible ϵ-Keggin (Mo12O40) core that can encapsulate either two protons or a Na+ ion is found in the title compounds. In the Na compound (shown on the right) the Na+ guest has the unusual coordination number of four.
Graft polymerization of methoxy-poly(ethylene glycol) methacrylate, an ester of methacrylic acid and monomethoxy-poly(ethylene glycol) (PEO), was performed onto a polyetherurethane (PU) film and tube under different polymerization conditions by a plasma treatment technique. The surface of grafted PU film was character…
Recombinant molecular spectra of O2 in crystalline Kr and Xe, obtained from sudden recombination induced by laser pumping of the predissociative B state, and by adiabatic recombination induced thermally, are reported. All electronic states that correlate with O(3P)+O(3P) are populated by both methods in Kr. The excite…
The dissociative chemisorption of nitrogen on clean and cesiated Ru(0001) surfaces has been studied using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). N2 (at 300 K) chemisorbs dissociatively with a sticking coefficient of 2×10−6, independent of substrate tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegio- and enantioselective catalytic epoxidation of conjugated polyenes. Formal synthesis of LTA4 methyl esterSukbok Chang, Nam Ho Lee, and Eric N. JacobsenCite this: J. Org. Chem. 1993, 58, 25, 6939–6941Publication Date (Print):December 1, 1993Publication History Published…