Chemistry: Recent submissions
Now showing items 181-200 of 234
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Calorimetric, Spectroscopic, and Structural Studies of Anhydrous Zinc Bromide
(1984)No abstract available. -
Energetics of Long Alkyl Chains Embedded in a Crystalline Matrix - (Normal-C18h37nh3)2cdcl4
(1984)No abstract available. -
Measuring the Geometric Component of the Transition-Probability in a 2-Level System
(1991-04)We describe the measurement of a component of the nonadiabatic transition probability in a two-level system that depends only on the path through parameter space followed by the Hamiltonian, and not on how fast the path ... -
Sodium distribution in sodium tellurite glasses probed with spin-echo NMR
(1997-09)We present results on the spatial distribution of sodium cations in sodium tellurite glasses as a function of sodium oxide content, obtained using a spin-echo NMR experiment. Glasses were studied with sodium oxide content ... -
Structure and Disorder of Phosphates in Ag2o-Agi-P2o5 Glasses
(1993-06)We directly probe the microstructure of the different phosphates in several glasses in the Ag2O-AgI-P2O5 system, by means of variable angle correlation NMR spectroscopy. This two-dimensional experiment separates the ... -
Phonon dispersion and Gruneisen parameters of zinc dicyanide and cadmium dicyanide from first principles: Origin of negative thermal expansion.
(2007)Zinc dicyanide, Zn(CN)2, and the isostructural cadmium dicyanide show neg. thermal expansion over a broad range of temps. By the use of d. functional theory calcns., we det. the phonon dispersion curves of these materials ... -
First-principles study of the nuclear quadrupole resonance parameters and orbital ordering in LaTiO3.
(2009)The electronic structure of the distorted perovskite LaTiO3 is studied using d.-functional theory, implemented with a projector-augmented wave formalism together with the local-d. approxn. plus Hubbard U-parameter (LDA+U) ... -
Non-Abelian Effects in a Quadrupole System Rotating Around 2 Axes
(1990-09)No abstract available. -
Density-operator theory of orbital magnetic susceptibility in periodic insulators
(2011-08)The theoretical treatment of homogeneous static magnetic fields in periodic systems is challenging, as the corresponding vector potential breaks the translational invariance of the Hamiltonian. Based on density operators ... -
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Genomic analysis of stationary-phase and exit in Saccharomyces cerevisiae: Gene expression and identification of novel essential genes
(2004-12)Most cells on earth exist in a quiescent state. In yeast, quiescence is induced by carbon starvation, and exit occurs when a carbon source becomes available. To understand how cells survive in, and exit from this state, ... -
Asymmetric oxidation of 2-(arylsulfenyl)pyrroles
(2008-07)The asymmetric oxidation of prochiral 2-(arylsulfenyl)pyrroles has been investigated. A marked electronic effect within the substrate significantly influenced the degree of enantioselectivity obtained, with very high enantio ... -
Synthesis of natural products containing the pyrrolic ring
(2010)This review provides an overview of the synthetic chemistry that has been utilised to prepare natural products containing a pyrrolic ring. -
Self-assembly of novel trimers using dipyrromethene ligands
(1999-04)Ligands comprising two dipyrromethene units linked at the beta-position have been used to prepare trimeric complexes with Zn-II and Co-II; the structure of the Zn-II complex is confirmed by X-ray analysis. -
Isolation and characterization of a novel tetrahydro-[2,2 ']bipyrrolyl dimer as an impurity from a Knorr reaction
(2004-09)A novel dimer, tetraethyl 2,2',3,3'-tetramethyl-1,1',2,2'-tetrahydro-4H,4'H-2,2'-bipyrrolyi-5,5,5',5'-tetracarboxylate, has been isolated as an impurity (0.4% yield) from a Knorr reaction for the synthesis of ... -
Chloride anion transport and copper-mediated DNA cleavage by C-ring functionalized prodigiosenes
(2007)A new class of prodigiosenes with stability-enhancing functionalities appended to the C-ring were found to transport chloride anions through liposomal membranes, as well as to induce copper-mediated DNA cleavage. -
Investigations into the nucleophilic meso-substitution of F-BODIPYs and improvements to the synthesis of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene.
(2011)A series of three F-BODIPYs, with varying levels of steric crowding about the meso-position were selected to investigate nucleophilic meso-substitution of F-BODIPYs. The synthesis of one of these F-BODIPYs, 4,4-difluor ... -
Synthesis of dipyrrins bearing chirality adjacent to the conjugated skeleton - Electron-poor pyrroles exhibit dramatically reduced nucleophilicity
(2008-10)With the aim of furthering our investigations into the asymmetric complexation of dipyrrinato ligands, a dipyrrin bearing a stereogenic centre directly adjacent to the conjugated skeleton was synthesized. The electron- ... -
Heteroleptic zinc dipyrromethene complexes
(2006-03)H-1 NMR spectroscopy has been used to study the complexation of a per-alkyl dipyrromethene with zinc acetate. An intermediate, assigned to be the heteroleptic Zn(dipyrromethene) (acetate) complex, is observed under titration ... -
Synthesis of heteroleptic pyrrolide/bipyridyl complexes of ruthenium(II)
(2012-08)The synthesis and characterization of the first heteroleptic pyrrolide/2,2'-bipyridyl complexes of ruthenium(II) are reported. Pyrroles substituted at the 2-position with X = O functionality react with Ru(bipy)(2)Cl-2.2H(2)O ...