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Structural Chemistry (structural + chemistry)
Selected AbstractsTitelbild: [An(H2O)9](CF3SO3)3 (An=U,Cm, Cf): Exploring Their Stability, Structural Chemistry, and Magnetic Behavior by Experiment and Theory (Angew. Chem.ANGEWANDTE CHEMIE, Issue 36 201036/2010) Empfindlich und doch stabil: Einfach hergestellte und sehr gut lösliche Actinoid(III)-Salze sind als Vorstufen für eine Actinoidkomplexchemie von großem Interesse. P. Lindqvist-Reis et,al. schildern in der Zuschrift auf S.,6487,ff., wie [An(H2O)9]3+(CF3SO3)3 -Salze (An=U,Cm, Cf) direkt aus wässriger Lösung erhalten werden können , ein bemerkenswertes Ergebnis angesichts der extremen Oxidationsempfindlichkeit von UIII - und NpIII -Salzen. Sie diskutieren außerdem den Einsatz dieser Salze als Modelle für hydratisierte An3+ -Ionen in Lösung. [source] [An(H2O)9](CF3SO3)3 (An=U,Cm, Cf): Exploring Their Stability, Structural Chemistry, and Magnetic Behavior by Experiment and Theory,ANGEWANDTE CHEMIE, Issue 36 2010Christos Apostolidis Dr. Lanthanoid-artig: Röntgenbeugung und DFT-Studien ergaben, dass die Ionen [An(H2O)9]3+ der Actinoide U3+,Cf3+ in Kristallen ihrer Triflatsalze dieselbe Struktur und elektrostatische Bindung wie ihre Lanthanoid-Gegenstücke La3+,Eu3+ aufweisen. Zudem zeigte sich, dass die Neunfachkoordination in Lösung bei den leichteren Elementen weitgehend erhalten ist (siehe Bild). [source] ChemInform Abstract: Synthesis and Structural Chemistry of La18Li8Rh4MO39 (M = Ti, Mn, Ru).CHEMINFORM, Issue 42 2010Peter D. Battle Abstract The title compounds are synthesized by solid state reactions of stoichiometric mixtures of La2O3, Rh2O3, MO2 (M: Ti, Mn, Ru), and a 50% excess of Li2CO3 (800 °C, 12 h). [source] ChemInform Abstract: Structural Chemistry and Magnetic Properties of Ln18Li8Rh5-xFexO39 (Ln: La, Nd).CHEMINFORM, Issue 36 2010Peter D. Battle Abstract The title compounds (0.5 , x , 5) are synthesized by solid state reactions of stoichiometric mixtures of the metal(III) oxides and a 50% excess of Li2CO3 (air, 800 °C, 12 h; 1000 °C, 1 h). [source] Structural Chemistry of an n = 1 Member of the Ruddlesden,Popper Srn+1 (Co0.5Ta0.5)nO3n+1 Homologous Series: Sr4CoTaO8.CHEMINFORM, Issue 30 2007Khalid Boulahya Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Structural Chemistry of Ln2BaLiRuO7 (Ln: La, Pr).CHEMINFORM, Issue 25 2006Peter D. Battle Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Structural Chemistry and Physical Properties of Ternary Compounds Ln6Ni15As10, Ln: Y, Sm, Gd, Tb, Dy.CHEMINFORM, Issue 23 2006Volodymyr Babizhetskyy Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Structural Chemistry, Magnetism and Electrical Properties of Binary Pr-Silicides.CHEMINFORM, Issue 14 2003N. Pinguet Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Structural Chemistry of Polycyclic Heteroaromatic Compounds.CHEMINFORM, Issue 4 2002Part 12. Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Constitution, Structural Chemistry and Magnetism in the Ternary System Ce,Ag,Si.CHEMINFORM, Issue 33 2001Edgar Cordruwisch Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Structural Chemistry, Magnetism and Electrical Properties of Binary Nd Silicides.CHEMINFORM, Issue 20 2001P. Boulet Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Tadeusz Marek Krygowski,from aromaticity through X-ray crystallography to interpretative structural ChemistryJOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 10 2003Günter Häfelinger First page of article [source] New Polar Pyrazolylborate Ligands and Their Basic Zinc Complex ChemistryEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 19 2006Cristina Pérez Olmo Abstract By refinement of Trofimenko's procedures, four new tris(pyrazolyl)borate (Tp) ligands bearing pyridyl and carboxamide substituents at the 3-positions of the pyrazole rings, were obtained. Two of them were identified by structure determinations of their potassium salts. Their coordinative properties were explored by preparing Tp*Zn-X complexes, with X = Cl, Br, I, NO3, OAc, phenolate, thiophenolate and diorganophosphate, including the cationic complexes [Tp*Zn·L]+ with L = methanol and pyrazole. From the spectra and structure determinations of these complexes it has become evident that the polar Tp* ligands favor coordination numbers higher than four for zinc, either by inducing bidentate coordination of the coligands X and L, using the carboxamide oxygen atoms for coordination, or by linking two Tp*Zn-X units through the pyridyl nitrogen atoms. As a result, the structural chemistry of these complexes is quite varied, and includes coordination dimers and polymers.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] Implementing molecular connectivity theory, a basic tool in modeling drugsJOURNAL OF PHARMACEUTICAL SCIENCES, Issue 8 2007Lionello Pogliani Abstract The concepts of chain graph, general graph, and complete graph have been used to implement the graph framework of molecular connectivity (MC) theory. Some concepts of this theory have been addressed using "external" theoretical concepts belonging mostly to quantum or structural chemistry, with no direct counterpart in graph theory. Thus, while the concept of chain graph can be used to tackle the cis-trans isomerism problem, the concept of pseudograph, or general graph can be used to tackle the description of the sigma -, pi -, and nonbonding n -electrons. The concept of complete graph can instead be used to tackle the electron core problem of the atoms of a molecule. Graph concepts can also be used to tackle the problem of the hydrogen contribution in hydrogen depleted graphs, which are encoded by the aid of a perturbation parameter, which differentiates between compounds with similar hydrogen-suppressed chemical graphs, like the graphs of CH3F and BH2F. These concepts have allowed redesign of a central parameter of MC theory, the valence delta, giving MC indices with improved model quality as exemplified here with different properties for each treated topic. © 2007 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 96:1856,1871, 2007 [source] Multiplicative congruential generators, their lattice structure, its relation to lattice,sublattice transformations and applications in crystallographyACTA CRYSTALLOGRAPHICA SECTION A, Issue 6 2009Wolfgang Hornfeck An analysis of certain types of multiplicative congruential generators , otherwise known for their application to the sequential generation of pseudo-random numbers , reveals their relation to the coordinate description of lattice points in two-dimensional primitive sublattices. Taking the index of the lattice,sublattice transformation as the modulus of the multiplicative congruential generator, there are special choices for its multiplier which induce a symmetry-preserving permutation of lattice-point coordinates. From an analysis of similar sublattices with hexagonal and square symmetry it is conjectured that the cycle structure of the permutation has its crystallographic counterpart in the description of crystallographic orbits. Some applications of multiplicative congruential generators in structural chemistry and biology are discussed. [source] The weak hydrogen bond in structural chemistry and biology.ACTA CRYSTALLOGRAPHICA SECTION A, Issue 3 2000By Gautam R. Desiraju, Thomas Steiner. First page of article [source] | ||||||||||