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Host Compounds (host + compound)

Distribution by Scientific Domains
Chemistry66%

Selected Abstracts

ChemInform Abstract: Hexagonal YFe1-xPdxO3-,: Nonperovskite Host Compounds for Pd2+ and Their Catalytic Activity for CO Oxidation.

CHEMINFORM, Issue 3 2009
Jun Li
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 of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Induced circular dichroism in solid-state inclusion compounds

CHIRALITY, Issue 7 2001
Koichi Tanaka
Abstract In order to measure the circular dichroism (CD) spectrum in the solid state of a chiral compound which has no chromophore, an induced CD spectral method was developed by measuring the spectrum of the inclusion crystal of the chiral compound with a simple achiral aromatic host compound in the Nujol mulls. Chirality 13:347,350, 2001. © 2001 Wiley-Liss, Inc. [source]

Ag+ selection by aza-18-crown-6 ethers N -Substituted on heterocyclic aromatics ,,

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2005
Kiyoshi Matsumoto
Substitution on the nitrogen atom, where necessary by high-pressure SNAr reactions, of aza-18-crown-6 ethers linked to heterocyclic aromatics has extended the number of potential host compounds for Ag+. The complexation of Ag+ by the new compounds has been evaluated by liquid membrane ion transport and ion extraction experiments. The nature of the binding sites of these new host compounds for Ag+ has been assessed, in DMF/D2O (4/1), by 13C nmr titration experiments with AgClO4. [source]

The role of specific interactions in crystalline complex formation.

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 5 2002
10-bis(4-bromophenyl)-, 10-dihydroanthracene with dimethyl sulfoxide, 10-dihydroxy-, Structural, thermochemical analysis of inclusion compounds of cis -, trans -
Abstract Referring to a crucial problem in crystal engineering and co-crystallization of host,guest complexes, whether the non-covalent supramolecular interactions existing in a pre-crystalline solution state may determine the subsequent crystal structure, the particular inclusion properties of host compounds 1, cis - and 2, trans -9,10-bis(4-bromophenyl)-9,10-dihydroxy-9,10-dihydroanthracene, with dimethyl sulfoxide (DMSO) were studied by using x-ray structure analysis and calorimetric methods. Both hosts form crystalline inclusion complexes with DMSO showing 2:3 (1·DMSO) and 1:4 (2·DMSO) host:guest composition. The crystal structure of 1·DMSO (2:3) is dominated by a strong bifurcated acceptor-type H bond interaction involving 1 and one of the DMSO molecules. Titration calorimetric investigations in solution also confirm the formation of a stable 1·DMSO (1:1) complex unit, suggesting that for crystal nuclei of 1·DMSO (2:3) the pre-formed 1:1 host,guest complex is the relevant building block while the additional molecules of DMSO fill lattice voids. In contrast, compound 2 with a trans configuration of the two hydroxy groups gives much weaker complexation with DMSO in solution, which is in agreement with single H-bond interaction, also realized in the crystal structure of the respective inclusion complex. Thermal decomposition (TG,DSC) measurements of the crystalline complexes supply supporting data for these findings. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Photoconductivity of CaGa2S4 single crystals doped with Eu2+ and Ce3+

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2006
Kazuma Hiraguri
Abstract CaGa2S4 compounds doped with rare-earth elements (REE) exhibit luminescence with various colors. The emission process between the transition levels of REE ions has ever been extensively studied. We have measured the photoconductivity (PC) to confirm the locations of the 4f ground levels of the Eu2+ and Ce3+ ions in the band gap of the host compounds of CaGa2S4 for the first time. The estimated values for Eu2+ and Ce3+ are 1.8 eV and 0.95 eV from the top of the valence band of CaGa2S4, respectively. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Aqueous catalysis by novel macromolecule metal complexes with molecular recognition abilities,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 3-4 2001
Edward A. Karakhanov
Abstract A number of water-soluble macromolecular metal complexes on the basis of polyethers, ,-cyclodextrins, calix[4] and calix[6]arenes functionalized by oligoethylene oxide blocks, catechol, ethylendiamine, acetylacetone, 2,2,-dipiridyl, phosphines and nitrile containing groups have been developed. Complexes showed high catalytic activity in aqueous hydroformylation, biphasic Wacker-type oxidation of various higher olefines, alkane oxidation, hydroxylation of benzene and phenol. These catalysts can be multiply reused. The application of host compounds results the extremely selectivities. Copyright © 2001 John Wiley & Sons, Ltd. [source]