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Type Compounds (type + compound)

Distribution by Scientific Domains

Chemistry	80%

Selected Abstracts

ChemInform Abstract: First Synthesis of Propano-dibenzo[1,3]dioxocin Type Compounds from Condensation of p-Substituted Phenol Derivatives with Glutaraldehyde in Trifluoroacetic Acid.

CHEMINFORM, Issue 37 2002
Ali Rahmatpour
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: Chemical Reactivity of Positions N-3, C-5 and C6 -Methyl Group in Biginelli Type Compounds (IV) and Synthesis of New Dihydropyrimidine Derivatives.

CHEMINFORM, Issue 7 2002
H. Namazi
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]

Semiconducting half-Heusler and LiGaGe structure type compounds

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 5 2009
Frederick Casper
Abstract Compounds with LiAlSi (half-Heusler) and LiGaGe structure types have been investigated by means of band structure calculations. The LiAlSi structure type is known as the half-Heusler structure type, whereas LiGaGe is a closely related hexagonal variant. A remarkable feature of some XYZ half-Heusler compounds with 8 and 18 valence electrons is, that despite being composed of only metallic elements, they are semiconductors. More than 100 semiconducting compounds within these structure types are known. LiGaGe compounds have an additional degree of freedom, namely the degree of puckering of the layers. These compounds can become semiconducting at a certain degree of puckering. Half-metallic behavior is rarely found in this structure type. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Structural stability and formability of ABO3 -type perovskite compounds

ACTA CRYSTALLOGRAPHICA SECTION B, Issue 6 2007
Huan Zhang
On the basis of the bond-valence model (BVM) and structure-map technology, the structural stability and formability of ABO3 -type perovskite compounds were investigated in 376 ABO3 -type compounds. A new criterion of structural stability for ABO3 -type perovskite compounds has been established by the bond-valence calculated tolerance factors, which are in the range 0.822,1.139. All global instability indices for ABO3 -type perovskite compounds are found to be less than 1.2,v.u. (valence units) and increase with a decrease in oxidation state of the B cations (i.e. structural stability in the formation of an ideal cubic perovskite follows the order A+B5+O3 -type > A2+B4+O3 -type > A3+B3+O3 -type). Three new two-dimensional structure maps were constructed based on the ideal A,O and B,O bond distances derived from the BVM. These maps indicate the likelihood of particular perovskite compounds being formed. The present work enables novel perovskite and perovskite-related compounds to be explored by screening all the possible elemental combinations in future crystal engineering. [source]

Octakis(dimethylammonium) hexa-,2 -chlorido-hexachloridotrinickelate(II) dichloride: a linear trinickel complex with asymmetric bridging

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 10 2009
Allison Gerdes
The title compound, (C2H8N)8[Ni3Cl12]Cl2, crystallizes as linear [Ni3Cl12]6, complex anions with inversion symmetry, separated from one another by dimethylammonium cations and noncoordinated chloride ions. The gross structural arrangement of the trinickel complex is as a segment of face-sharing NiCl6 octahedra similar to the (NiCl3)n chains of CsNiCl3 -type compounds. On closer inspection, the regular coordination geometry of the complex consists of octahedral NiCl6 in the center linked by two symmetrically bridging chloride ions to square-pyramidal NiCl5 on each end. A long semicoordinate bond is formed by each of the terminal NiII cations, to give a 5+1 coordination geometry and form an asymmetric bridge to the central NiII cation. The dimethylammonium cations surround the complex with an extensive hydrogen-bonding network, linking the complex to the noncoordinated chloride ions. Asymmetric bridging in the complex arises from short hydrogen bonds from the same dimethylammonium cation to the apical and asymmetric bridging chloride ions, causing the complex to scissor outward. [source]