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1.  The new ternary phases of La3(Zn0.874Mg0.126)11 and Ce3(Zn0.863Mg0.137)11  
The La3(Zn0.874Mg0.126)11 and Ce3(Zn0.863Mg0.137)11 inter­metallic compounds are isostructural and crystallize in the ortho­rhom­bic La3Al11 structure type. Compared to the structure of La3Al11, in La3(Zn0.874Mg0.126)11, a significant decrease of 11.9% in the unit-cell b axis and and an increase in the other two directions, of 3.6% along a and 5.2% along c, are observed. Such an atypical deformation is caused by the closer packing of atoms in the unit cell due to atom shifts that reflect strengthening of metallic-type bonding.
The new ternary inter­metallic title compounds, namely trilanthanum undeca­(zinc/magnesium), La3(Zn0.874Mg0.126)11, (I), and tricerium undeca­(zinc/magnesium), Ce3(Zn0.863Mg0.137)11, (II), are isostructural and crystallize in the ortho­rhom­bic La3Al11 structure type. These three phases belong to the same structural family, the representative members of which may be derived from the tetra­gonal BaAl4 structure type by a combination of inter­nal deformation and multiple substitution. Compared to the structure of La3Al11, in (I), a significant decrease of 11.9% in the unit-cell b axis and an increase in the other two directions, of 3.6% along a and 5.2% along c, are observed. Such an atypical deformation is caused by the closer packing of atoms in the unit cell due to atom shifts that reflect strengthening of metallic-type bonding. This structural change is also manifested in a significant difference in the coordination around the smaller atoms at the 8l Wyckoff position (site symmetry m). The Al atom in La3Al11 is in a tricapped trigonal prismatic environment (coordination number 9), while the Zn atoms in (I) and (II) are situated in a tetra­gonal anti­prism with two added atoms (coordination number 10).
doi:10.1107/S0108270110002556
PMCID: PMC2855569  PMID: 20203390
2.  2-[(2Z,3E)-2-Hy­droxy­imino-5-phenyl-2,3-dihydro-3-thienyl­idene]-2-phenyl­acetonitrile 
In the crystal structure of the title compound, C18H12N2OS, centrosymmetric dimers are stabilized both by van der Waals inter­actions and by two types of inter­molecular O—H⋯N hydrogen bonds. In addition, an intra­molecular C—H⋯S hydrogen bond is observed. The dihedral angles between the central ring and the two pendant phenyl rings are 7.4 (1) and 45.06 (9)°.
doi:10.1107/S1600536810024955
PMCID: PMC3007389  PMID: 21588254

Results 1-2 (2)