L’ambiguïté structurale du composé binominal

Structure cristalline du composé intermétallique Ni18Ge12

Single crystals of octa-deca-nickel dodeca-germanide were grown by chemical transport reaction. The inter-metallic compound crystallizes in a superstructure of the hexa-gonal NiAs type (B8 type). All atoms in the asymmetric unit lie on special positions except one Ni atom (two Ni atoms have site symmetry -6.. and another one has site symmetry .2. while the Ge atoms have site symmetries 32., m.....

Etude structurale et vibrationnelle d’un nouveau composé complexe de cobalt: [Co(imidazole)4Cl]Cl

In the title complex, chlorido-tetra-kis-(1H-imidazole-κN (3))cobalt(II) chloride, [CoCl(C3H4N2)4]Cl, the Co(II) cation has a distorted square-pyramidal coordination environment. It is coordinated by four N atoms of four imidazole (Im) groups in the basal plane, and by a Cl atom in the apical position. It is isostructural with [Cu(Im)4Cl]Cl [Morzyk-Ociepa et al. (2012 ▸). J. Mol. Struct. 1028, ...

Structure cristalline du composé Hg3-xSbx(S+Se)2+xI2-x (x ≃ 0.1)

Single crystals of the mercury chalcohalide Hg3-x Sb x (S+Se)2+x I2-x (x ≃ 0.1) (mercury anti-mony sulfide selenide iodide), were grown by a chemical transport reaction. The structure contains three independent A (Hg/Sb) atoms; each atom is strongly covalently bonded with two X (Se/S) atoms to form approximately linear X-A-X units. The X-A-X units link to form A 4 X 4 rings, which are combined ...

Devant le jury composé de:

· M. Y. Brenier Directeur de Recherches CNRS, Université de Nice-Sophia-Antipolis · M. G. Buttazzo Professeur Università di Pisa · M. G. Carlier Professeur Université Paris-Dauphine · M. J.-A. Carrillo Profesor Investigador ICREA, Universitat Autònoma de Barcelona · M. I. Ekeland Professeur U. Paris-Dauphine et U. of British Columbia · M. P.-L. Lions Professeur Collège de France · M. J.-M. More...

devant le jury composé de: