Syntheses, crystal structure and thermal behavior of poly[di-μ-bromido-μ-2,3-di-methyl-pyrazine-κ2 N 1:N
1Institut für Anorganische Chemie, Universität Kiel, Max-Eyth.-Str. 2, 24118 Kiel, Germany.
Abstract:
The title compound, [CdBr2(C6H8N2)] n , was prepared by the reaction of cadmium bromide with 2,3-di-methyl-pyrazine in aceto-nitrile. Powder X-ray diffraction (PXRD) indicated that a pure phase had been obtained. The asymmetric unit consists of one Cd cation located on a center of inversion, one 2,3-di-methyl-pyrazine ligand situated on a twofold rotation axis and one bromide anion in a general position. In the extended structure, the cadmium cation is octa-hedrally coordinated by four bridging bromide anions and two bridging 2,3-di-methyl-pyrazine coligands. The cations are linked via common bromide-ion edges into [010] chains that are further connected into (100) layers by the bridging 2,3-di-methyl-pyrazine coligands. Measurements using thermogravimetry and differential thermoanalysis reveal that the compound decomposes in two separate steps in which a more 2,3-di-methyl-pyrazine-deficient compound is formed, which according to PXRD measurements is crystalline.
More Related Videos
Related Concept Videos
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...


