CHEM 724- Inorganic Structure and Bonding
Course Outline & Lecture Notes
Molecular Geometrys: Point Group &
Symmetry Elements
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Chemistry & Science Organizations
Traditional Inorganic Chemistry Resources
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This web page was last edited on: 08/25/99
Gallery of Solid State Structures:
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Copper: This cubic closest packed structure shows the ABCABC... pattern of packed spheres. The unit cell is face centered cubic.
Gold: Gold shows a hexagonal closest packed structure with an ABABAB... repeating pattern.
Rock Salt (NaCl): The NaCl structure consists of closest packed Cl- ions with the Na+ ions filling the octahedral holes. The coordination numbers of both the Na+ and Cl- ions is six.
Wurtzite (ZnS): This lattice consists of hexagonal closest packed sulfide ions with the Zinc ions occupying 1/2 of the tetrahedral holes.
Zinc blende (ZnS): This polytrope of ZnS consists of cubic closest packed sulfide ions (contrast to hexagonal closest packed in Wurtzite). The zinc ions again fill 1/2 of the tetrahedral holes.
Fluorite (CaF2): In fluorite, it is the cation (Ca2+) which forms a cubic closest packed layer. The flouride ions fill all of the tetrahedral holes. The coordination number of Ca2+ is eight.
Rutile (TiO2): The rutile structure consists of hexagonal closest packed oxygen atoms with the Ti4+ ions occupying 1/2 of the octahedral holes. Notice the coordination number of Ti4+ is six and that of oxygen is three.
CsCl Latice: The CsCl latice is based on a body centered cubic unit cell (either Cs+ in the middle of 8 Cl- ions or Cl- in the middle of 8 Cs+ ions). Consequently, the coordination number of each ion is eight.
CsCl Unit Cell: Unit cell showing Cs+ in the middle of a cube surrounded by four chloride ions.
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