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Coordination Principle

Coordination Principle. GLY 4200 Fall, 2012. Electrostatic Attraction. Anions and cations cluster together because they are attracted electrostatically The clusters form coordination arrays. Ionic Bonding.

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Coordination Principle

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  1. Coordination Principle GLY 4200 Fall, 2012

  2. Electrostatic Attraction • Anions and cations cluster together because they are attracted electrostatically • The clusters form coordination arrays

  3. Ionic Bonding • The coordinated ions always cluster about the coordinating ion in such a way that their centers lie at the apices of a polyhedron • For bonding that is non-ionic, the same general principles hold

  4. Coordination Number • The number of coordinated ions around a central ion is known as the coordination number (CN)

  5. Radius Ratio • The radius ratio is the ratio of the cation (note: this is Rc) to the anion (Ra) or (R+/R-) • Since anions are almost always larger than cations, the ratio is between zero and one

  6. Fit • Perfect • Cation large, pushes anions apart • Cation small, rattles around (unstable)

  7. Common Configurations

  8. Linear

  9. Trigonal Planar

  10. Tetrahedral

  11. Square Planar

  12. Octahedral

  13. Cubic

  14. Radius Ratio Computation

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