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Coordination Principle

2. Electrostatic Attraction. Anions and cations cluster together because they are attracted electrostaticallyThe 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 polyhedronFor

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Coordination Principle

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    1. 1 Coordination Principle GLY 4200 Fall, 2011

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

    3. 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. 4 Coordination Number The number of coordinated ions around a central ion is known as the coordination number (CN)

    5. 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. 6 Fit Perfect Cation large, pushes anions apart Cation small, rattles around (unstable)

    7. 7 Common Configurations

    8. 8 Linear

    9. 9 Trigonal Planar

    10. 10 Tetrahedral

    11. 11 Square Planar

    12. 12 Octahedral

    13. 13 Cubic

    14. 14 Radius Ratio Computation

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