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Coordination_Principle_F10

Coordination_Principle_F10 - (note this is R c to the...

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1 Coordination Principle GLY 4200 Fall, 2010
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2 Electrostatic Attraction Anions and cations cluster together because they are attracted electrostatically The clusters form coordination arrays
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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
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4 Coordination Number The number of coordinated ions around a central ion is known as the coordination number (CN)
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5 Radius Ratio The radius ratio is the ratio of the cation
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Unformatted text preview: (note: this is R c ) to the anion (R a ) 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 R c /R a CN Configuration <0.155 II linear 0.155-0.225 III trigonal 0.225-0.414 IV tetragonal 0.414-0.732 IV square planar 0.414-0.732 VI octahedral 0.732-1.000 VIII cubic 8 Linear 9 Trigonal Planar 10 Tetrahedral 11 Square Planar 12 Octahedral 13 Cubic 14 Radius Ratio Computation...
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