CH1012
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10
4-COORDINATE COMPLEXES I
Four-coordinate metal complexes  can have either tetrahedral or square-planar stereochemistries and, in fact, both types are quite common. 
• On purely electrostatic grounds, one would expect that 4-coordinate complexes would always assume the more symmetrical tetrahedral stereochemistry as this enables the ligands (bond pairs) to be separated by the maximum distance.
• eg. the d10-metal ions adopt this geometry