Coordination Chemistry IV - Chapter 12

Reactions and Mechanisms Lab

Diagnose substitution mechanisms, interpret rate laws, and predict stereochemical outcomes.

Session mode

Adaptive mode
Rigor mode

Focus

  • Rate laws and mechanism fingerprints
  • D / I / A pathways
  • Octahedral vs square planar stereochemistry
  • Experimental clues

Mechanism rules

  • D: rate independent of entering ligand, 5-coordinate intermediate.
  • A: rate depends on entering ligand, 7-coordinate transition state.
  • I: partial dependence, no full intermediate.
  • Square planar substitutions are typically associative.

Square planar associative TS

Square planar associative mechanism

Octahedral stereochemistry

Octahedral stereochemistry outcomes
Rate Law Detective D / I / A

Rate = k[ML5X]

Determine the dominant substitution mechanism.

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