Halide exchange in [NiCl4]2− refers to the process where halide ligands in the nickel(II) tetrahalide complex are substituted by other halide ions. This process is significant because it demonstrates how ligands can be replaced without altering the overall charge or oxidation state of the central metal ion, which in this case is nickel. The square planar geometry of the complex plays a crucial role in determining how these substitutions occur and their kinetics.
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