 
         
         Abstract
         
         
         
            
            
            
Nickel-catalyzed cross-coupling and photoredox catalytic reactions has found widespread
               utilities in organic synthesis. Redox processes are key intermediate steps in many
               catalytic cycles. As a result, it is pertinent to measure and document the redox potentials
               of various nickel species as precatalysts, catalysts, and intermediates. The redox
               potentials of a transition-metal complex are governed by its oxidation state, ligand,
               and the solvent environment. This article tabulates experimentally measured redox
               potentials of nickel complexes supported on common ligands under various conditions.
               This review article serves as a versatile tool to help synthetic organic and organometallic
               chemists evaluate the feasibility and kinetics of redox events occurring at the nickel
               center, when designing catalytic reactions and preparing nickel complexes.
            
            1 	Introduction
            
            1.1 	Scope
            
            1.2 	Measurement of Formal Redox Potentials
            
            1.3 	Redox Potentials in Nonaqueous Solution
            
            2 	Redox Potentials of Nickel Complexes
            
            2.1 	Redox Potentials of (Phosphine)Ni Complexes
            
            2.2 	Redox Potentials of (Nitrogen)Ni Complexes
            
            2.3 	Redox Potentials of (NHC)Ni Complexes
            
         
         Key words
redox potentials - nickel - cyclic voltammetry - reduction - oxidation