Though nickel speciation was elucidated in experiments above (Fig. ), these were under the conditions used in our previous methodology study. Since DBU is a known ligand that can change the speciation under our newly developed conditions, we hypothesized that the previously identified Ni(II) complexes may not be the species present in the highest concentration under our new conditions. Indeed, upon adding DBU to a mixture in which the bis-ligated nickel complex is the dominant species (Fig. to Fig. ), there was a 112 nm hypsochromic shift and an increase in molar absorptivity. The increase in molar absorptivity likely arises from the formation of a 5-coordinate complex from one DBU displacing both bromides to form the complex [Ni(II)L2DBU]Br2 (See SI for additional discussion).