Spin crossover behavior in coordination compounds has attracted a great deal of interest from researchers for its potential applications in displays, sensors, data storage devices, and computer processing. Our lab has previously described the synthesis and structure of a five-coordinate cobalt complex where the spin crossover behavior can be controlled electrochemically. Herein, we examine the influence ligands such as pyridine, bromide, and imidazole on the redox coupled spin crossover behavior of this complex. Ligand binding and the subsequent change in spin state is associated with a change in the complex’s absorption profile and electrochemical behavior. Once a ligand is bound to the metal center a significant cathodic shift in reduction potential is observed. This shift correlates to the strength of the sigma donor interaction between the ligand and the metal. By varying the guest ligand we have established a correlation for the control of the redox coupled spin crossover behavior of this complex, allowing us to tune these interactions for specific applications.

Ligand dependent redox coupled spin crossover of a five coordinate cobalt salen

ACS Spring Meeting 2021

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