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. One way to enhance the bistability of spin-crossover systems is to couple the transition to redox changes in a coordination complex. We have previously described the synthesis and structure of a five-coordinate cobalt complex that undergoes redox-coupled spin-crossover through ligand coordination. The Co(II) state of this complex is stable in the five-coordinate, high-spin configuration, whereas oxidation to Co(III) leads to a low-spin, six-coordinate species following ligand binding. Herein, we examine the influence ligands such as substituted pyridines and imidazole on the redox-coupled spin-crossover behavior and redox bistability of this complex. 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.

Controlling redox bistability and redox coupled spin crossover behavior in cobalt coordination complexes

ACS Fall 2021

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