To investigate the performance of XMS-CASPT2 analytical gradients in describing the salient features of copper corrole geometries, XMS-CASPT2 optimizations were performed using a (4e,5o) active space. The S 0 , S 1 , and T 0 states were optimized for the unsubstituted copper corrole while the S 0 and T 0 states were optimized in the triphenyl copper corrole.