Organo-metallic analytes for nonaqueous redox flow batteries

The present disclosure features organometallic materials and methods for electrical energy storage. For example, molecular redox-active bis(imino)pyridine ligands and Group 13 metal-bis(imino)pyridine complexes for use as Non-Aqueous Redox Flow Battery (NRFB) analytes are provided. Also provided are NRFBs and electrical energy storage systems comprising Group 13 metal-bis(imino)pyridine complexes as analytes.