What happens when the world of molecules meets the frontier of electronics? This book explores this dynamic intersection, where charge transport is no longer confined to silicon wafers but is instead mediated by individual molecules bridging macroscopic electrodes.Originally envisioned as a solution to the limits of semiconductor miniaturization, molecular electronics has evolved into a rich, multidisciplinary field. This book investigates the electronic, optical, chemical, and materials properties of molecular junctions—systems where molecules act as the active components of electronic devices.Focusing on the transformative role of metal complexes, this volume expands the traditional organic framework of molecular electronics. Readers will discover how the inclusion of metal centres introduces new dimensions of spin, magnetism, redox activity, and structural versatility, reshaping our understanding of charge transport at the nanoscale.From foundational mixed-valence models to cutting-edge experimental and computational studies, this book offers a comprehensive overview of intramolecular charge transport. It is an essential resource for researchers and students seeking to understand the current state and future potential of metal complex-based molecular electronics.