The goal in Volume 4 of Advances in Supramolecular Chemistry remains the same as for previous volumes: to present a broad range of supramolecular science recorded by an international panel of distinguished researchers. Contributions in this volume span the scientific range from electronic device development to novel synthetic receptor molecules to biomimetic ion channels.The true breadth of the supramolecular chemistry field is sometimes overlooked. By their very nature, focused monographs cannot span the range of efforts that include analytical, inorganic, organic, physical, and biochemistry. Even considering the wide range of studies underway, there is some polarization between the biological side of upramolecular science and materials development. It is hoped that the quality of the presentations in this volume will demonstrate that there is original, fascinating, and excellent science on both sides and throughout the field of supramolecular chemistry.