Crystal engineering is an interdisciplinary area that cuts across the traditional subdivisions of chemistry. Fuelled by our increasingly precise understanding of the chemistry and properties of supramolecular systems, interest in the potential of the field has increased rapidly. The topics discussed in the 28 contributions in this book provide a state-of-the-art description of the field and offer new research ideas that, if pursued, will serve to strengthen the field at the interface between supramolecular chemistry and materials science.Proceedings of the NATO Advanced Study Institute, held in Erice, Italy, 11-23 May 1999Crystal engineering is an interdisciplinary area that cuts across the traditional subdivisions of chemistry. Fuelled by our increasingly precise understanding of the chemistry and properties of supramolecular systems, interest in the potential of the field has increased rapidly. The topics discussed in the 28 contributions in this book provide a state-of-the-art description of the field and offer new research ideas that, if pursued, will serve to strengthen the field at the interface between supramolecular chemistry and materials science.Preface; D. Braga, et al. 1. On the Concept of a Single Crystal in Biomineralization; L. Addadi, et al. 2. Introduction to Packing Patterns and Packing Energetics of Crystalline Self-Assembled Structures - Predicting Crystal Structures Using Kitaigorodskii's Aufbau Principle; J. Perlstein. 3. Molecule-Based Magnets; J.S. Miller, A.J. Epstein. 4. Structure Determination by Neutron and Synchroton X-Ray Scattering; H. Fuess. 5. Theory of Intermolecular Interactions; P. Pyykk?. 6. Hydrogen-Bond Assisted Assembly of Organic and Organic-Inorganic Solids; C.B. Aaker?y, D.S. Leinen. 7. Secondary Bonding as a Potential Design Tool for Crystal Engineering; A.G. Orpen. 8. Molecular Packing in Liquids, Solutions, and Crystals: Acetic Acid as a Test Case; A. Gavezzotti. 9. Cl