Abstract
The design and synthesis of solid-state materials constructed from molecules has emerged as an important frontier of materials research. Molecular materials promise an unparalleled opportunity for systematic manipulation of solid-state properties and functions by using molecular design principles and capitalizing on the versatility of organic synthesis. Furthermore, the use of molecular components may produce considerable economic benefits, whether by reducing fabrication cost or through increases in performance. The articles in this issue of MRS Bulletin cover recent discoveries and developments based on materials with properties and functions that hinge on the characteristics of their molecular constituents. These materials promise significant advances in several technologies of substantial commercial interest, including organic light-emitting diodes, nonlinear optics, gas separations, chiral separations, and molecular magnets.