What appear to be smooth hexagonal rods in this image are metal–organic frameworks (MOFs)—a captivating class of highly structured porous materials, comprised of inorganic and organic building blocks. Captured in three-dimension is NU-1000, a type of MOF that is comprised of zirconium, carbon, and oxygen. The material was successfully synthesized using a green solvent derived from biorenewable sources, and thus implementing principles from the field of green chemistry. This paves the way for the sustainable synthesis and use of MOFs in potential applications including, but not limited to, wastewater remediation, chemical separations, and gas capture and storage. When synthesized, NU-1000 appears as a bright yellow microcrystalline powder, which is brought out in this image with the yellow highlights surrounding the MOF material.