Ferey's chromium terephthalate MIL-101 is remarkable twice over. As a material: zeotypic giant cages of 29 and 34 angstroms, a Langmuir surface area reported near 5,900 m2/g, and, rare among early MOFs, robust stability in water and acid thanks to inert Cr(III)-oxo trimers. As a method: the structure, with a unit cell of roughly 702,000 cubic angstroms, was too complex for conventional analysis, so the team predicted candidate frameworks computationally with their AASBU approach and matched them to synchrotron powder data.
That computational-prediction-first workflow was quietly revolutionary. It demonstrated that simulation could lead rather than follow synthesis, anticipating today's large-scale hypothetical-MOF screening by nearly a decade. Chemists tend to cite MIL-101 for its pores; methodologists should cite it for its epistemology.
As a workhorse, MIL-101 earned its keep. The coordinatively unsaturated chromium sites left after dehydration made it a favorite catalyst support and amine-grafting platform, and its hydrothermal stability let it survive applications, water sorption cycling, toxic gas capture, liquid-phase catalysis, that dissolved zinc frameworks on contact. It remains among the most-cited MOFs of all time.
Honest limitations: chromium is toxic enough to complicate biomedical or consumer uses, the original synthesis involved HF, which industrial chemists despise, and reported surface areas vary widely across labs, a reproducibility scatter the original short-format paper could not interrogate. Fluorine-free routes and Fe(III) analogues developed later address the first two points. None of this dents the paper's standing: it widened the field's pore-size imagination and its methodological toolkit simultaneously, which very few single papers manage.