Abstract
Cage clusters are a discrete chemically and topologically diverse family of molecule-based functional materials. Presented here are two isostructural M(48) (M = Co(II) for LSHU01, Ni(II) for LSHU02) cage clusters with a merohedral icosahedral cage structure featuring 12 M(4)-TC4A (H(4)TC4A, p-tert-butylthiacalix[4]arene) second building units as vertices and 18 asymmetric 5-(1H-tetrazol-1-yl)isophthalate ligands as faces. They are the highest-nuclearity cage compounds of Co(II) and Ni(II). The activated Co(48) cage exhibited high selectivity in the sorption of C(3)H(8) over CH(4) under ambient conditions. Frequency response experiments indicated that the extrinsic voids and matrix interface of the activated crystalline samples are primarily responsible for the observed gas adsorption performance.