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Breathtaking are the highly magnetic and porous vanadocarboxylates (TN=95 K) MIL-47as (left) and evacuated MIL-47 (right) that exhibit three-dimensional large-pore structures built up from infinite chains of corner-sharing VIIIO4(OH)2 (MIL-47as) and VIVO6 (MIL-47) octahedra linked by rigid terephthalate anions. The reversible adsorption–desorption corresponds to a breathing of the structure. The high TN value results from the combination of magnetic chains with the presence of the π electrons of the terephthalate.
Barthelet et al. (Fri,) studied this question.