A Breathing Hybrid Organic–Inorganic Solid with Very Large Pores and High Magnetic Characteristics

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.