Extended Data Fig. 6: Construction of the 28-ring channel of calcined ZMQ-1 and transformation of the ZMQ-1 structure by calcination.

a–c, The 28-ring channel is constructed from a wavy layer (in green) and a double butterfly strip (in purple), as viewed along the c axis (a), b axis (b) and a axis (c). The structure of the as-synthesized (d) and calcined (e) ZMQ-1, viewed perpendicular to the extra-large 28-ring channel, showing the 3D 28 × 10 × 10-ring channel system. The locations of the OSDAs in the as-synthesized ZMQ-1 were determined from low-dose cryo-cRED data. The terminal hydroxyl groups condense to form a fully four-connected framework. Colour code: red, terminal oxygen; purple, phosphorus; dark grey, carbon determined by 3D ED data; light grey, carbon not located by 3D ED and added based on chemical information. Only the T···T connections of the framework are shown and H atoms are omitted for clarity.