“…23 The crystalline MIL-100 structure has been demonstrated to support a variety of other metal centres (such as Al, Cr, V, Sc, Ti, Mn, In and Ga) in addition to the Fe analogue. 20,[24][25][26][27] The formation of MIL-100 (Al) is reported to occur via successive formation of Al 1 BTC, Al 2 BTC and then Al 2 BTC 2 intermediates, elucidated through in situ 27 Al NMR spectroscopy. 28,29 However, it is known that the chemistry of Al and Fe in solution are quite different and so their mechanisms are likely to differ.…”