From Tetrahedral Tetraphosphonic Acids E[p-C6H4P(O)(OH)(2)](4) (E=C, Si) to Porous Cu- and Zn-MOFs with Large Surface Areas

This study describes the porous MOFs Cu2H4STPPA⋅2 H2O (1⋅2 H2O), Zn2H4STPPA (2) and Zn2H4MTPPA (3) obtained using the tetrahedral linkers tetraphenylmethane tetrakis-4-phosphonic acid (H8MTTPA) and tetraphenylsilane tetrakis-4-phosphonic acid (H8STPPA) under solvothermal conditions. X-ray structures reveal 3D frameworks with large assessable voids. The percentage void volumes and the specific BET surface areas of 1 (48.7 %, 794 m2/g), 2 (48.1 %, 565 m2/g) and 3 (51.3 %, 927 m2/g) predicted by molecular simulations are among the highest reported for MOFs derived from phosphonic acids