3) obtained using the tetrahedral linkers tetraphenylmethane tetrakis-4-phosphonic acid (H 8 MTTPA) and tetraphenylsilane tetrakis-4-phosphonic acid (H 8 STPPA) 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 m 2 /g), 2 (48.1 %, 565 m 2 /g) and 3 (51.3 %, 927 m 2 /g) predicted by molecular simulations are among the highest reported for MOFs derived from phosphonic acids.

Here we report the first utilization of the novel methane tetra-p-phenylphosphonic acid (MTPPA) ligand for the preparation of metal complexes with Cu­(II). The hydrothermal and solvothermal reactions of tetratopic MTPPA as a bridging ligand in conjunction with the square pyramidal {Cu­(terpy)}2+ and {Cu2(pbterpy)}4+, (where terpy = 2,2′:6′,2″-Terpyridine and pbterpy = 4′,4″″-(1,4-Phenylene)­bis­(2,2′:6′,2″-terpyridine)) as prefixed corner building units have produced one-dimensional [{Cu­(terpy)}2(MTPPA-H5) (MTPPA-H6)]·(4.25H2O)­(H3O) (1) and two-dimensional [{Cu2(pbterpy)}­MTPPA-H4] (2), respectively. The structures were characterized by single crystal X-ray diffraction and TGA.

The structural characterization of tetraphenylmethane tetrakis-4-phosphonic acid (4a) and its closely related Si-analogue tetraphenylsilane tetrakis-4-phosphonic acid (4b) is reported.Crystals of 4a, obtained by crystallization at 165°C from water under hydrothermal conditions, comprise a dense three-fold interpenetrated hydrogen-bonded network. Lower calculated density co-crystals 4b·4 EtOH, attained by recrystallization from ethanol, give rise

The reaction of appropriate copper and vanadium salts with tetratopic methane tetra-p-phenylphosphonic acid (MTPPA) in the presence of 2,2':6':2''-terpyridine (terpy) yielded the three-dimensional bimetallic copper vanadium phosphonate framework [{Cu(terpy)}Cu(VO)(MTPPA-H)]·4HO (1). Terpy has no net contribution to the three-dimensional structure providing a potential platform for void space formation via mold-casting. The structure was characterized by single-crystal X-ray diffraction and thermogravimetric analysis (TGA). Magnetic measurements were performed using a SQUID magnetometer. The crystal structure of the methanol solvate of the free ligand, MTPPA·MeOH, was analysed using Hirshfeld surfaces and fingerprint plots.