Organic-inorganic one-dimensional hybrid aggregates constructed from aromatic-bisphosphonate-functionalized polyoxomolybdates.

Five novel lanthanide-substituted polyoxomolybdates (NH 4 ) 5 Na 3 H 2 [{Ln(H 2 O) 7 } 2 {Mo 5 O 15 (1,4-O 3 PCH 2 C 6 H 4 CH 2 PO 3 )} 4 ]· n H 2 O [Ln = Tb 3+ (1), Ho 3+ (2), Er 3+ (3), Tm 3+ (4), Yb 3+ (5); n = 33, 32, 41, 30, 47] have been prepared in a conventional aqueous solution reaction of ammonium molybdate with Ln 3+ ions and p -xylyenediphosphonic acid. Crystal structure analyses reveal that 1-5 are isomorphic. The prominent architecture characteristic is that their structural units consist of a tetrameric cyclic-shaped [{Mo 5 O 15 (1,4-O 3 PCH 2 C 6 H 4 CH 2 PO 3 )} 4 ] 16- segment stabilized by two [Ln(H 2 O) 7 ] 3+ cations, which are connected to propagate one-dimensional chain by Ln 3+ ions. As is known, compounds 1-5 stand for the first Ln-substituted aromatic-bisphosphonate-functionalized polyoxomolybdates. The solid-state photoluminescence measurement of 1 has been performed at ambient temperature, and it displayed the characteristic emissions of Tb ions based on its 4f-4f transitions. In addition, the magnetic properties of 1-5 compounds show that they all exhibit anti-ferromagnetic interactions.