The embedding of fluorescent N -methyl-9-acridone into a topological new layered aluminophosphate SYSU-2 by one-pot synthesis

A layered aluminophosphate |C 14 H 11 NO| 2 [Al 4 (HPO 4 ) 4 F 4 (H 2 O) 2 ] (denoted as SYSU-2) with a new topology has been hydrothermally synthesized with N -methyl-9-acridone (NMA) as the organic structure-directing agent. Single-crystal X-ray diffraction analysis reveals that SYSU-2 crystallizes in a triclinic space group P 1̄, with the inorganic sheets stacked in an AA sequence. Hydrogen bonds are responsible for the neutral inorganic–organic layer connection. The layer structure of SYSU-2 is constructed by alternating AlO 4 F 2 octahedra and PO 4 tetrahedra. The topological analysis of SYSU-2 indicates an independent topology. The NMA layers are self-assembled with π–π interaction. SYSU-2 crystals show interesting dual-band emission fluorescence properties compared with NMA crystals. Under 406 nm UV irradiation, SYSU-2 crystals emit yellow light with two emission bands at 477 and 566 nm, while NMA crystals emit blue light with only one band at 473 nm. The differences may be derived from the difference of stacking orders and distance of NMA molecule layers between the two crystals.