Synthesis and Structure of an Unusual New Layered Aluminophosphate Containing Oxalate Groups, [NH3CH2CH2NH3]2.5[Al4H(HPO4)4(H2PO4)2(C2O4)4]

The first example of an aluminophosphate containing organic anions covalently bonded to the framework of the structure is reported; [NH3CH2CH2NH3]2.5[Al4H(HPO4)4(H2PO4)2(C2O4)4] was prepared hydrothermally and adopts a layered structure. The oxalate groups act as bidentate ligands to Al3+and hold the structure together by strong interlayer P-OH–oxalate hydrogen bonds. The structure was solved from synchrotron X-ray diffraction data collected on a very small single crystal, space groupC2/m,a=19.683(4) ?,b=12.360(3) ?,c=16.734(3) ?,=110.51(3)°.