A　new　alum　in　ophosphite　(H(4)bape)(0.5)[AI(OH)(HPO3)(2)]　has　been　synthesized　under　hydrothermal　conditions　and　its　structure　was　determined　by　single-crystal　X-ray　diffraction　(bape　=　N,N＇-bis(2-aminopropyl)ethylenediamine).　This　compound　crystallizes　in　the　triclinic　system　with　the　space　group　P!　(No.　2),　a　6.919(2)　angstrom,　beta　=　8.704(2)　angstrom,　c　=　9.786(2)　angstrom,　alpha,　=　77.74(3)＇,　beta　72.43(3)＇,　gamma　=　72.52(3)＇,　V　=　531.08(2)　angstrom(3),　Z　=　2.　The　structure　consists　of　distorted　octahedral　A10(6)　and　pseudo　pyramidal　HP03,　which　are　connected　by　vertex　oxygen　atoms　to　form　a　chainlike　framework　with　a　Al/P　ratio　of　1/2.　The　presence　of　ID　infinite　Al-O-Al　linkage　in　the　framework　is　noteworthy.　The　organic　templates　are　fully　protonated　and　interact　with　the　aluminophosphite　chains　through　extensive　hydrogen　bonds　to　form　a　3D　supramolecular　network.