A　new　two-dimensional　silver(I)-iodide　coordination　architecture　[(dbp　•　H2)1.5(Ag6I9)]　n　(1)　(dbp　=　N,N′-dibutyl-piperazine)　templated　by　appropriate　cation　has　been　constructed　and　structurally,　thermally　and　optically　characterized.　The　compound　crystallizes　in　monoclinic,　space　group　P2(1)/n,　a　=　12.198(2)　Å,　b　=　14.464(3)　Å,　c　=　28.108(6)　Å,　β　=　91.69(3)°,　V　=　4957.0(17)　Å3,　Z　=　4,　R　1　=　0.0576　and　wR　2　=　0.1794[IǍ　>　2σ(I)].　The　inorganic　moiety　of　1　presents　two-dimensional　arrangement　that　results　from　the　apexes　and　edges-sharing　of　AgI4　tetrahedrons.　Electrostatic　interactions　between　organic　countercations　and　inorganic　layers　are　presented　and　contribute　to　the　crystal　packing.　Optical　limiting　measurement　indicates　that　1　possesses　optical　limiting　activity.　©　2006　Springer　Science+Business　Media,　Inc.