Phenanthroline　derivative,　4,5-diazafluoren-9-one(dafone),　was　introduced　into　lead　iodine　hybrid　to　synthesize　a　new　hybrid　[Pb2I　4(dafone)2]n　(1),　in　which　each　lead　atom　adopts　a　distorted　octahedral　coordination　and　presents　a　one-dimensional　polymer　by　edge-sharing　mode.　Due　to　the　presence　of　O　acceptor　in　dafone,　C-H⋯O　hydrogen　bonds　can　be　observed　and　contribute　to　the　formation　of　2-D　layer.　Experimental　and　theoretical　optical　property　investigation　indicate　that　1　possesses　semiconductor　property.　Specially,　DFT　calculation　suggests　that　1　displays　a　reduced　band　gap　(1.36　eV),　which　is　assigned　to　a　more　dispersed　LUMO　band　compared　with　[Pb2I4(phen)　2]n　and　[Pb2I4(bipy)　2]n.　©　2010　Elsevier　B.V.　All　rights　reserved.