Two　new　lanthanide-bismuth　heterometallic　hybrids,　[Dy(DMF)(8)](Bi2I9)　(1)　and　[Er(DMF)(8)](Bi2I9)　(2)　(N,N＇-dimethylformamide　(DMF))　have　been　synthesised　by　solution　processes,　which　assume　significance　for　their　first　incorporation　lanthanide　metals　into　bismuth　iodides　to　get　heterometallics.　Two　hybrids　are　isostructures　containing　(Bi2I9)(3-)　halobismuthate　dimers　and　lanthanide　metal　complexes　[M(DMF)(8)](3+)　(M　=　Dy,　Er)　cations,　and　it　is　noteworthy　that　the　dimers　and　lanthanide　metal　complexes　cations　connect　with　each　other　by　C-H　center　dot　center　dot　center　dot　I　hydrogen　bonds　to　achieve　the　structural　extending　from　0-D　to　1-　or　2-D.　Their　absorption　spectra　and　fluorescence＇s　were　discussed,　and　energy　band　gaps　of　2.19　eV　indicate　their　narrow-gap　semiconductor　natures.