The　reaction　of　a　flexible　monothioether　ligand,　2-[(o-pyridyl)-sulfinylmethyl]-pyridine　(L),　with　CuI　leads　to　the　formation　of　a　novel　complex　[CU4I4(L)(2)]　(1),　which　has　been　characterized　by　elemental　analyses,　IR　spectroscopy,　and　X-ray　crystallography.　Single-crystal　X-ray　analyses　show　that　complex　1　contains　two　kinds　of　crystallographic　independent　complex　molecules,　and　both　of　them　have　similar　tetranuclear　structures　with　a　distorted　chair-like　Cu4I4　skeleton.　In　the　packing　mode　of　complex　1,　there　exist　S...　S　weak　interactions　between　one　kind　of　tetranuclear　molecules　and　intermolecular　pi-pi　contacts　in　two　kinds　of　tetranuclear　molecules.　These　weak　interactions　not　only　stabilize　the　structure　of　the　complex,　but　also　further　link　the　tetranuclear　molecules　into　a　high-dimensional　supramolecular　architecture.　(c)　2005　Elsevier　B.V.　All　rights　reserved.