Solubilization　of　pyrene　in　aqueous　micellar　solutions　of　quaternary　ammonium　gemini　surfactants　C12-s-C12s2Br　has　been　examined　by　UV　spectra　and　steady　fluorescence　spectra　at　30　°C.　The　results　showed　that　pyrene　molecules　were　incorporated　in　the　palisade　layers　of　the　micelles　and　interacted　with　the　quarterary　ammonium　head　groups　through　cation-π　interaction,　resulting　in　red　shift　of　the　UV　absorption　spectrum.　C12-s-C12s2Br　(s　=　3,　4,　6)　micelles　have　stronger　ability　for　solubilization　of　pyrene　than　conventional　surfactant　C12TABr　micelles.　With　increasing　spacer　length　of　C12-s-C12s2Br,　the　micelles　become　more　adaptable　to　solubilizing　pyrene,　which　even　forms　the　dimers　as　in　the　case　of　s　=　3,　4,　6,　while　pyrene　solubilizes　in　the　micelles　(s　=　2)　mainly　in　single-molecule　form　due　to　the　more　compact　structure　of　the　micelle　in　comparison　with　that　at　s　＞　2.　©　2006　Elsevier　Inc.　All　rights　reserved.