Solubilization　of　pyrene　in　aqueous　micellar　solutions　of　quaternary　ammonium　gemini　surfactants　C-12-S-C-12　center　dot　2Br　has　been　examined　by　UV　spectra　and　steady　fluorescence　spectra　at　30　degrees　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-pi　interaction,　resulting　in　red　shift　of　the　UV　absorption　spectrum.　C-12-S-C-12　center　dot　2Br　(s　=　3,　4,　6)　micelles　have　stronger　ability　for　solubilization　of　pyrene　than　conventional　surfactant　C(12)TABr　micelles.　With　increasing　spacer　length　Of　C-12-s-C-12　center　dot　2Br,　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.　(c)　2006　Elsevier　Inc.　All　rights　reserved.