Acquiring　adsorbents　capable　of　effective　radioiodine　capture　is　important　for　nuclear　waste　treatment;　however,　it　remains　a　challenge　to　develop　porous　materials　with　high　and　reversible　iodine　capture.　Herein,　we　report　a　porous　self-assembly　constructed　by　a　cup-shaped　Pd-II　complex　through　intermolecular　p.　.　.p　interactions.　This　self-assembly　features　a　cubic　structure　with　channels　along　all　three　Cartesian　coordinates,　which　enables　it　to　efficiently　capture　iodine　with　an　adsorption　capacity　of　0.60　g　g(-1)　for　dissolved　iodine　and　1.81　g　g(-1)　for　iodine　vapor.　Furthermore,　the　iodine　adsorbed　within　the　channels　can　be　readily　released　upon　immersing　the　bound　solid　in　CH2Cl2,　which　allows　the　recycling　of　the　adsorbent.　This　work　develops　a　new　porous　molecular　material　promising　for　practical　iodine　adsorption.