Four　uranium(VI)-polycarboxylates　frameworks　with　honeycomb　(6,3)　nets　have　been　assembled　from　solvothermal　systems,　which　contain　different　guest　molecules　(transition　metal　complexes　and　methyl　viologen).　These　compounds　exhibit　photocatalytic　activities　for　the　degradation　of　rhodamine　B.　Interestingly,　the　methyl　viologen-containing　one　possesses　the　highest　efficiency,　which　can　be　attributed　to　the　electron　acceptor　nature　of　methyl　viologen　for　the　stabilization　of　active　peroxide　anions.　©　2014　American　Chemical　Society.