A　novel　ketone-functionalized　carbazolic　porous　framework　named　PBPMCz　is　presentedfor　fluorometric　determination　of　p-nitroaniline　(PNA).　PBPMCz　was　prepared　by　FeCl3-promoted　oxidative　coupling　polymerization　of　1,3,5-tris((4-(9H-carbazol-9-yl)phenyl)methanone-1-yl)benzene.　The　polymer　possesses　a　BET　surface　area　ofabove　907　m(2).g(-1)　with　a　pore　volume　of　0.72cm(3).g(-1).　Compared　to　the　ketone-free　framework,　the　green　fluorescence　of　the　probe　PBPMCz　is　more　strongly　quenched　by　PNA.　Figures　of　merit　include　(a)　excitation/emission　wavelengths　of　366/540nm;　(b)　a　Stern-Volmer　constant　(K-sv)　of　2.2x10(4)M(-1),　and　(c)　a　detection　limit　of　1.1M.　Furthermore,　PBPMCz　shows　different　quenching　behaviors　of　PNA　compared　with　o-nitroaniline　and　m-nitroaniline.　The　excellent　performance　of　the　fluorescent　probe　is　ascribed　to　the　abundant　carbazole　sites　and　ketone　groups　in　PBPMCz.　These　facilitate　the　electron　transfer　and　hydrogen-bonding　interactions　between　PNA　and　the　polymer.　[GRAPHICS]