Fluorescent Cd metal-organic frameworks (MOFs), [Cd 2 (dicarboxylate) 2 (NI-bpy-44) 2 ]( dicarboxylate = benzene-1,4-dicarboxylate (1,4-bdc, 1), 2-bromobenzene-1,4-dicarboxylate (Br-1,4-bdc, 2), 2-nitrobenzene-1,4-dicarboxylate (NO 2 -1,4-bdc, 3), biphenyl-4,4'-dicarboxylate (bpdc, 4); NI-bpy-44 = N-(pyridin-4-yl)-4-(pyridin-4-yl)-1,8-naphthalimide)),f eaturing non-and twofold interpenetrating pcu-type bipillared-layer open structures with sufficient free voids of 58.4, 51.4, 51.5, and 41.4 %, respectively,h ave been hydro(solvo)thermally synthesized.M OFs 1-4 emitted solid-state blue or cyan fluorescence emissions at 447 AE 7nm, which mainly arose from NI-bpy-44 and are dependento nt he incorporated solvents. After immersing the crystalline samples in different solvents, that is, H 2 Oa nd DMSO (1 and 2)a sw ell as nitrobenzene and phenol (1-4), they exhibited ar emarkable fluorescenceq uenching effect, whereas o-xylene and pxylene( 4)c aused significant fluorescencee nhancement. The sensing abilityo fM OFs 1-4 towardn itroc ompoundsc arried out in the vapor phase showed that nitrobenzenea nd 2-nitrophenol displayed detectable fluorescence quenching with 1, 2,a nd 4 whereas 4-nitrotoluenew as an effective fluorescenceq uencher for 1 and 2;t his is most likely attributed to their electron-deficient properties and higherv apor pressures.M oreover,MOFs 1-4 are highlyr eusablefor quick capture of volatile iodine, as supported by clear crystal color change and also by immense fluorescenceq uenching responses owing to the donor-acceptor interaction. Low-pressure CO 2 adsorption isothermsi ndicatet hat activated materials 1'-4' are inefficient at taking up CO 2 .[a] T.
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