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Chemistry

Title:		"Fluorescent Cadmium Bipillared-Layer Open Frameworks: Synthesis, Structures, Sensing of Nitro Compounds, and Capture of Volatile Iodine"
Author(s):		Chen TC; Tsai MJ; Wu JY;
Address:		"Department of Applied Chemistry, National Chi Nan University, Nantou, 545, Taiwan"
Journal Title:		Chemistry
Year:		2019
Volume:		20181220
Issue:		5
Page Number:		1337 - 1344
DOI:		10.1002/chem.201804673
ISSN/ISBN:		1521-3765 (Electronic) 0947-6539 (Linking)
Abstract:		"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)), featuring 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, have been hydro(solvo)thermally synthesized. MOFs 1-4 emitted solid-state blue or cyan fluorescence emissions at 447+/-7 nm, which mainly arose from NI-bpy-44 and are dependent on the incorporated solvents. After immersing the crystalline samples in different solvents, that is, H(2) O and DMSO (1 and 2) as well as nitrobenzene and phenol (1-4), they exhibited a remarkable fluorescence quenching effect, whereas o-xylene and p-xylene (4) caused significant fluorescence enhancement. The sensing ability of MOFs 1-4 toward nitro compounds carried out in the vapor phase showed that nitrobenzene and 2-nitrophenol displayed detectable fluorescence quenching with 1, 2, and 4 whereas 4-nitrotoluene was an effective fluorescence quencher for 1 and 2; this is most likely attributed to their electron-deficient properties and higher vapor pressures. Moreover, MOFs 1-4 are highly reusable for quick capture of volatile iodine, as supported by clear crystal color change and also by immense fluorescence quenching responses owing to the donor-acceptor interaction. Low-pressure CO(2) adsorption isotherms indicate that activated materials 1'-4' are inefficient at taking up CO(2)"
Keywords:		cadmium fluorescence iodine metal-organic frameworks nitro compounds;
Notes:		"PubMed-not-MEDLINEChen, Tang-Ching Tsai, Meng-Jung Wu, Jing-Yun eng MOST 104-2113-M-260-005-/Ministry of Science and Technology, Taiwan/ MOST 105-2119-M-260-004-/Ministry of Science and Technology, Taiwan/ MOST 106-2113-M-260-007-/Ministry of Science and Technology, Taiwan/ National Chi Nan University/ Germany 2018/11/06 Chemistry. 2019 Jan 24; 25(5):1337-1344. doi: 10.1002/chem.201804673. Epub 2018 Dec 20"