Hydro(solvo)thermal reactions of Cd(NO), -(pyridin-3-ylmethyl)-4-(pyridin-4-yl)-1,8-naphthalimide (NI-mbpy-34), and 5-bromobenzene-1,3-dicarboxylic acid (Br-1,3-Hbdc) afforded a luminescent coordination polymer, {[Cd(Br-1,3-bdc)(NI-mbpy-34)(HO)]∙2HO} (). Single-crystal X-ray diffraction analysis showed that features a two-dimensional (2-D) gridlike layer with the point symbol of (4·6), where the Cd(II) center adopts a {CdON} pentagonal bipyramidal geometry. Thermogravimetric (TG) analysis confirmed the thermal stability of up to about 340 °C, whereas XRPD patterns proved the maintenance of crystallinity and framework integrity of in CHCl, HO, CHOH, and toluene. Photoluminescence studies indicated that displayed intense blue fluorescence emissions in both solid-state and HO suspension-phase. Owing to the good fluorescent properties, could serve as an excellent turn-off fluorescence sensor for selective and sensitive Cr(VI) detection in water, with LOD = 15.15 μM for CrO and 14.91 μM for CrO, through energy competition absorption mechanism. In addition, could also sensitively detect Cr, Fe, and Al ions in aqueous medium via fluorescence-enhancement responses, with LOD = 2.81 μM for Cr, 3.82 μM for Fe, and 3.37 μM for Al, mainly through an absorbance-caused enhancement (ACE) mechanism.
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| http://dx.doi.org/10.3390/molecules26237103 | DOI Listing |
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