A multi-responsive luminescent Co(ii) coordination polymer assembled from amide-functionalized organic units for effective pH and cation sensing

Abstract

By employing an amide-containing multicarboxylate ligand of N,N’’-(3,5-dicarboxylphenyl)benzene-1,4-dicarboxamide (H4L), a 3D (3,4,4,6)-connected Co(II) coordination polymer, namely, [Co(L)0.5(tytb)]n (LCU-112, LCU = Liaocheng University, tytb = 1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-Trimethylbenzene) has been constructed through solvothermal...

pH-Stable Zn(II) Coordination Polymer as a Multiresponsive Turn-On and Turn-Off Fluorescent Sensor for Aqueous Medium Detection of Al(III) and Cr(VI) Oxo-Anions

“…No 2, 8, 9, 10, Table S5, Supporting Information) exhibited slightly higher and/or comparable LOD values than IITKGP-70; however, the K value was lower in every case than the developed framework IITKGP-70, which make them inefficient in terms of practical utility. 50,51,58,59 This analysis made IITKGP-70 a promising luminescent material over others for Al 3+ ion sensing in an aqueous medium. Needless to say, CP/MOFbased luminescent sensors exhibiting the Al 3+ turn-on phenomenon are still limited in the literature, whereas the number is significantly less when considering aqueous medium sensing for such (only 10 reports so far).…”

“…In this context, coordination polymers (CPs) and/or metal–organic frameworks (MOFs) are attracting immense interest due to their intriguing properties, such as an accessible high surface area, ordered crystalline structure, permanent porosity, functional tunability, structural diversity, unique flexibility, and variable morphologies. − In particular, owing to the presence of well-organized chromophores (Lewis acid and basic sites) in their chemically tailorable framework, CPs/MOFs exhibit excellent luminescent properties. ,, Such superior properties make them fascinating as an effective sensing probe for the detection of variable analytes including toxic metal ions, hazardous anions, explosives, antibiotics, pesticides, and small organic molecules. ,,− Moreover, the specific host–guest interactions between the incoming analytes and the accessible functional groups of the framework bring more advantages in terms of easy operability, fast responsivity, high selectivity, good sensitivity, and multiple recyclabilities . − Taking advantage of such superiorities, although a large number of CPs/MOFs have been explored for the rapid detection of toxic metal cations and noxious oxo-anions individually or combinedly having turn-off luminescence only, ,,,, multiresponsive behavior with one turn-off and another turn-on luminescent detection by a single CP/MOF platform remains unexplored so far. Compared to single-analyte recognition, frameworks showing simultaneous and rapid sensing for multiple analytes are highly desirable and on-demand as they can increase the versatility and multipurpose usage possibility of the developed sensory materials. ,− On the other hand, although a decent number of coordination frameworks have displayed excellent luminescent performance with high sensitivity and selectivity, their insufficient hydrolytic stability, as well as chemical instability, , forced them to detect targeted analytes in a nonaqueous medium. , However, to make the developed framework affordable and easy to handle, it is desirable to develop robust sensor materials that ca...…”

Two Chemorobust Cobalt(II) Organic Frameworks as High Sensitivity and Selectivity Sensors for Efficient Detection of 3-Nitrotyrosine Biomarker in Serum

“…Considering that 3-NT contains a nitro group, we subsequently analyzed the sensing mechanism from the perspective of photoinduced electron transfer (PET) by calculating the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of 3-NT and H 2 DBrTPA (Figure 9). 67,68 Under the excitation of light, electrons jumped from the HOMO level of H 2 DBrTPA to its LUMO level and then transferred to the LUMO level of 3-NT instead of returning to its HOMO level, for the LUMO level as well as the LUMO−HOMO gap (ΔE) of 3-NT are both lower than those of H 2 DBrTPA. In addition, spectral overlaps also play important roles in revealing the luminescence quenching mechanism.…”

Cd-MOF and Its Ln3+-Post Modification Products: Regulation of Luminescence Properties and Improved Detection of Uric Acid, Quinine, and Quinidine

“…39−45 One recent work has carried out research to improve the sensing performance of Co-MOF (LCU-112) and proved that it can detect and distinguish Al 3+ and Pb 2+ in the presence of Tb 3+ more effectively. 44 Furthermore, visualization of quenching effect toward Fe 3+ could also be improved by replacing LCU-112 with Tb 3+ postsynthesized sample Tb 3+ @LCU-112. In another work, by simply mixing Eu 3+ the detection ability of one 3D Cd-MOF (LCU-117) toward tetracycline could be largely improved with limit of detection as low as 0.118 μM.…”