Multiple fluorescence response behaviors towards antibiotics and bacteria based on a highly stable Cd-MOF

Multiple fluorescence response behaviours to proteins/bacteria and selective antibacterial activity of cetylpyridinium chloride (CPC)-based cationic carbon dots

“…This was due to inner filter effect (IFE). 16,34 The UV-vis spectra showed CDs has absorption peak at 344 and 400 nm that overlap with the emission spectrum of the BSA (Fig. S1, panel C, see ESI†).…”

Porous MB@Cd-MOF Obtained by Post-Modification: Self-Calibrated Fluorescent Turn-on Sensor for Highly Sensitive Detection of Carbaryl

“…Meanwhile, the deprotonated carboxyl groups as hard base can adopt a variety of coordination modes with metal ions, which is beneficial to the preparation of MOFs with structural diversity and good crystallinity. 24 As for central metal ions, Zn 2+ /Cd 2+ ions with d 10 unsaturated sites, and excellent fluorescence characteristics. 25 However, LMOF-based sensors are based on single emission fluorescence recognition, which have the drawbacks of low sensitivity and inaccuracy.…”

“…According to the Hard and Soft Acids and Bases (HSAB) theory, N donor groups as soft base are easy to coordinate with soft acid (Pb 2+ , Hg 2+ , and Cd 2+ ), which is conducive to the synthesis of stable MOFs. Meanwhile, the deprotonated carboxyl groups as hard base can adopt a variety of coordination modes with metal ions, which is beneficial to the preparation of MOFs with structural diversity and good crystallinity . As for central metal ions, Zn 2+ /Cd 2+ ions with d 10 configuration are chosen due to their unique electronic configuration, multiple unsaturated sites, and excellent fluorescence characteristics .…”

Development of Cationic Benzimidazole-Containing UiO-66 through Step-by-Step Linker Modification to Enhance the Initial Sorption Rate and Sorption Capacities for Heavy Metal Oxo-Anions

“…Metal–organic frameworks (MOFs) as a new class of porous adsorbent materials have received deserved attention. In general, MOFs possess inherent properties of desirable adsorbents, such as high surface areas, controllable porosity, defined chemical functionalities, and tunable pore structures. − Meanwhile, a few types of MOFs, especially UiO-66s, as adsorbent materials also exhibit the following uniqueness: (i) They are stable in aqueous solution (especially under acidic or alkaline conditions) and exhibit exceptional chemical stability. (ii) They have high porosity, which can provide channels to facilitate the target adsorbate access and transfer process.…”

“…To date, to the best of our knowledge, the use of cationic MOFs as adsorbents is still rare because several great challenges exist: (1) the direct synthesis of cationic frameworks is still often accidental; (2) most MOFs are usually unstable in aqueous solutions; and (3) some cationic MOFs suffer from low mass transfer rates and adsorption amounts. ,, Benzimidazole groups are effective functionalized substituents with highly conjugated π systems that have excellent coordination abilities, are easily converted to imidazolium ions by methyl modification, and can form hydrogen bonds. ,, We expected to first decorate the benzene-1,4-dicarboxylate ligands of UiO-66 with benzimidazole functional groups, which can act as adsorption sites to enhance the binding affinity for targeted ions by anion−π interactions, hydrogen bonding, and van der Waals forces, resulting in a boost of UiO-66’s adsorption performance. More importantly, the process of further introducing methyl moieties to form positively charged benzimidazolium groups was expected to yield an imidazolium-decorated cationic MOF, Bim-UiO-66-Me, that can be employed as a synergistic adsorbent containing ion-exchange and binding affinity interactions between the MOF material and target metal oxo-anions.…”