Three Highly Stable Cobalt MOFs Based on “Y”-Shaped Carboxylic Acid: Synthesis and Absorption of Anionic Dyes

Abstract

Three Co(II) metal-organic frameworks (MOFs) were synthesized employing a rational design approach. On the basis of the different structures of three complexes, we tested their absorption properties toward two anionic dyes. The absorption results indicate that not only uncoordinated functional groups in the structure play an important role in adsorbing capacity but also physical forces can affect absorbing ability. Water stability testing shows that three crystals display high stability in aqueous solutions with different pH values. To our delight, the framework integrity of three complexes can be well-retained even after absorbing dyes.

Two Temperature‐Controlled Zinc Coordination Polymers: Ionothermal Synthesis, Properties, and Dye Adsorption

“…These coulombic forces formed between similar charges of dyes and CPs can improve the adsorption of dyes by CPs, as reported previously in the literature. [2a], , For example, the reported Co–MOFs show different adsorptions of Congo Red and MO due to a similar mechanism. [2a] No coulombic interactions are formed between the neutral dyes (MR and NBC) and the negative skeletons of 1 and 2 , which is the reason for the negligible adsorption.…”

“…[2a], , For example, the reported Co–MOFs show different adsorptions of Congo Red and MO due to a similar mechanism. [2a] No coulombic interactions are formed between the neutral dyes (MR and NBC) and the negative skeletons of 1 and 2 , which is the reason for the negligible adsorption. However, the reason why the sulfonic groups in MO, PS, OIV, and AMOR do not form hydrogen bonds or coulombic interactions with 1 is not clear, but it may be related, among other reasons, to the orientation of the sulfonic groups, the size of the dye, or light degradation.…”

“…Dyes are indispensable industrial products that are widely used in many fields and have toxic, mutagenic, and carcinogenic characteristics . Huge amounts of dye‐containing wastewater generated in industrial processes are discharged into the natural environment causing severe environmental pollution and adverse health effects . Many of the dyes have very different chemical compositions and toxicities and are also very stable, thereby making very difficult their chemical or biological degradation prior to the discharge of wastewater.…”

The Importance of CH···X (X = O, π) Interaction of a New Mixed Ligand Cu(II) Coordination Polymer: Structure, Hirshfeld Surface and Theoretical Studies

“…Weak noncovalent interactions were analyzed and characterized using Bader's theory of "atoms-in-molecules" (AIM). Finally, the solid-state supramolecular assembly was characterized by the "Noncovalent Interaction" (NCI) plot index.Crystals 2018, 8, 455 2 of 15 attraction, hydrogen bonding, interactions involving π-ring [21][22][23][24]. In this respect, C-H···π [25][26][27], π-stacking [28-31], anion···π [32][33][34][35] and lone pair···π [36,37] interactions have been successfully used in building supramolecular networks [38].…”

Syntheses, structural diversity, magnetic properties and dye absorption of various Co(ii) MOFs based on a semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid

“…29 The different colors of complexes 1-5 are caused by the absorption band and absorption intensity.…”