Zirconium-based metal-organic frameworks (Zr-MOFs) are a subclass of MOFs {known|recognized|identified} for their {remarkable|outstanding|exceptional} stability, {especially|particularly|specifically|specially|in particular} {in the|within the|inside the} presence of water. This {makes|tends to make} them {extremely|very|incredibly|really|particularly|exceptionally} {attractive|appealing|desirable|eye-catching} for {practical|sensible} applications, {including|such as|which includes|like} CO2 capture from industrial emission sources; {however|nevertheless|nonetheless|even so|on the other hand|having said that}, the CO2 adsorption capacity of Zr-MOFs is moderate {compared to|in comparison to|in comparison with|when compared with} that {of the|from the|in the|on the|with the|of your} {best|very best|greatest|ideal|finest|most effective} performing MOFs reported to date. Functionalization of Zr-MOFs with amino groups has been demonstrated to {increase|improve|boost|enhance|raise} their affinity for CO2. {In this|Within this} {work|function|perform|operate}, we assessed the {potential|possible|prospective} of post-synthetic defect exchange (PSDE) as an {alternative|option} {approach|method|strategy} to introduce amino functionalities at missing-cluster defective {sites|websites|web sites|internet sites|web-sites|web pages} in formic acid modulated UiO-66. {Both|Each} pyridine-containing (picolinic acid and nicotinic acid) and aniline-containing (3-aminobenzoic acid and anthranilic acid) monocarboxylates {were|had been|have been} integrated {within|inside} defective UiO-66 with this {method|technique|approach|strategy|system|process}. Non-defective UiO-66 modified with linkers bearing {the same|exactly the same|the identical|precisely the same|the exact same} amino groups ({2|two},5-pyridinedicarboxylic acid and 2-aminoterephthalic acid) {were|had been|have been} {prepared|ready} by classical post-synthetic ligand exchange (PSE), {in order to|to be able to|as a way to|in an effort to|so as to|so that you can} {compare|evaluate|examine} the {effect|impact} of introducing functionalities at defective {sites|websites|web sites|internet sites|web-sites|web pages} versus installing them {on the|around the} backbone. PSDE reduces the porosity of defective UiO-66, but improves {both|each} the CO2 uptake {and the|and also the|as well as the|along with the|plus the} CO2/N2 selectivity, whereas PSE has no {effect|impact} {on the|around the} porosity of non-defective UiO-66, {improving|enhancing} the CO2 uptake but leaving selectivity unchanged. Modification of defective UiO-66 with benzoic acid reveals that pore size reduction {is the|will be the|may be the|would be the|could be the|is definitely the} {main|primary|principal|major|key|most important} {factor|aspect|element|issue} {responsible|accountable} for the observed uptake improvement, whereas the presence of nitrogen atoms {in the|within the|inside the} pores {seems|appears} {to be|to become} {beneficial|advantageous|helpful|useful|valuable|effective} for {increasing|growing|escalating|rising} selectivity. 2′-Deoxy-2′-fluoroadenosine site 1-Bromo-3,4-difluoro-2-methoxybenzene custom synthesis PMID:23724934
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