Coordination of Carbon Dioxide to the Lewis Acid Site of a Zinc‐Substituted Polyoxometalate and Formation of an Adduct Using a Polyoxometalate–2,4,6‐Trimethylpyridine Frustrated Lewis Pair

Post transition metal substituted Keggin-type POMs as thin film chemiresistive sensors for H2O and CO2 detection

Chemiresitive sensing allows the affordable and facile detection of small molecules such as H2O and CO2. Herein, we report a novel class of Earth-abundant post transition metal substituted Keggin polyoxometalates (POMs) for chemiresistive sensing applications, with conductivities up to 0.01 S cm-1 under 100% CO2 and 65% Relative Humidity (RH).

Selective electrochemical CO2 conversion with a hybrid polyoxometalate

A multi-component coordination compound, in which ruthenium antenna complexes are connected to a polyoxotungstate core is presented. This hybrid cluster effectively promotes the electrochemical conversion of CO2 to C1 feedstocks, the selectivity of which can be controlled by the acidity of the media.

Recent Advances in the Chemistry of Metal Carbamates

Following a related review dating back to 2003, the present review discusses in detail the various synthetic, structural and reactivity aspects of metal species containing one or more carbamato ligands, representing a large family of compounds across all the periodic table. A preliminary overview is provided on the reactivity of carbon dioxide with amines, and emphasis is given to recent findings concerning applications in various fields.

Unravelling lewis acidic and reductive characters of normal and inverse nickel-cobalt thiospinels in directing catalytic H2O2 cleavage

(Inverse) spinel-typed bimetallic sulfides are fascinating H₂O₂ scissors because of the inclusion of S^2-, which can regenerate metals (M^δ+, δ ≤ 2) used to produce ^•OH via H₂O₂ dissection. These sulfides, however, were under-explored regarding compositional, structural, and electronic tunabilities based on the proper selection of metal constituents. Motivated by S-modified Ni^δ+/Co^δ+ promising to H₂O₂ cleavage, Ni₂CoS₄, NiCo₂S₄, NiS/CoS were synthesized and contrasted with regards to their catalytic traits. Ni₂CoS₄ provided the greatest activity in dissecting H₂O₂ among the catalysts. Nonetheless, Ni₂CoS₄ catalyzed H₂O₂ scission primarily via homogeneous catalysis mediated by leached Ni^δ+/Co^δ+. Conversely, NiCo₂S₄, NiS, and CoS catalyzed H₂O₂ cleavage mainly via unleached Ni^δ+/Co^δ+-enabled heterogeneous catalysis. Of significance, NiCo₂S₄ provided Lewis acidic strength favorable to adsorb H₂O₂ and desorb ^•OH compared to NiS and CoS, respectively. Of additional significance, NiCo₂S₄ provided S^2- with lesser energy required to reduce M^(δ+1)+ via e- transfer than NiS/CoS. Hence, NiCo₂S₄ prompted H₂O₂ scission cycle per unit time better than NiS/CoS, as evidenced by kinetic assessments. NiCo₂S₄ was also superior to Ni₂CoS₄ because of the elongated lifespan anticipated as ^•OH producer, resulting from heterogeneous catalysis with moderate Ni^δ+/Co^δ+ leaching. Furthermore, NiCo₂S₄ revealed the greatest recyclability and mineralization efficiency in decomposing recalcitrants via ^•OH-mediated oxidation.

Polyoxometalate-Based Catalysts for CO2 Conversion

Polyoxometalates (POMs) are a diverse class of anionic metal-oxo clusters with intriguing chemical and physical properties. Owing to unrivaled versatility and structural variation, POMs have been extensively utilized for catalysis for a plethora of reactions. In this focused review, the applications of POMs as promising catalysts or co-catalysts for CO₂ conversion, including CO₂ photo/electro reduction and CO₂ as a carbonyl source for the carbonylation process are summarized. A brief perspective on the potentiality in this field is proposed.