Nonlinear Variation in the Composition and Optical Band Gap of an Alloyed Cluster-Based Open-Framework Metal Chalcogenide

Unexpected nonlinear variation in the composition and optical band gap was observed in an alloyed open-framework metal chalcogenide composed of supertetrahedral clusters. A tentative hypothesis was proposed to explain how the title compound [In₂₈Se₅₄(H₂O)₄]·24H⁺-PR·<i>n</i>H₂O (PR = piperidine) exhibits a limitation in the S-alloying level and a large variation in the optical band gap

Supertetrahedral Cluster-Based In–Se Open Frameworks with Unique Polyselenide Ion as Linker

Reported here are three new In–Se open frameworks with unique polyselenide ion as linker. Single-crystal X-ray diffraction analyses demonstrate that supertetrahedral T<i>n</i> (<i>n</i> = 2, 3) clusters serving as secondary building units in these compounds are connected via polyselenide ligands to form the interrupted or elongated diamond topologies. UV–vis absorption analysis and photoelectric response measurements indicate that these In–Se frameworks retain semiconductor properties, making them potential candidates in photocatalytic applications

Two Unique Crystalline Semiconductor Zeolite Analogues Based on Indium Selenide Clusters

Developing the structural diversity of microporous zeolitic frameworks with integrated semiconducting properties is promising but remains a challenge. Reported here are two unique crystalline semiconductor zeolite analogues constructed from two kinds of indium selenide clusters with augmented ctn and zeolite-type sod networks. The intrinsic semiconducting nature in these In–Se domains gives rise to pore-size-dependent and visible-light-driven photocatalytic activity for organic dye degradation

An Unusual Metal Chalcogenide Zeolitic Framework Built from the Extended Spiro‑5 Units with Supertetrahedral Clusters as Nodes

Reported here is a new metal chalcogenide semiconductor with the double-interpenetrated zeolitic nabesite framework, which is constructed by the rare extended spiro-5 units with supertetrahedral clusters serving as building units. Different from the TO₄-based simple spiro-5 unit frequently observed in oxide-based zeolites, the extended spiro-5 unit composed of five supertetrahedral T3-InSnS clusters is for the first time observed in the family of open-framework metal chalcogenides. Such secondary building units finally assemble into a rare NAB topological framework with large external space. In addition, the title semiconductor material also displays good properties in photocurrent response and electrocatalytic oxygen reduction reaction

The First Observation on Dual Self-Closed and Extended Assembly Modes in Supertetrahedral T3 Cluster Based Open-Framework Chalcogenide

Reported here is a new open-framework metal chalcogenide semiconductor with omy topology built from typical supertetrahedral T3-InSnS cluster via dual self-closed and extended assembly modes. This represents the second case containing dual assembly modes in cluster based open-framework superlattices. Interestingly, the self-closed assembly of T3 clusters results in an unprecedented supersupertetrahedral T3,2 cluster, being a new member filling in the blank in the family of supersupertetrahedral clusters. In addition, the title compound also shows good photocatalytic activity for the degradation of methylene blue

Median baseline characteristics of participants according to non-HDL-C quintiles.

<p>Non-HDL-C: non-high-density lipoprotein cholesterol; HDL-C: high-density lipoprotein cholesterol</p

Normal and typical TCD waveform indicative of ICAS in the middle cerebral artery.

<p>Normal and typical TCD waveform indicative of ICAS in the middle cerebral artery.</p

Multivariate-adjusted odd ratios^* (OR) for ICAS according to non-HDL-C levels, stratified by gender and selected risk factors.

*<p>Multivariate-adjusted odd ratios (OR): adjusted for age, gender, BMI, hypertension, diabetes, smoking, HDL-C, triglycerides</p

Cation-Exchanged Zeolitic Chalcogenides for CO₂ Adsorption

We report here the intrinsic advantages of a special family of porous chalcogenides for CO₂ adsorption in terms of high selectivity of CO₂/N₂, large uptake capacity, and robust structure due to their first-ever unique integration of the chalcogen-soft surface, high porosity, all-inorganic crystalline framework, and the tunable charge-to-volume ratio of exchangeable cations. Although tuning the CO₂ adsorption properties via the type of exchangeable cations has been well-studied in oxides and MOFs, little is known about the effects of inorganic exchangeable cations in porous chalcogenides, in part because ion exchange in chalcogenides can be very sluggish and incomplete due to their soft character. We have demonstrated that, through a methodological change to progressively tune the host–guest interactions, both facile and nearly complete ion exchange can be accomplished. Herein, a series of cation-exchanged zeolitic chalcogenides (denoted as M@RWY) were studied for the first time for CO₂ adsorption. Samples were prepared through a sequential ion-exchange strategy, and Cs⁺-, Rb⁺-, and K⁺-exchanged samples demonstrated excellent CO₂ adsorption performance. Particularly, K@RWY has the superior CO₂/N₂ selectivity with the N₂ adsorption even undetected at either 298 or 273 K. It also has the large uptake of 6.3 mmol/g (141 cm³/g) at 273 K and 1 atm with an isosteric heat of 35–41 kJ mol^–1, the best among known porous chalcogenides. Moreover, it permits a facile regeneration and exhibits an excellent recyclability, as shown by the multicycling adsorption experiments. Notably, K@RWY also demonstrates a strong tolerance toward water

Odd ratios (OR) for ICAS according to baseline blood lipid levels quintiles.

<p>95% CI, 95% confidence interval; non-HDL-C, non-high-density lipoprotein cholesterol; LDL-C, low-density lipoprotein cholesterol.</p>*<p>Model 1: adjusted for age, and gender. ^†Model2: adjusted for age, gender, BMI, hypertension, diabetes, smoking, HDL-C and triglycerides.</p