This work demonstrates that the use of high-negative and high-symmetry lacunary polyoxometalates (POMs) for the clustering of alkali metal ions is afeasible strategy not only for the formation of rare high-nuclearity alkali-metal clusters but also for the construction of new-type all-inorganic ionic porous materials.B yt he strategy,a nu nprecedented highnuclearity K-H 2 Ocluster {K 42 (H 2 O) 60 }with core-shell K 6 @K 36 configuration is stabilized by 8C 3v -symmetry trivacant POMs [GeW 9 O 34 ] 10À ,f orming an ovel giant ionic alkali-metal-POM composite cluster {K 42 Ge 8 W 72 O 272 (H 2 O) 60 }with more than 100 metal centers.T he incorporated 42-nuclearity K-H 2 Oc luster {K 42 (H 2 O) 60 }exhibits the highest-nuclearity alkali-metal-water cluster knownt od ate in POM chemistry.F urther,t he giant {K 42 Ge 8 W 72 O 272 (H 2 O) 60 }clusters can be linked by another kind of alkali metal ions Na + to generate af ascinating threedimensional all-inorganic ionic porous framework with high chemical stability,p roton conductivity,a nd water vapor adsorption.Figure 3. a) PXRD patterns of 1 after being soaked in water for 2hours at pH 2-12. b) Thermodiffractograms of the as-synthesized sample 1. c) Water vapor sorption isotherms (298 K) of 1.d)Nyquist plot for 1 under different RH conditionsw ith T = 30 8 8C. e) Nyquist plot of 1 under different temperatures with 98 %RH. f) Arrhenius plots of the proton conductivity of 1.
Background: Early allograft dysfunction (EAD) is associated with decreased graft and patient survival rates. This study aimed to identify the severity of EAD and develop a predictive model for EAD after donation after circulatory death (DCD) liver transplantation (LT). Furthermore, the influence of operative time on EAD incidence was also evaluated. Methods: In this retrospective, multicentre cohort study, nomograms were established based on a singlecentre training cohort (n=321) and validated in a 3-center validation cohort (n=501). Results: The incidence rate of EAD was 46.4% (149/321) in the training cohort and 40.5% (203/501) in the validation cohort. Of the 149 EAD patients in the training cohort, 77 patients with either elevated alanine aminotransferase (ALT) or aspartate aminotransferase (AST) were classified as having EAD type A, and the rest of the EAD patients were classified as having EAD type B. Recipients with EAD type B had lower graft and patient survival rates than recipients with EAD type A (P=0.043 and 0.044, respectively). We further developed a nomogram to predict EAD (graft weight, cold ischemia time, donor age, model for endstage liver disease (MELD) score) and another nomogram to predict EAD type B (graft weight, cold ischemia time, MELD score). The nomograms for the prediction of EAD and EAD type B had good discrimination [concordance index (C-index) =0.712 (0.666-0.758), 0.707 (0.641-0.773)] and calibration [Hosmer-Lemeshow (HL) P=0.384, P=0.425] in the validation cohort. An increased operative time (>6 h) was associated with increased EAD and EAD type B incidence in the high-risk group (P=0.005, P=0.020, respectively).Conclusions: EAD type B was associated with decreased graft and patient survival rates. The novel nomograms effectively predicted the incidence of EAD and EAD type B in DCD LT patients.
In this work, novel dimeric polyoxotantalate (POTa) clusters {Cu(en)(Ta6O19)}2/{Cu(enMe)(Ta6O19)}2 were introduced as SBUs to construct a new family of extended POTa materials, including the first two 3D POTa frameworks and two 2D POTa layers.
During the past decade, research on the design and synthesis of zeolite-like metal-organic frameworks (ZMOFs) has developed greatly. As an important subclass of ZMOFs, zeolite-like cluster organic frameworks (ZCOFs) built from 4-connected metal-cluster secondary building units (SBUs) and appropriate linear organic ligand bridges have attracted sustained interest, because such materials not only integrate the merits of inorganic zeolites, ZMOFs, and metal clusters, including interesting topologies, high surface areas, extra-large cavities and channels, structural tunability, and unique physicochemical properties from various metal clusters, but also open up a new avenue to design and fabricate hybrid zeolite-like materials that have many potential applications in material sciences. In this review, recent developments in ZCOFs are summarized by classifying the ZCOFs into four categories according to the composition of the SBUs: 1) ZCOFs based on metal-halide cluster SBUs, 2) ZCOFs based on metal-oxygen cluster SBUs, 3) ZCOFs based on metal-chalcogen cluster SBUs, and 4) ZCOFs based on mixed types of metal-cluster SBUs. Besides, challenges associated with the design and synthesis of ZCOFs and the vast potential of this area are also discussed.
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