Total Structure, Structural Transformation and Catalytic Hydrogenation of [Cu (SC H F ) Cl (P(PhF) ) (H) ] Constructed from Twisted Cu Units.

Herein, a remarkable achievement in the synthesis and characterization of an atomically precise copper-hydride nanocluster, [Cu (SC H F ) Cl (P(PhF) ) (H) ] via a mild one-pot reaction is presented. Through X-ray crystallography analysis, it is revealed that [Cu (SC H F ) Cl (P(PhF) ) (H) ] exhibits a unique shell-core-shell structure. The inner Cu kernel is composed of three twisted Cu units, connected through Cu face sharing.

Size Growth of AuCu: From Increased Nucleation to Surface Capping.

The size conversion of atomically precise metal nanoclusters is fundamental for elucidating structure-property correlations. In this study, copper salt (CuCl)-induced size growth from [AuCu(Dppm)(SAdm)] (abbreviated as ) to [AuCu(Dppm)(SAdm)Cl] (abbreviated as ) (SAdmH = 1-adamantane mercaptan, Dppm = bis-(diphenylphosphino)methane) was investigated via experiments and density functional theory calculations. The adopts a defective pentagonal bipyramid core structure with surface cavities, which could be easily filled with the sterically less hindered CuCl and CuSCy (i.

Structured copper-hydride nanoclusters provide insight into the surface-vacancy-defect to non-defect structural evolution.

Exploring the structural evolution of clusters with similar sizes and atom numbers induced by the removal or addition of a few atoms contributes to a deep understanding of structure-property relationships. Herein, three well-characterized copper-hydride nanoclusters that provide insight into the surface-vacancy-defect to non-defect structural evolution were reported. A surface-defective copper hydride nanocluster [Cu(S--CH)(PPhPy)H] (Cu-PPhPy for short) with only one symmetry axis was synthesized using a one-pot method under mild conditions, and its structure was determined.

Horizontal expansion of biicosahedral M-based nanoclusters: resolving decades-long questions.

For metal nanoclusters with the "cluster of clusters" intramolecular evolution pattern, most efforts have been made towards the vertical superposition of icosahedral nanobuilding blocks (, from mono-icosahedral Au to bi-icosahedral Au and tri-icosahedral Au), while the horizontal expansion of these rod-shaped multi-icosahedral aggregates was largely neglected. We herein report the horizontal expansion of the biicosahedral M cluster framework, yielding an [AuAg(S-Adm)(DPPM)Cl] nanocluster that contains an AuAg kernel and six Au(DPPM)(S-Adm) peripheral wings. The structural determination of [AuAg(S-Adm)(DPPM)Cl] resolved a decades-long question towards rod-shaped multi-icosahedral aggregates: how to load bidentate phosphine and bulky thiol ligands onto the nanocluster framework? The structural comparison between [AuAg(S-Adm)(DPPM)Cl] and previously reported [AuAg(PPh)Cl] or [AuAg(SR)(PPh)Cl] rationalized the unique packing of Au(DPPM)(S-Adm) motif structures on the surface of the former nanocluster.

Experimental Realization of a Quantum Refrigerator Driven by Indefinite Causal Orders.

Indefinite causal order (ICO) is playing a key role in recent quantum technologies. Here, we experimentally study quantum thermodynamics driven by ICO on nuclear spins using the nuclear magnetic resonance system. We realize the ICO of two thermalizing channels to exhibit how the mechanism works, and show that the working substance can be cooled or heated albeit it undergoes thermal contacts with reservoirs of the same temperature.

Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect.

In open quantum systems, the precision of metrology inevitably suffers from the noise. In Markovian open quantum dynamics, the precision can not be improved by using entangled probes although the measurement time is effectively shortened. However, it was predicted over one decade ago that in a non-Markovian one, the error can be significantly reduced by the quantum Zeno effect (QZE) [Chin, Huelga, and Plenio, Phys.

Development of sodium alginate-based antioxidant and antibacterial bioactive films added with IRMOF-3/Carvacrol.

The purpose of this study was to compare the effects of different concentrations of the amine-functionalized isoreticular metal-organic framework-3 loaded with carvacrol (IRMOF-3/CA) on the properties of sodium alginate (SA) composite films, thus determining the optimal addition amount and further preparing bioactive packaging film with antibacterial and antioxidant activities. The morphology, structure, physical properties, antioxidant and antibacterial activities of the films were characterized and analyzed. The results showed that the thermal stability and light barrier property of the films were improved by the addition of IRMOF-3/CA.

Palladium-catalyzed aerobic oxyarylthiolation of alkynone -methyloximes with arylhydrazines and elemental sulfur.

A novel and practical palladium-catalyzed aerobic oxyarylthiolation of alkynone O-methyloximes for the assembly of 4-sulfenylisoxazole derivatives using S8 and arylhydrazines as the S-aryl sources is accomplished. In the presence of 0.1 mol% of IPr-Pd-allyl-Cl as the catalyst and O2 (1 atm) as the sole oxidant, both alkynone O-methyloximes and arylhydrazines are suitable substrates, delivering diverse 4-sulfenyl isoxazoles in moderate to good yields with good functional group tolerance.

Palladium-catalyzed three-component cascade arylthiolation with aryldiazonium salts as S-arylation sources.

A novel and efficient palladium-catalyzed three-component cascade cyclization/arylthiolation has been developed for the assembly of diverse 3-sulfenylindole and 3-sulfenylbenzofuran derivatives from 2-alkynylamines and 2-alkynylphenols, aryldiazonium salts, and Na2S2O3 under aerobic conditions with PEG-200 as an environmentally benign medium. The current study features exceptional functional group tolerance without additional ligands, oxidants or silver salts, and eco-friendly mild reaction conditions. The ionic liquid [C2OHmim]Cl plays a crucial role in this protocol as an environmentally friendly additive.

[Research on algorithms of uterine contraction curve analysis and its real-time status identification].

Identification of real-time uterine contraction status is very significant to labor analgesia, but the traditional uterine contraction analysis algorithms and systems cannot meet the requirement. According to the situations mentioned above, this paper designs a set of algorithms for the real-time analysis of uterine contraction status. The algorithms include uterine contraction signal preprocessing, uterine contraction baseline extraction based on histogram and linear iteration and an algorithm for the real-time analysis of uterine contraction status based on finite state machines theory.