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Accomplishing optical activity in

The intermolecular metallophilic interaction has been exploited to orderly aggregate nanocluster compounds into multidimensional assemblies, while the intramolecular metallophilic interaction was rarely reported. Herein, based on an Au

The horizontal expansion of biicosahedral M25 has been accomplished, yielding an [Au19Ag12(S-Adm)6(DPPM)6Cl7]2+ nanocluster that loads bidentate phosphine and bulky thiol ligands.

Although several approaches have been exploited to trigger the structural transformation of metal nanoclusters, most cases are assigned to the unidirectional conversion, while the reversible conversion of nanoclusters remains challenging. In this work, the reversible conversion between two Au–Ag alloy nanoclusters, Au14Ag8(Dppm)6(CN)4Cl4 and Au14Ag4(Dppm)6Cl4, has been accomplished, which was tracked by UV-vis and ESI-MS spectroscopy. The condition of the nanocluster reversible conversion has been meticulously mapped out. Our results provide some new insights into the cluster transformation, which will benefit the future preparation of metalloid clusters with customized structures and properties.

In this work, a new Cu(I) cluster is synthesized and structurally characterized: [Cu11(TBBT)9(PPh3)6](SbF6)2 (where TBBT = 4-tert-butylbenzenethiol). This Cu(I) cluster exhibits good stability and a bright-red emission both in solution (685 nm) and in the solid state (675 nm) with a large Stokes shift (∼280 nm) under ambient conditions. Its absolute quantum yield is 0.22 in the solid state. Temperature-dependent emissions and theoretical calculations suggest that the origin of this cluster luminescence mainly results from a mixture of the metal-ligand charge transfer and the cluster-centered triplet excited states. This work not only opens new opportunities for functional applications of copper clusters but also sheds light on the structure-luminescence relationship.

Alloying is one of the most effective strategies to change the properties of inorganic–organic hybrid materials, but there are few reports of the alloying of one-dimensional nanowires with precise atomic structure due to the difficulties in obtaining the single crystals of nanowires themselves. Herein, we describe the synthesis and characterization of an alloyed one-dimensional Ag–Cu nanowire [Ag2.5Cu1.5(S-Adm)4]n. Compared with the unalloyed [Ag4(S-Adm)4]n, our novel alloyed nanowire exhibits good conductivity, and its resistivity (as a powder) was determined to be 107 Ω m by impedance analysis–consistent with that of a semiconductor. Accordingly, based on these properties combined with its excellent thermal stability and high-yielding, gram-scale synthesis, [Ag2.5Cu1.5(S-Adm)4]n is proposed for electronic-device applications.

The structure/composition of nanoclusters has a decisive influence on their physicochemical properties. In this work, we obtained two different Au-Ag nanoclusters, [Au

Comparable systems are of great significance for understanding the structure-property relationship. Herein, a new Au13Cu2 nanocluster protected by phenylethanethiol (PET) and triphenylphosphine (TPP) is synthesized and structurally determined, including an icosahedral Au13 and two CuS3 configurations. Based on previous work, a comparable system was formed-only the surface coordination of Cu atoms changes from Cu-N to Cu-S, which results in a tremendous change in the optical properties. Based on this, the effect of the coordination mode on the structure and optical properties was primarily investigated in both experiment and theory. And the results demonstrate that changing the coordination mode from Cu-N to Cu-S has a significant effect on the electronic structure. This work will offer new insights into ligand engineering.

Herein, the ligands’ effect in Cu(I) clusters was initially explored. The results demonstrate that the Se atom possesses more coordination modes with Cu (μ2, μ3, μ4, μ6) than S, which significantly modulates the atom-packing mode of Cu(I) clusters. Importantly, this also endows these clusters with different temperature-dependent luminescent behaviours.

The structure/composition of nanoclusters has a decisive influence on their physicochemical properties. In this work, we obtained two different Au–Ag nanoclusters, [Au9Ag12(SAdm)4(dppm)6Cl6]3+ and Au11Ag6(dppm)4(SAdm)4(CN)4, via controlling the Au/Ag molar ratios by a one-pot synthetic approach. The structure of nanoclusters was confirmed and testified by single-crystal x-ray diffraction, electrospray ionization time-of-flight mass spectrometry, XPS, powder x-ray diffraction, and electron paramagnetic resonance. The Au11Ag6 nanocluster possessed a M13 core caped by four Au atoms and four dppm and four AdmS ligands. Interestingly, four CN are observed to locate at the equator of the M13 core. Both nanoclusters contain a similar icosahedral M13 core, whereas their surface structures are totally different. However, the Au11Ag6 nanocluster exhibits good stability and strong red photoluminescence in solution.

Two kinds of diols (MI and MII) and a triol (MIII) with tris(trimethylsiloxy)silyl propyl as the side chains were designed and synthesized. Then three series of silicone modified polyurethanes (SPUI-III) prepolymers were prepared from MI-III, polyether triol (N307) and dicyclohexylmethylmethane-4, 4′-diisocyanate (HMDI). Their structures were confirmed by 1H NMR, 13C NMR and FTIR analysis. Then SPUI-III films were obtained by the moisture curing of the polyurethanes prepolymers, and their properties were investigated by Attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), water surface contact angle (WCA), water and ethanol absorption ratio, stress-strain, abrasion resistance and X-ray diffraction (XRD) analysis. It has been demonstrated that easier surface migration of side-chain silicone segments means only 10 wt% of MI-III can improve the surface hydrophobicity and smoothness, water resistance and abrasion resistance of SPU significantly. Meanwhile, the balance between the polar groups in the backbones and the nonpolar silicone oligomers in the side chains of MI-III is a key to control solubility, compatibility, migration and phase separation with polyurethane system. And difference in structures and dosages of MI-III can influence the abrasion resistance properties, microphase separation, thermal and tensile properties of the prepared SPU materials. Low loadings (10 wt%) of MI-III make remarkable abrasion resistance and excessive loadings make subdued abrasion resistance. Interestingly, the special microphase separation patterns could be obtained in SPUIII series with a proper MIII loading (10–20 wt %).