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Galvanic replacement is a versatile approach to prepare hollow nanostructures with controllable morphology and elemental composition for wide applications on catalysts and biomedicines. Towards a full understanding of galvanic replacement, the primary issue is to identify its fundamental mechanism. In this study, in‐situ liquid cell transmission electron microscopy was employed to monitor the dynamic reaction process and to explore the mechanism of galvanic replacement. From which, detailed reaction process was revealed based on in‐situ experiments, in which small Au particles firstly appeared around Ag nanowires; they coalesced, grew and adhered to Ag nanowires. After that, small pits grew from the edge of Ag nanowires till to form tubular.
Bonding scenarios: The synthesis and spectroscopic identification of the trisbenzene complexes of strontium and barium M(Bz)3 (M=Sr, Ba) in low‐temperature Ne matrix is reported. The complexes exhibit metal–ligand bonds that are typical for transition metal compounds. The results suggest that the heavier alkaline earth atoms exhibit the full bonding scenario of transition metals. Abstract. We report the synthesis and spectroscopic identification of the trisbenzene complexes of strontium and barium M(Bz)3 (M=Sr, Ba) in low‐temperature Ne matrix. Both complexes are characterized by a D3 symmetric structure involving three equivalent η6‐bound benzene ligands and a closed‐shell singlet electronic ground state. The analysis of the electronic stru.
Balancing act: A method to achieve oxygen‐balanced energetic materials (EMs) through cocrystallization is developed that avoids the risks inherent in molecular synthesis while achieving intimate association of oxidizing and fuel moieties. This method is applied to ammonium dinitramide yielding an EM with improved physical and energetic properties. Abstract. Achieving energetic materials with a balanced ratio of oxidant to fuel is a challenge that has been difficult to meet through molecular synthesis. The alternative approach, composite formulation, fails to achieve intimate association of the components to the detriment of performance. Herein, the energetic oxidizer ammonium dinitramide (ADN) is combined with fuel‐rich pyrazine‐1,4‐dioxide
The triphenylene and fluoranthene molecules—potential precursors to two‐ and three‐dimensional graphitic nano sheets in the interstellar medium—can be formed through rapid molecular mass growth processes by the reactions of phenyl radical with biphenyl and naphthalene at high temperatures. Abstract. Polycyclic aromatic hydrocarbons (PAHs) represent the link between resonance‐stabilized free radicals and carbonaceous nanoparticles generated in incomplete combustion processes and in circumstellar envelopes of carbon rich asymptotic giant branch (AGB) stars.
We report a switchable synthesis of acylindoles and quinoline derivatives via gold‐catalyzed annulations of anthranils and ynamides. With an N,O‐ligand on a gold(III) catalyst α‐imino gold carbenes, in situ generated from anthranils, could undergo electrophilic attack to the aryl π‐bond followed by unexpected and highly selective 1,4‐ or 1,3‐acyl migrations to form 6‐acylindoles or 5‐acylindoles. With the JohnPhos ligand gold(I) carbenes experienced carbene/carbonyl additions to deliver quinoline oxides. Some of these epoxides represent valuable substrates for the preparation of 3‐hydroxylquinolines, quinolin‐3(4H)‐ones and polycyclic compounds via facile in situ rearrangements. The reaction can be efficiently conducted on gram scale and th.
The structural stability of cathode materials during electrochemical reactions, in particular, under high‐rate discharge, is pertinent to the design and development of new electrode materials that can satisfy the stringent requirements of high energy and power density for electric vehicles.
Speeding up data acquisition: Design of a polymer nanodisc containing a DOTA chelator enables the utilization of the PRE effect in studies using lipid nanodiscs. This new technique can be applied to water‐soluble biomolecules such as G‐quadruplexes. Abstract. Paramagnetic relaxation enhancement (PRE) is commonly used to speed up spin lattice relaxation time (T1) for rapid data acquisition in NMR structural studies. Consequently, there is significant interest in novel paramagnetic labels for enhanced NMR studies on biomolecules. Herein, we report the synthesis and characterization of a modified poly(styrene‐co‐maleic acid) polymer which forms nanodiscs while showing the ability to chelate metal ions. Cu2+‐chelated nanodiscs are demonstrated t.
Making inorganics elastic: Hairy nanocomposites of metal–organic polyhedra are designed and synthesized, and their structures have been fully studied. Their relationship to the unique thermal and mechanical properties of the nanocomposites have been revealed for the first time. The studies finally led to the concept of the first MOP‐based elastomers, which is of immediate and practical motivation of the design of separation membranes. Abstract. Monodispersed hairy nanocomposites with typical 2 nm (isophthalic acid)24Cu24 metal–organic polyhedra (MOP) as a core protected by 24 polymer chains with controlled narrow molecular weight distribution has been probed by imaging and scattering studies for the heterogeneity of polymers in the nanocompo.


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