Highly emissive tribenzotriquinacene-based double-rimed nanocube

The study of discrete nanosized cages has gone a long way to seek aesthetically appealing structures and to carry out functional applications.Although the construction of supramolecular cages via a bottom-up self-assembly process has been well developed,the sophisticated synthesis still remains a challenge.Here we report the design and assembly of a giant double-rimed nanocube Zn_(24)LH_(8),built with 8 tribenzotriquinacene as six-connected vertices and 24<tpy-Zn^(2+)-tpy>(tpy=terpyridine)connectivities serving as the edges.From the single-crystal structure of tribenzotriquinacene-based ligand LH,the bowl-shaped ligand defines a suitable rigid platform for the spatially well-defined attachment of three sets of parallel vertices,which promotes the quantitative formation of the desired three-dimensional(3D)double-rimed cubic architectures.The formed nanocube Zn_(24)LH_(8)possesses molecular weight up to 25.6 kDa and side length 5.3 nm.Remarkably,the Zn_(24)LH_(8)exhibits strong cyan light emission with high luminescence quantum yields in solution and in the solid state based on the inherent cage-confinement induced emission enhancement.By adding orange-emissive Rhodamine B,emission tuning experiments were achieved including white light emission.This work presents a new system for the imitation of complex assemblies and provides a promising candidate for emissive materials.

Trefoil-shaped metallacycle and metallacage via heteroleptic self-assembly

Template-oriented multi-component synthesis method has been proven to be an exceedingly reasonable and excellent method for the synthesis of giant two-dimensional(2D)and three-dimensional(3D)supramolecules,but designing and constructing heteroleptic and controllable self-assembly without unexpected by-products remains a challenge.Here we report two discrete trefoil-shaped metallacycle S1 and metallacage s2 by heteroleptic self-assembly using one hexaphenylbenzene core ligand and two capping ligands.The 2D trefoil-shaped metallacycle S1 could resemble the emblem of the classic'Mitsubishi motif.The use of template-oriented ligand and bent spacer ligand promotes the quantitative formation of the desired 3D trefoil-shaped metallacage S2.The formed metallacage S2 possesses a molecular weight up to 36 kDa,diameter 6.6 nm and height 3.0 nm.All supramolecular coordination complexes were fully characterized by NMR spectroscopy(^(1)H NMR,2D COSY,2D NOESY,2D DOSY),high-resolution electrospray ionization mass sectrometry ESI-MS.ESI-TWIM-MS,TEM and AFM.

Excellent mechanical properties and large magnetocaloric effect of spark plasma sintered Ni-Mn-In-Co alloy

The Ni43.75Mn37.5In12.5Co6.25 alloy was obtained by using the spark plasma sintering(SPS)technique.The martensitic transformation,magnetic and mechanical properties of the SPS alloy were investigated.Key findings demonstrate that the martensitic transformation temperature of this alloy is about 10 K lower than that of the as-cast one.Both SPS and as-cast alloys show a 7 layered modulated martensite(7M)at room temperature.The compressive fracture strength and strain of the SPS alloy increase by 176.92%and 33.33%compared with the as-cast alloy,achieving 1440 MPa and 14%,respectively.The maximum magnetic entropy change Smis 17.1 J kg^(-1)K^(-1)for the SPS alloy at the magnetic field of 5 T.

First-principles investigation of B2 partial disordered structure,martensitic transformation, elastic and magnetic properties of all-d-metal Ni-Mn-Ti Heusler alloys

In this work,the B2 partial disordered structure of the austenitic parent phase,martensitic transformation,elastic and magnetic properties of the Ni8 Mn4+xTi4-x(x=0,1 and 2) Heusler alloys have been systematically investigated by the first-principles calculations.The preferential atomic occupation of B2 structure is one Ti atom exchange with the nearest neighboring Mn atom from the view of lowest energy principle.This disordered exchange sites(Mn-Ti) and the excess Mn atoms occupying the Ti sites(MnTi)could reduce the nearest Mn-Mn distance,resulting in the anti ferromagnetic state in the austenitic and martensitic phases of the alloys.The total magnetic moment of the alloy decreases with the increasing Mn content;it is ascribed to the antiferromagnetic magnetic moments of the excess Mn atoms.When x=0,the alloy does not undergo martensitic transformation since the austenite has absolute phase stability.The martensitic transformation will occur during cooling process for x=1 or 2,owing to the energy difference between the austenite and the martensite could provide the driving force for the phase transformation.The elastic properties of the cubic austenitic phase for the Ni2 MnTi alloy is calculated,and the results reveal the reason why Ni-Mn-Ti alloy has excellent mechanical properties.The origin of martensitic transformation and magnetic properties was discussed based on the electronic density of states.

Regulation of Social Memory by Lateral Entorhinal Cortical Projection to Dorsal Hippocampal CA2

Dear Editor,TSocial recognition memory is essential for proper conspecific interactions and its impairments are closely associated with many brain disorders,including autism,schizophrenia,and Alzheimer's disease[1-3].However,the mechanisms and neural circuits underlying social memory formation and retrieval are still unclear.Recent studies have revealed that several brain regions are involved in social memory formation,and the hippocampal dorsal CA2(dCA2)subregion appears to be its core locus[4,5].