Highly efficient green InP-based quantum dot light-emitting diodes regulated by inner alloyed shell component.

InP-based quantum dot light-emitting diodes (QLEDs), as less toxic than Cd-free and Pb-free optoelectronic devices, have become the most promising benign alternatives for the next generation lighting and display. However, the development of green-emitting InP-based QLEDs still remains a great challenge to the environmental preparation of InP quantum dots (QDs) and superior device performance. Herein, we reported the highly efficient green-emitting InP-based QLEDs regulated by the inner alloyed shell components.

Synthesis of a Dimeric Base-Stabilized Cobaltosilylene Complex for Catalytic C-H Bond Functionalization and C-C Bond Formation.

The synthesis of a dimeric base-stabilized cobaltosilylene complex and its catalytic reactions are described. Treatment of the amidinato silicon(I) dimer [LSi:] (1; L=PhC(NtBu) ) with CoBr in toluene for 10 days afforded the dimeric amidinato cobaltosilylene [(LSi)μ-{CoBr(LSiBr)}] (2), which is speculated to proceed via "LSiCoBr" and "LSiBr" intermediates in the reaction. Compound 2 is paramagnetic, with an effective magnetic moment of 2.

B-H Bond Activation by an Amidinate-Stabilized Amidosilylene: Non-Innocent Amidinate Ligand.

The activation of B-H and B-Cl bonds in boranes by base-stabilized low-valent silicon compounds is described. The reaction of the amidinato amidosilylene-borane adduct [L{Ar(MeSi)N}SiBH] [1; L = PhC(N tBu), and Ar = 2,6- iPrCH] with MeOTf in toluene at room temperature formed [L{Ar(MeSi)N}SiBHOTf] (2). [LSiN(SiMe)Ar] in compound 2 then underwent a B-H bond activation with BHOTf in refluxing toluene to afford the B-H bond activation product [LB(H)Si(H)(OTf){N(SiMe)Ar}] (3).

Reactivity of an amidinato silylene and germylene toward germanium(ii), tin(ii) and lead(ii) halides.

The coordination chemistry of an amidinato silylene and germylene toward group 14 element(ii) halides is described. The reaction of the amidinato silicon(ii) amide [LSiN(SiMe)] (1, L = PhC(NtBu)) with SnCl and PbBr afforded the amidinato silylene-dichlorostannylene and -dibromoplumbylene adducts [L{(MeSi)N}SiEX] (E = Sn, X = Cl (2); E = Pb, X = Br (3)), respectively, in which there is a lone pair of electrons on the Sn(ii) and Pb(ii) atoms. X-ray crystallography, NMR spectroscopy and theoretical studies show conclusively that the Si(ii)-E(ii) bonds are donor-acceptor interactions.

Donor-Acceptor Stabilized Tetra(silanimine).

The synthesis of an oligo(silanimine) is described. The reaction of the amidinato silylene [LSiN(SiMe)] (1, L = PhC(NtBu)) with SiI in toluene afforded a mixture of the silanimine [LSi(I)NSiI] (2), SiMeI, and SiI. The mechanistic studies showed that 1 reacts with SiI to form the silyl ionic intermediate "{LSi(I)N(SiMe)}{SiI}", which then eliminates SiMeI and "SiI" to form the silanimine intermediate "LSi(I)NSiMe".

An N-heterocyclic silylene-stabilized digermanium(0) complex.

The synthesis of an N-heterocyclic silylene-stabilized digermanium(0) complex is described. The reaction of the amidinate-stabilized silicon(II) amide [LSiN(SiMe3)2] (1; L=PhC(NtBu)2) with GeCl2⋅dioxane in toluene afforded the Si(II)-Ge(II) adduct [L{(Me3Si)2N}Si→GeCl2] (2). Reaction of the adduct with two equivalents of KC8 in toluene at room temperature afforded the N-heterocyclic carbene silylene-stabilized digermanium(0) complex [L{(Me3Si)2N}Si→Ge=Ge←Si{N(SiMe3)2}L] (3).

Preparation of mesoporous silica nanoflakes and nanospheres with perpendicular pore channels.

Silica nanoflakes and nanospheres with perpendicular pore channels are attractive due to their potential applications. Herein, the nanoflakes were prepared using the self-assemblies of a chiral low-molecular-weight amphiphile, L-18Ala4PyBr, as the templates; and nanospheres were prepared using this amphiphile and cyclohexane as a co-structure-directing agent. By gradually increasing the bridging alkylene chain length of L-18Ala4PyBr, amphiphiles L-18Ala6PyBr and L-18Ala11PyBr were synthesized.

From nanotubes to nano-cocoons with coiled pore channels.

Silica nanotubes with coiled pore channels and hollow spheres with coiled or concentric circular pore channels have been prepared using the self-assemblies of chiral cationic amphiphiles as templates. However, the relationship among these morphologies and pore architectures has not been well studied. For a better understanding the relationship, silica nanostructures were systematically prepared by tuning the reaction conditions.