We report the synthesis of two new cluster anions [Cu4@E18] 4-(E = Sn, Pb), in which a Cu4 subunit is incorporated into a continuous E18 tetrel cage. Both anions are characterized by X-ray crystallography and mass spectrometry, complemented by quantum chemical calculations which highlight the relationships to known Zintl clusters including the stannaspherenes and plumbaspherenes, [M@Sn12] qand [M@Pb12] q-, the Matryoshka bronze [Sn@Cu12@Sn20] 12and also [Pd2@E'18] 4-(E' = Ge, Sn). Figure 5. Comparison of the structures and frontier Kohn-Sham orbitals of D2h-symmetric [Cu2@Sn18] 6and D3d-symmetric [Cu2@Sn18] 2viewed down the conserved C2 axis. The middle of the HOMO-LUMO gap is taken as the zero of energy for all three clusters.ASSOCIATED CONTENT Supporting Information. The detailed experimental procedures, crystallographic supplementation, electrospray ionization mass spectrometry (ESI-MS) analysis, energy dispersive X-ray (EDX) spectroscopic analysis, and quantum chemical studies.
C 24 H 26 Br4Hg 2 N 10 , triclinic, P (no. 2), a = 7.587(1) Å, b = 9.801(1) Å, c = 11.037(2) Å, α = 78.81(1)°, β = 86.41(1)°, γ = 75.97(1)°, V = 781.0
CCDC no.: 1267/4124
Source of materialThe ligand 1-[(2-ethyl-1H-imidazol-1-yl)methyl]-1H-benzotriazole (0.04 mmol, 0.0096 g) in methanol (6 mL) was added dropwise to a methanol solution (6 mL) of HgBr 2 (0.04 mmol, 0.0144 g) in methanol. The resulting solution was allowed to stand at room temperature. After three weeks colourless crystals were obtained.
Experimental detailsH atoms were generated geometrically and re ned as riding atoms with C-H = 0.93 Å and U iso (H) = 1.2 times Ueq(C) for aromatic H atoms, with C-H = 0.97 Å and U iso (H) = 1.2 times, Ueq(C) for methylene H atoms, and with C-H = 0.96 Å and U iso (H) = 1.5 times Ueq(C) for methyl H atoms. The measured crystal was a non-merohedral twin (twin law).
High‐entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near‐equal atomic ratios of multi‐principal elements. Material design and property tailoring possibilities emerge from this new class of materials. Herein, the discovery of superconductivity 2.35 K and topological properties in the (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C high‐entropy carbide ceramic (HECC) is reported, which is not observed before in any of the investigated HECC. Density functional theory calculations show that six type‐II Dirac points exist in (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C, which mainly contributed from the t2g orbitals of transition metals and the p orbitals of C. Due to the stability of the structure, robust superconductivity (SC) under pressure in this HEC superconductor is also observed. This study expands the physical properties of HECs, which may become a new material platform for SC research, especially for studying the coupling between SC and topological physics.
A facile solvothermally assisted g-C3N4 post-grafting technique with aromatic amine dyes via Schiff base chemical reaction was successfully developed in this study. Based on this strategy, three D-π-A type aromatic...
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