The mechanism of [3+2] annulations between indole-2-formaldehydes and isatins mediated by N-hetrocyclic carbenes: a DFT study

Li, Yan; Zhang, Mingchao; Geng, Lina; Zhang, Zhiqiang

doi:10.1039/d2nj04442k

Cited by 1 publication

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“…Pure graphene films can be obtained at Cu-Zn alloys within 10 min, which has been proved in another work. [55] Under low Zn content, the dissolved W atoms were relatively deficient, forming a carbon rich environment. Thus, monolayer graphene film was easily formed as similar as grown on pure Cu substrate.…”

Section: Resultsmentioning

confidence: 99%

“…[54] Another work demonstrated an efficient strategy for tuning the nucleation density of graphene by varying the composition of liquid Cu-Zn alloys. [55] These pioneering works showcased tunability of alloy substrate catalytic performance through compositional variation, providing invaluable insights for the targeted-selective growth of TMCs and their heterostructure.…”

Section: Introductionmentioning

confidence: 99%

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Substrate Engineering toward Selective Growth of Ultrathin WC Crystals and Heterostructures via Liquid Cu‐Zn Catalyst

Li,

Zhang,

et al. 2024

Adv Funct Materials

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Transition metal carbides (TMCs) grown by chemical vapor deposition (CVD) offer promise for numerous novel phenomena and applications in the 2D limit. Despite considerable efforts thus far, the flexible customization of TMCs and their heterostructures still remains challenging. Herein, a substrate engineering is developed to achieve customized manufacturing of ultrathin WC single crystals and WC/graphene (WC‐G) heterostructures by varying the concentration of Zn in Cu‐Zn alloy substrate. It is worth noting that Zn atoms can remarkably reduce the nucleation density of graphene and promote the nucleation of WC. Thus, an increasing Zn content is applied to synergistically modulate the growth of graphene and WC, enabling the controllable fabrication of WC and WC‐G heterostructures. The synthesized WC crystals exhibit an ultrathin nature down to 3 nm, as well as high crystalline, ultra‐clean surface, and superb chemical stability. Based on that, the typical metallic properties with a temperature‐dependent resistance (nearly 1.30 Ω at 300 K and nearly 0.08 Ω at 1.7 K) and low resistance as well as excellent nonlinear optical performance of WC are demonstrated. This work provides fresh insights into regulating the growth behavior of multiblock‐structured carbides and promotes the study of their optic and electronic properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Substrate Engineering toward Selective Growth of Ultrathin WC Crystals and Heterostructures via Liquid Cu‐Zn Catalyst

Li,

Zhang,

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

The mechanism of [3+2] annulations between indole-2-formaldehydes and isatins mediated by N-hetrocyclic carbenes: a DFT study

Abstract: We present a comprehensive DFT study of the mechanism for N-heterocyclic carbene (NHC)-catalyzed cycloaddition that uses indole-2-formaldehyde and isatin as substrates. After precatalyst activation, the catalytic reaction proceeds through six...

Cited by 1 publication

References 91 publications

Substrate Engineering toward Selective Growth of Ultrathin WC Crystals and Heterostructures via Liquid Cu‐Zn Catalyst

Substrate Engineering toward Selective Growth of Ultrathin WC Crystals and Heterostructures via Liquid Cu‐Zn Catalyst

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