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Hydroboration-Oxidation of Alkenes03:08

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Monolayer Borophene Formation on Cu(111) Surface Triggered by Step Edge.

Hao Li1, Jiangang Yang1, Yaping Ma1,2,3

  • 1School of Physical Science and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
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Researchers elucidated borophene growth on copper (Cu) surfaces. They observed amorphous boron transforming into striped-phase and then β-type borophene, clarifying its formation mechanism on Cu(111).

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charge transfergradual annealingmonolayer borophenestep edgesstriped-phase borophene

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Area of Science:

  • Materials Science
  • Surface Science
  • Condensed Matter Physics

Background:

  • Borophene, a 2D material, shows promise for electronics, energy storage, and sensors.
  • Monolayer borophene has been grown on Ag(111) and Au(111) via surface adsorption and boron segregation.
  • The growth mechanism of borophene on Cu(111) remained unclear.

Purpose of the Study:

  • To investigate the growth mode and phase transformation of borophene on Cu(111).
  • To understand the formation of β-type borophene on copper surfaces.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) for in-situ observation.
  • Performed theoretical calculations to support experimental findings.
  • Analyzed boron nanostructure evolution under varying substrate temperatures.

Main Results:

  • Observed amorphous boron transforming into striped-phase borophene (η = 1/6) at Cu step edges.
  • Identified the formation of irregularly shaped β-type borophene (η = 5/36) on the Cu surface or embedded in the Cu layer.
  • Striped-phase borophene was identified as a metastable phase requiring further buckling and electron transfer for stabilization.

Conclusions:

  • Provided a comprehensive understanding of β-type borophene formation on Cu(111).
  • The findings suggest potential pathways for synthesizing borophene on less reactive substrates with 1D defects.