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Related Concept Videos

Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

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Published on: December 4, 2014

Surface chirality of CuO thin films.

Roland Widmer1, Franz-Josef Haug, Pascal Ruffieux

  • 1Empa, Swiss Federal Laboratories for Materials Testing and Research, nanotech@surfaces Laboratory, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland. roland.widmer@empa.ch

Journal of the American Chemical Society
|October 26, 2006
PubMed
Summary

Chiral tartaric acid (TA) enables electrochemical deposition of homochiral copper oxide (CuO) thin films. X-ray photoelectron diffraction (XPD) confirmed surface chirality and orientation control, demonstrating enantioselective film growth.

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Area of Science:

  • Materials Science
  • Surface Science
  • Electrochemistry

Background:

  • Copper oxide (CuO) thin films are crucial in various applications.
  • Controlling surface chirality is essential for advanced material properties.
  • Electrochemical deposition offers a versatile route for thin film fabrication.

Purpose of the Study:

  • To investigate the influence of chiral tartaric acid on CuO thin film growth.
  • To determine the surface structure and chirality of electrodeposited CuO films.
  • To explore enantioselective deposition of chiral CuO surfaces.

Main Methods:

  • Electrochemical deposition of CuO thin films on Au(001).
  • X-ray photoelectron spectroscopy (XPS) for elemental analysis.
  • X-ray photoelectron diffraction (XPD) for surface structure and chirality determination.
  • Single scattering cluster (SSC) calculations for data analysis.

Main Results:

  • Enantiopure tartaric acid (TA) resulted in homochiral CuO surfaces, confirmed by XPD.
  • Racemic or meso-TA led to symmetric XPD patterns, indicating achiral surfaces.
  • Films grown with l(+)-TA showed CuO(1) orientation; d(-)-TA resulted in CuO(11) orientation.
  • Alternating enantiomers of TA produced CuO films with alternating chirality.
  • Pre-deposited chiral CuO surfaces exhibited enantioselectivity in subsequent deposition steps.

Conclusions:

  • Chiral tartaric acid acts as a structure-directing agent in electrochemical CuO deposition.
  • Electrochemical methods can achieve controlled chirality and orientation in CuO thin films.
  • The study demonstrates a pathway for creating enantioselective surfaces for advanced applications.