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Related Concept Videos

Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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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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Isomerism in Complexes
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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.
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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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Chiral Optoelectronic Functionalities via DNA-Organic Semiconductor Complex.

Moon Jong Han1, Hee Seong Yun2, Yongjoon Cho3,4

  • 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

ACS Nano
|December 7, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a bio-organic field-effect transistor (BOFET) using DNA and perylene diimide (PDI). This novel device exhibits unique chiroptical and electrical properties, paving the way for advanced optoelectronics.

Keywords:
DNAbio-organic field-effect transistorschiral optoelectronicsorganic semiconductorsorientation

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Area of Science:

  • Organic electronics
  • Biomaterials science
  • Chiroptics

Background:

  • DNA's natural chirality and anisotropy can be leveraged in electronic devices.
  • Organic field-effect transistors (OFETs) traditionally lack chiroptical functionalities.
  • Perylene diimide (PDI) is a well-known organic semiconductor with excellent electron transport properties.

Purpose of the Study:

  • To fabricate a novel bio-organic field-effect transistor (BOFET) using a DNA-PDI complex.
  • To investigate the relationship between molecular orientation and charge transport in DNA-PDI films.
  • To explore the chiroptical and electrical functionalities of the developed BOFET.

Main Methods:

  • Fabrication of a bio-organic field-effect transistor (BOFET) using a DNA-perylene diimide (PDI) complex.
  • Preparation of shear-oriented films of the DNA-PDI complex to control molecular orientation.
  • Characterization of the optoelectronic properties, including charge carrier mobility, photoresponsivity, and photosensitivity.

Main Results:

  • The DNA-PDI complex exhibited unusual chiroptical and electrical functionalities.
  • Large-area periodic molecular orientation was achieved, correlating with charge transport and optoelectronic properties.
  • The BOFET demonstrated high charge carrier mobility (3.97 cm² V⁻¹ s⁻¹), photoresponsivity (1.18 A W⁻¹), and photosensitivity (7.76 × 10³).
  • The device showed a definitive response to the handedness of circularly polarized light with a dissymmetry factor of +0.14.

Conclusions:

  • The study successfully integrated DNA's chirality with PDI's conductivity for advanced chiro-optoelectronic functions.
  • The developed BOFET offers significant improvements over traditional OFETs by incorporating chirality.
  • This work highlights the potential of using natural biomaterials like DNA in organic electronics for novel functionalities.