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Related Concept Videos

Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Controlled atomic doping of a single C60 molecule.

R Yamachika1, M Grobis, A Wachowiak

  • 1Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-7300, USA.

Science (New York, N.Y.)
|March 16, 2004
PubMed
Summary

Scientists developed a new method to attach charge dopant atoms to single molecules. This technique precisely tunes molecular electronic structure by controllably adding potassium atoms to C60 molecules.

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Area of Science:

  • Surface Science
  • Molecular Physics
  • Nanotechnology

Background:

  • Precise control over molecular electronic properties is crucial for developing advanced molecular devices.
  • Attaching dopant atoms to individual molecules offers a pathway to tune their electronic structure.
  • Existing methods often lack control over the number and placement of dopant atoms.

Purpose of the Study:

  • To develop a controllable method for attaching arbitrary numbers of charge dopant atoms to a single molecule.
  • To investigate the charge transfer dynamics between dopant atoms and a target molecule.
  • To demonstrate the tunability of molecular electronic structure via controlled doping.

Main Methods:

  • Utilizing a scanning tunneling microscope (STM) tip to manipulate individual potassium (K) atoms.
  • Adsorbing K atoms on a silver (Ag) surface.
  • Reversibly attaching K atoms to a single C60 molecule by controlled STM manipulation.

Main Results:

  • Demonstrated the ability to controllably attach an arbitrary number of K atoms to a single C60 molecule.
  • Spectroscopic measurements confirmed each K atom donates approximately 0.6 electron charge to the C60 molecule.
  • The molecular electronic structure of C60 was precisely and reversibly tuned by the attached K atoms.

Conclusions:

  • A novel method for controlled molecular doping using STM manipulation has been established.
  • This technique allows for precise tuning of molecular electronic properties by controlling the number of dopant atoms.
  • The findings open possibilities for designing bespoke molecular electronic components.