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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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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.
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Sr-centered monocyclic carbon ring Sr@C14: A new stable cluster.

Qi Liang Lu1, Shuang Long Jiang1, Qi Quan Luo2

  • 1School of Physics and Optoelectronic Engineering, Anhui University, Hefei, 230601, Anhui, PR China.

Journal of Molecular Graphics & Modelling
|February 14, 2024
PubMed
Summary
This summary is machine-generated.

Stable alkaline metal-doped cyclo[14]carbon complexes, specifically Sr@C14, show promise for single-molecule devices. These aromatic structures exhibit significant stabilization and stability at moderate temperatures.

Keywords:
Aromaticity and thermodynamic stabilityDensity functional calculationsGlobal searchSr-centered carbon ring

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Endohedral metallofullerenes and metal-doped carbon rings are crucial for developing novel molecular devices.
  • Understanding the structural, electronic, and stability properties of these complexes is essential for their practical application.

Purpose of the Study:

  • To investigate the structural, electronic, and stability properties of alkaline metal-doped cyclo[14]carbon complexes.
  • To determine the global minima and bonding characteristics of strontium-doped C14 (Sr@C14).
  • To assess the aromaticity and dynamic stability of the Sr@C14 system.

Main Methods:

  • Extensive structural search and density functional theory (DFT) calculations.
  • Molecular orbital, nucleus-independent chemical shift (NICS), and ring current analyses.
  • Ab initio molecular dynamics simulations at various temperatures.

Main Results:

  • Identified perfect planar Sr@C14 as the global minimum with strontium at the center.
  • Observed significant stabilization due to electrostatic interactions between Sr2+ and C14(2-).
  • Confirmed the aromatic nature of Sr@C14, with NICS values exceeding those of benzene.
  • Demonstrated stability of Sr@C14 at low to moderate temperatures.

Conclusions:

  • The study enriches the understanding of chemical structures and bonding in metal-doped cyclo[n]carbons.
  • Sr@C14 exhibits unique properties, including significant aromaticity and stability.
  • Provides foundational knowledge for the experimental synthesis of novel Sr@C14 structures.