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When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...
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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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Multiple local σ-aromaticity of nonagermanide clusters.

Nikolay V Tkachenko1, Alexander I Boldyrev1

  • 1Department of Chemistry and Biochemistry , Utah State University , 0300 Old Main Hill , Logan , UT 84322-0300 , USA .

Chemical Science
|July 12, 2019
PubMed
Summary

We uncovered a clear bonding pattern in nonagermanide clusters, explaining their diverse structures and reactivity. This research clarifies the chemical bonding in these important inorganic synthesis compounds.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Nonagermanide clusters are crucial in inorganic synthesis but their chemical bonding remains incompletely understood.
  • Understanding the bonding in these clusters is key to predicting and controlling their reactivity and structural diversity.

Purpose of the Study:

  • To decipher the chemical bonding patterns within various experimentally relevant nonagermanide species.
  • To provide a chemically intuitive explanation for the observed geometries and active sites in these clusters.

Main Methods:

  • Utilized the Atoms in Molecules (AIM) based on the non-covalent interactions (NCI) index and the adaptive Natural Density Topological Analysis (AdNDP) algorithm.
  • Applied these methods to model structures of nonagermanide clusters, including [Ge9]4-, [Ge9{P(NH2)2}3]-, Cu[Ge9{P(NH2)2}3], and Cu(NHC)[Ge9{P(NH2)2}3].
  • Localized electron density to reveal bonding characteristics.

Main Results:

  • Established a simple and chemically intuitive bonding pattern for nonagermanide clusters.
  • Explained the prevalence of both D3h and C4v geometries and the variety of active sites observed in these clusters.
  • Identified the [Ge9]4- core as a unique inorganic Zintl cluster exhibiting multiple local sigma-aromaticity.

Conclusions:

  • The deciphered bonding pattern provides a fundamental understanding of nonagermanide cluster chemistry.
  • This work clarifies the factors governing the structural diversity and reactivity of these important inorganic compounds.
  • The identification of multiple local sigma-aromaticity in the [Ge9]4- core opens new avenues for exploring electronic properties in Zintl clusters.