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Can Variations of 1 H NMR Chemical Shifts in Benzene Substituted with an Electron-Accepting (NO2 )/Donating (NH2 ) Group be Explained in Terms of Resonance Effects of Substituents?

Overview of attention for article published in Chemistry - An Asian Journal, March 2018
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  • In the top 25% of all research outputs scored by Altmetric
  • Good Attention Score compared to outputs of the same age (75th percentile)
  • High Attention Score compared to outputs of the same age and source (90th percentile)

Mentioned by

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1 news outlet
facebook
1 Facebook page

Citations

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1 Dimensions

Readers on

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9 Mendeley
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Title
Can Variations of 1 H NMR Chemical Shifts in Benzene Substituted with an Electron-Accepting (NO2 )/Donating (NH2 ) Group be Explained in Terms of Resonance Effects of Substituents?
Published in
Chemistry - An Asian Journal, March 2018
DOI 10.1002/asia.201800137
Pubmed ID
Authors

Marija Baranac-Stojanović

Abstract

The classical textbook explanation of variations of 1 H NMR chemical shifts in benzenes bearing an electron-donating (NH2 ) or an electron-withdrawing (NO2 ) group in terms of substituent resonance effects was examined by analyzing molecular orbital contributions to the total shielding. It was found that the π-electronic system showed a more pronounced shielding effect on all ring hydrogen atoms, relative to benzene, irrespective of substituent +R/-R effects. For the latter, this was in contrast to the traditional explanations of downfield shift of nitrobenzene proton resonances, which were found to be determined by the σ-electronic system and oxygen in-plane lone pairs. In aniline, the +R effect of NH2 group can be used to fully explain the upfield position of meta-H signals and partly the upfield position of para-H signals, the latter also being influenced by the σ-system. The position of the lowest frequency signal of ortho-Hs was fully determined by σ-electrons.

Mendeley readers

The data shown below were compiled from readership statistics for 9 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 9 100%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 3 33%
Student > Master 2 22%
Other 1 11%
Student > Ph. D. Student 1 11%
Unknown 2 22%
Readers by discipline Count As %
Chemistry 4 44%
Biochemistry, Genetics and Molecular Biology 1 11%
Medicine and Dentistry 1 11%
Unknown 3 33%

Attention Score in Context

This research output has an Altmetric Attention Score of 8. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 15 March 2018.
All research outputs
#1,945,630
of 12,651,470 outputs
Outputs from Chemistry - An Asian Journal
#217
of 3,516 outputs
Outputs of similar age
#65,413
of 273,220 outputs
Outputs of similar age from Chemistry - An Asian Journal
#12
of 127 outputs
Altmetric has tracked 12,651,470 research outputs across all sources so far. Compared to these this one has done well and is in the 84th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 3,516 research outputs from this source. They receive a mean Attention Score of 1.6. This one has done particularly well, scoring higher than 93% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 273,220 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 75% of its contemporaries.
We're also able to compare this research output to 127 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 90% of its contemporaries.