Azulene‐Fused Acenes

Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene‐fused acene molecules (1, 2 and 3), which are isoelectronic to the...

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Published inAngewandte Chemie International Edition Vol. 61; no. 44; pp. e202209286 - n/a
Main Authors Ong, Albert, Tao, Tao, Jiang, Qing, Han, Yi, Ou, Yaping, Huang, Kuo‐Wei, Chi, Chunyan
Format Journal Article
LanguageEnglish
Published WEINHEIM Wiley 02.11.2022
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Abstract Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene‐fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X‐ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six‐ and five‐membered rings while the seven‐membered ring remains non‐aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 32+ exhibited an open‐shell diradical character (y0=30.2 %) as confirmed by variable‐temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6‐anthraquinodimethane unit annulated with two aromatic tropylium rings. Fusion of azulene to acenes of various length led to unexpected properties such as aromaticity and photophysical properties, and they are more stable than the respective isoelectronic acenes. Their dications showed aromaticity shift and one of them exhibited open‐shell diradical character.
AbstractList Non-alternant non-benzenoid pi-conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all-benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene-fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X-ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six- and five-membered rings while the seven-membered ring remains non-aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 3(2+) exhibited an open-shell diradical character (y(0)=30.2 %) as confirmed by variable-temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6-anthraquinodimethane unit annulated with two aromatic tropylium rings.
Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene‐fused acene molecules ( 1 , 2 and 3 ), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X‐ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six‐ and five‐membered rings while the seven‐membered ring remains non‐aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1 , 2 and 3 were formed by chemical oxidation. Notably, 3 2+ exhibited an open‐shell diradical character ( y 0 =30.2 %) as confirmed by variable‐temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6‐anthraquinodimethane unit annulated with two aromatic tropylium rings.
Non-alternant non-benzenoid π-conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all-benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene-fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X-ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six- and five-membered rings while the seven-membered ring remains non-aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 32+ exhibited an open-shell diradical character (y0 =30.2 %) as confirmed by variable-temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6-anthraquinodimethane unit annulated with two aromatic tropylium rings.Non-alternant non-benzenoid π-conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all-benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene-fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X-ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six- and five-membered rings while the seven-membered ring remains non-aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 32+ exhibited an open-shell diradical character (y0 =30.2 %) as confirmed by variable-temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6-anthraquinodimethane unit annulated with two aromatic tropylium rings.
Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene‐fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X‐ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six‐ and five‐membered rings while the seven‐membered ring remains non‐aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 32+ exhibited an open‐shell diradical character (y0=30.2 %) as confirmed by variable‐temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6‐anthraquinodimethane unit annulated with two aromatic tropylium rings. Fusion of azulene to acenes of various length led to unexpected properties such as aromaticity and photophysical properties, and they are more stable than the respective isoelectronic acenes. Their dications showed aromaticity shift and one of them exhibited open‐shell diradical character.
Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs. Herein, we report the synthesis and physical properties of three azulene‐fused acene molecules (1, 2 and 3), which are isoelectronic to the pentacene, hexacene and heptacene, respectively. X‐ray crystallographic analysis, NMR spectra, and theoretical calculations reveal a localised aromatic backbone comprising all the six‐ and five‐membered rings while the seven‐membered ring remains non‐aromatic. They display properties of both azulene and acenes and are much more stable than the respective acenes. The dications of 1, 2 and 3 were formed by chemical oxidation. Notably, 32+ exhibited an open‐shell diradical character (y0=30.2 %) as confirmed by variable‐temperature NMR and ESR measurements, which can be explained by recovery of aromaticity of an 2,6‐anthraquinodimethane unit annulated with two aromatic tropylium rings.
ArticleNumber 202209286
Author Han, Yi
Ou, Yaping
Tao, Tao
Huang, Kuo‐Wei
Jiang, Qing
Ong, Albert
Chi, Chunyan
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  surname: Chi
  fullname: Chi, Chunyan
  email: chmcc@nus.edu.sg
  organization: National University of Singapore
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Issue 44
Keywords DESIGN
Aromaticity
Polycyclic Hydrocarbon
HETEROACENES
Azulene
MOLECULES
CONJUGATED POLYMERS
Acene
BIAZULENE DIIMIDES
PENTACENE
BACKBONE
DERIVATIVES
UNITS
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Snippet Non‐alternant non‐benzenoid π‐conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all‐benzenoid PHs....
Non-alternant non-benzenoid pi-conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all-benzenoid...
Non-alternant non-benzenoid π-conjugated polycyclic hydrocarbons (PHs) are expected to exhibit very different electronic properties from the all-benzenoid PHs....
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StartPage e202209286
SubjectTerms Acene
Aromaticity
Azulene
Chemistry
Chemistry, Multidisciplinary
Crystallography
NMR
Nuclear magnetic resonance
Oxidation
Physical properties
Physical Sciences
Polycyclic Hydrocarbon
Science & Technology
Title Azulene‐Fused Acenes
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fanie.202209286
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