Abstract
At room temperature, meso-hexaaryl-substituted [28]hexaphyrins(1.1.1.1.1.1) in solution exist largely as an equilibrium between planar antiaromatic and distorted Mobius aromatic conformers. As the temperature decreases, the molecular structure changes into the distorted Mobius topology that commonly occurs in [28]hexaphyrins, which gives rise to longer excited singlet and triplet state lifetimes than planar antiaromatic [28]hexaphyrins. Temperature-dependent two-photon absorption measurements of [28]hexaphyrin indicate that the degree of aromaticity of Mobius [28]hexaphyrin is large, comparable to that of Huckel aromatic planar [26]hexaphyrin. Through our spectroscopic investigations, we have demonstrated that a subtle balance between the strains induced by the size of the [28]hexaphyrin macrocyclic ring and the energy stabilization contributed by electron delocalization in the formation of distorted Mobius [28]hexaphyrin leads to the molecular structure change into the Mobius topology as the temperature decreases.
| Original language | English |
|---|---|
| Pages (from-to) | 4498-4506 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry A |
| Volume | 113 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 2009 Apr 23 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
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Temperature-dependent conformational change of weso- Hexakis(pentafluorophenyl) [28]Hexaphyrins(1.1.1.1.1.1) into mobius structures. / Kim, Suk; Yoon, Seok; Ricks, Butler; Shin, Yoon; Mori, Shigeki; Sankar, Jeyaraman; Saito, Shohei; Jung, Young Mee; Wasielewski, Michael R.; Osuka, Atsuhiro; Kim, Dongho.
In: Journal of Physical Chemistry A, Vol. 113, No. 16, 23.04.2009, p. 4498-4506.Research output: Contribution to journal › Article
TY - JOUR
T1 - Temperature-dependent conformational change of weso- Hexakis(pentafluorophenyl) [28]Hexaphyrins(1.1.1.1.1.1) into mobius structures
AU - Kim, Suk
AU - Yoon, Seok
AU - Ricks, Butler
AU - Shin, Yoon
AU - Mori, Shigeki
AU - Sankar, Jeyaraman
AU - Saito, Shohei
AU - Jung, Young Mee
AU - Wasielewski, Michael R.
AU - Osuka, Atsuhiro
AU - Kim, Dongho
PY - 2009/4/23
Y1 - 2009/4/23
N2 - At room temperature, meso-hexaaryl-substituted [28]hexaphyrins(1.1.1.1.1.1) in solution exist largely as an equilibrium between planar antiaromatic and distorted Mobius aromatic conformers. As the temperature decreases, the molecular structure changes into the distorted Mobius topology that commonly occurs in [28]hexaphyrins, which gives rise to longer excited singlet and triplet state lifetimes than planar antiaromatic [28]hexaphyrins. Temperature-dependent two-photon absorption measurements of [28]hexaphyrin indicate that the degree of aromaticity of Mobius [28]hexaphyrin is large, comparable to that of Huckel aromatic planar [26]hexaphyrin. Through our spectroscopic investigations, we have demonstrated that a subtle balance between the strains induced by the size of the [28]hexaphyrin macrocyclic ring and the energy stabilization contributed by electron delocalization in the formation of distorted Mobius [28]hexaphyrin leads to the molecular structure change into the Mobius topology as the temperature decreases.
AB - At room temperature, meso-hexaaryl-substituted [28]hexaphyrins(1.1.1.1.1.1) in solution exist largely as an equilibrium between planar antiaromatic and distorted Mobius aromatic conformers. As the temperature decreases, the molecular structure changes into the distorted Mobius topology that commonly occurs in [28]hexaphyrins, which gives rise to longer excited singlet and triplet state lifetimes than planar antiaromatic [28]hexaphyrins. Temperature-dependent two-photon absorption measurements of [28]hexaphyrin indicate that the degree of aromaticity of Mobius [28]hexaphyrin is large, comparable to that of Huckel aromatic planar [26]hexaphyrin. Through our spectroscopic investigations, we have demonstrated that a subtle balance between the strains induced by the size of the [28]hexaphyrin macrocyclic ring and the energy stabilization contributed by electron delocalization in the formation of distorted Mobius [28]hexaphyrin leads to the molecular structure change into the Mobius topology as the temperature decreases.
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U2 - 10.1021/jp8111205
DO - 10.1021/jp8111205
M3 - Article
C2 - 19265390
AN - SCOPUS:65649134713
VL - 113
SP - 4498
EP - 4506
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 16
ER -