Abstract
The orientation of the porphyrin ring in nematic liquid-crystalline phases is shown to be controlled by modification of guest-host dynamics through molecular design. Thus, attachment of rod-like mesogenic residues or "arms" to α,α,α,α,-meso-tetrakis(o -aminophenyl)porphyrin yields the porphyrin, MesogenP, having molecular compatibility with standard liquid-crystalline compounds. Both the free-base and zinc porphyrin were photoexcited to the triplet state and detected by time-resolved EPR spectroscopy. The spectra show that the orientation, porphyrin ring parallel to the director, found for the simple tetraphenyl porphyrin, is inverted in the case of the MesogenP so that the porphyrin ring is perpendicular to the director in both frozen and fluid nematic phases.
| Original language | English |
|---|---|
| Pages (from-to) | 249-252 |
| Number of pages | 4 |
| Journal | Chemical Physics Letters |
| Volume | 182 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - Aug 2 1991 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Spectroscopy
- Condensed Matter Physics
- Atomic and Molecular Physics, and Optics
- Surfaces and Interfaces
Cite this
Controlled orientation of porphyrins by molecular design in thermotropic liquid crystals : a time-resolved EPR study. / Neumann, Ronny; Hugerat, Muhamad; Michaeli, Shalom; Natt, Aliza; Bernitz, Mazal; Levanon, Haim.
In: Chemical Physics Letters, Vol. 182, No. 3-4, 02.08.1991, p. 249-252.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlled orientation of porphyrins by molecular design in thermotropic liquid crystals
T2 - a time-resolved EPR study
AU - Neumann, Ronny
AU - Hugerat, Muhamad
AU - Michaeli, Shalom
AU - Natt, Aliza
AU - Bernitz, Mazal
AU - Levanon, Haim
PY - 1991/8/2
Y1 - 1991/8/2
N2 - The orientation of the porphyrin ring in nematic liquid-crystalline phases is shown to be controlled by modification of guest-host dynamics through molecular design. Thus, attachment of rod-like mesogenic residues or "arms" to α,α,α,α,-meso-tetrakis(o -aminophenyl)porphyrin yields the porphyrin, MesogenP, having molecular compatibility with standard liquid-crystalline compounds. Both the free-base and zinc porphyrin were photoexcited to the triplet state and detected by time-resolved EPR spectroscopy. The spectra show that the orientation, porphyrin ring parallel to the director, found for the simple tetraphenyl porphyrin, is inverted in the case of the MesogenP so that the porphyrin ring is perpendicular to the director in both frozen and fluid nematic phases.
AB - The orientation of the porphyrin ring in nematic liquid-crystalline phases is shown to be controlled by modification of guest-host dynamics through molecular design. Thus, attachment of rod-like mesogenic residues or "arms" to α,α,α,α,-meso-tetrakis(o -aminophenyl)porphyrin yields the porphyrin, MesogenP, having molecular compatibility with standard liquid-crystalline compounds. Both the free-base and zinc porphyrin were photoexcited to the triplet state and detected by time-resolved EPR spectroscopy. The spectra show that the orientation, porphyrin ring parallel to the director, found for the simple tetraphenyl porphyrin, is inverted in the case of the MesogenP so that the porphyrin ring is perpendicular to the director in both frozen and fluid nematic phases.
UR - http://www.scopus.com/inward/record.url?scp=26544465814&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=26544465814&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(91)80209-G
DO - 10.1016/0009-2614(91)80209-G
M3 - Article
VL - 182
SP - 249
EP - 252
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 3-4
ER -