Control of porphyrin orientation in thermotropic liquid crystals by molecular design. A time-resolved EPR study

Shalom Michaeli, Muhamad Hugerat, Haim Levanon, Mazal Bernitz, Aliza Natt, Ronny Neumann

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Molecular compatibility of a guest porphyrin in a thermotropic nematic liquid crystalline host phase was shown to control the orientation of the porphyrin chromophore. In this manner, the normal alignment of a porphyrin plane parallel to the director in a nematic phase was inverted to a perpendicular orientation by attachment of mesogenic type appendages orthogonal to a porphyrin ring on one side of the ring plane. This molecular design also leads to a head-to-tail ordering of the porphyrin even in isotropic phases. The conclusions reached are based on detection and analysis of time-resolved EPR spectra of photoexcited triplet states.

Original languageEnglish
Pages (from-to)3612-3618
Number of pages7
JournalJournal of the American Chemical Society
Volume114
Issue number10
Publication statusPublished - May 6 1992

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Thermotropic liquid crystals
Liquid Crystals
Porphyrins
Paramagnetic resonance
Chromophores
Crystal orientation
Crystalline materials
Liquids

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Control of porphyrin orientation in thermotropic liquid crystals by molecular design. A time-resolved EPR study. / Michaeli, Shalom; Hugerat, Muhamad; Levanon, Haim; Bernitz, Mazal; Natt, Aliza; Neumann, Ronny.

In: Journal of the American Chemical Society, Vol. 114, No. 10, 06.05.1992, p. 3612-3618.

Research output: Contribution to journalArticle

Michaeli, Shalom ; Hugerat, Muhamad ; Levanon, Haim ; Bernitz, Mazal ; Natt, Aliza ; Neumann, Ronny. / Control of porphyrin orientation in thermotropic liquid crystals by molecular design. A time-resolved EPR study. In: Journal of the American Chemical Society. 1992 ; Vol. 114, No. 10. pp. 3612-3618.
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