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 language | English |
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Pages (from-to) | 3612-3618 |
Number of pages | 7 |
Journal | Journal of the American Chemical Society |
Volume | 114 |
Issue number | 10 |
DOIs | |
State | Published - 1 May 1992 |