136591-53-2Relevant academic research and scientific papers
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
, p. 3612 - 3618 (1992)
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.
