Polarized Fluorescence of N-Salicylideneaniline Derivatives by Direct Exchange from Photoaligned N-Benzylideneaniline Side Groups in Liquid Crystalline Polymeric Films

Photoalignment of liquid crystalline polymer with N-benzylideneaniline (NBA) side groups and subsequent in situ exchange achieves polarized fluorescence of oriented N-salicylideneaniline (SA) derivatives. In situ hydrolysis of NBA and condensation with 2-hydroxybenzaldehyde derivatives form oriented...

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Bibliographic Details
Published in:Chemistry letters 2023-01, Vol.52 (10)
Main Authors: Tanaka, Mizuki, Yamaguchi, Hinano, Kondo, Mizuho, Sakamoto, Moritsugu, Sasaki, Tomoyuki, Ono, Hiroshi, Kawatsuki, Nobuhiro
Format: Article
Language:eng ; fre ; ger ; jpn
Subjects:
Fluorescence
Hydroxybenzaldehydes
Liquid crystal polymers
Liquid crystals
Polymer films
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Description
Summary:Photoalignment of liquid crystalline polymer with N-benzylideneaniline (NBA) side groups and subsequent in situ exchange achieves polarized fluorescence of oriented N-salicylideneaniline (SA) derivatives. In situ hydrolysis of NBA and condensation with 2-hydroxybenzaldehyde derivatives form oriented SA side groups. SA exhibits excited state intramolecular proton transfer (ESIPT), inducing polarized fluorescence with a 2.3 polarization ratio. The emissive wavelength depends on the 2-hydroxybenzaldehyde derivative. Stepwise formation of different oriented SA side groups allows for color tuning of the oriented film.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.230317