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Fluorophobic Effect Promoting Lamellar Self‐Assembly of Donor Acceptor Dyes
Author(s) -
Haenle Johannes Christian,
Stöckl Yannick,
Forschner Robert,
Haenle Elena,
Laschat Sabine
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201800449
Subject(s) - alkyl , chromophore , acceptor , photochemistry , chemistry , crystallography , electron acceptor , absorption (acoustics) , malononitrile , differential scanning calorimetry , materials science , organic chemistry , physics , composite material , thermodynamics , condensed matter physics , catalysis
To combine liquid crystalline and linear optical properties in the same molecule, the fluorophobic effect was probed for the first time in donor acceptor dyes. Thus, a series of mono‐, bi‐, and tricyclic donor acceptor dyes with 1 H ,1 H ‐perfluorinated alkyl chains of different lengths as donor units and nitrile, malononitrile or barbiturate as acceptor units was synthesized in 5 steps and 1.4–6.6 % overall yield. UV/Vis and fluorescence spectroscopy, cyclic voltammetry and DFT calculations revealed that absorption and emission maxima, Stokes shifts and LUMO energies were mainly governed by the chromophore size and acceptor strengths. The perfluorinated chain was electronically almost decoupled from the remaining chromophore and induced only slight changes of the absorption maxima as compared to the alkyl substituted counterparts. However, in contrast to the non‐mesomorphic alkyl donor‐substituted derivatives, the perfluorinated donors resulted in self‐assembly into partially interdigitated SmA bilayers according to differential scanning calorimetry (DSC), polarizing optical microscopy (POM), X‐ray diffraction (WAXS, SAXS) studies and electron density profile calculations.