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New Journal of Chemistry
Page 6 of 7
DOI: 10.1039/C7NJ01136A
ARTICLE
stacking interactions between fluorene units. The
Journal Name
π
…π
Laukhin, J. Veciana and C. Rovira, Adv. Mater. 2010, 22,
4198; (b) A. Brillante, I. Bilotti, F. Biscarini, R. G. D. Valle and
benzene molecules included in the crystal lattice completely
modulated the molecular packing and intermolecular
interactions. The weak intermolecular interactions between
benzene and phenyl hydrogen stabilize benzene molecules in
E. Venuti, Chem. Phys. 2006, 328, 125.
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the crystals. The prevention of π…π stacking between fluorene
units lead to strong fluorescence in the solid state. TPPFY-1
was irreversibly converted to TPPFY-1 by heating or strong
mechanical crushing. However, recrystallization from benzene
produces fluorescent TPPFY-2 again. The difference in the
intermolecular interactions and molecular packing was further
confirmed by Hirshfeld surface analysis. Thus benzene solvent
played significant role on the structural transformation as well
as stimuli responsive reversible fluorescent properties of
TPPFY in the solid state.
(
e) A. Fernández-Mato, M. D. García, C. Peinador, J. M.
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Acknowledgement
Financial supports from the Science and Engineering Research
Board (SERB), New Delhi, India (SERB No. EMR/2015/00-1891,
SB/FT/CS-182/2011) is acknowledged with gratitude. EMM
thanks SERB, India for young scientist grant (SB/FT/CS-
8
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acknowledged for absorption spectroscopy. We thank Mr. P.
Ramkumar, PSNCET for help in repeating the synthesis.
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