In this work, a series of naphthalimide fused thienopyrazine derivatives was designed, and their synthesis and characterization are reported herein. The interaction of this building block with a donor terthiophene...
A new
rod-shaped benzothiadiazole fluorophore, namely, 4,7-di-(4-nonylphenyl)benzo[c][1,2,5]thiadiazole, which strongly emits fluorescence
both in solution and in solid state has been synthesized, and its
photophysical properties were rationalized with the help of density
functional theory calculations. This molecule crystallizes in two
distinct light-emitting crystalline phases, which can be interconverted
in response to pressure, temperature, and solvent vapors. Powder X-ray
diffraction indicates that in both polymorph, molecules adopt a lamellar
packing, the different interlayer spacing being the main difference
between the two structures. Single-crystal analysis of one of the
polymorphs allows us to identify weak interaction planes, which presumably
facilitates the polymorphic transformation through mechanically or
thermally induced sliding processes. The polymorphic transformation
and the origin of the switchable fluorescence have been rationalized
through a spectroscopic and theoretical study. This study suggests
that the different colors observed are due to different intermolecular
aromatic interactions owing to the displacement of the molecules with
respect to the layer normal. Interestingly, blending this molecule
with a biodegradable polymer such as poly(vinyl alcohol) gives rise
to a thermally activated reversible switchable fluorescent system,
which entitles this material as an attractive candidate for technological
applications, such as thermal sensors, security inks, or rewritable
paper.
In this work, a series of nitrogen-doped polycyclic aromatic mono and dicarboximides was designed, and their synthesis is reported by an innovative synthetic procedure that avoids metal-based cross-coupling reactions. A...
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