Photochromism of dihydroindolizines. Part XXII: Significant effect of region B substituents on tuning the photophysical properties of photochromic dihydroindolizines: Absorption, kinetic and computational studies

Guesmi, Nizar El; Ahmed, Saleh A.; Maurel, François; Althagafi, Ismail; Khairou, Khalid S.

doi:10.1016/j.jphotochem.2017.08.036

Cited by 11 publications

(1 citation statement)

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“…We also developed several series of polynorbornene containing aryl- and hetaryl-azo chromophores as candidates for long-term storage information, as well as in photonic devices [ 62 ]. Our previous work has also been dedicated to the synthesis of various classes of chromogenic molecules containing a spiro carbon, such as benzopyrans, oxazines, and dihydroindolizines, which are appropriate chemosensors that respond to external stimuli, including temperature [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Thermochromic Polynorbornene Bearing Spiropyran Chromophore Moieties: Synthesis, Thermal Behavior and Dielectric Barrier Discharge Plasma Treatment

et al. 2017

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Abstract:A new class of thermochromic polynorbornene with pendent spiropyran moieties has been synthesized. Functionalization of norbornene monomers with spirobenzopyran moieties has been achieved using Steglich esterification. These new monomeric materials were polymerized via Ring Opening Metathesis Polymerization (ROMP). In spite of their poor solubility, polynorbornenes with spirobenzopyran exhibited thermochromic behavior due to the conversion of their closed spiropyran moieties to the open merocyanine form. Moreover, these polymers displayed bathochromic shifts in their optical response, which was attributed to the J-aggregation of the attached merocyanine moieties that were associated with their high concentration in the polymeric chain. The surface of the obtained polymers was exposed to atmospheric pressure air Dielectric Barrier Discharge (DBD) plasma system, which resulted in the reduction of the surface porosity and converted some surface area into completely non-porous regions. Moreover, the plasma system created some areas with highly ordered J-aggregates of the merocyanine form in thread-like structures. This modification of the polymers' morphology may alter their applications and allow for these materials to be potential candidates for new applications, such as non-porous membranes for reverse osmosis, nanofiltration, or molecular separation in the gas phase.

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