Teaching New Tricks to
an Old Indicator: pH-Switchable,
Photoactive Microporous Polymer Networks from Phenolphthalein with
Tunable CO<sub>2</sub> Adsorption Power
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Abstract
Switchable, organic microporous networks were synthesized
by Sonogashira
coupling of tetrabromophenolphthalein with 1,4-diethynylenebenzene
using optimized reaction conditions. The resulting networks are microporous
and have specific surface areas exceeding 800 m<sup>2</sup> g<sup>β1</sup>. The microporosity and the pore polarity are sensitive
to the pH value as evidenced by nitrogen and carbon dioxide physisorption
experiments. The switching between the open and closed form of the
lactone ring is reversible, but some porosity is lost throughout the
process. The colored, alkaline salts of these networks are photochemically
active, as shown by the effective heterogeneous photosensitization
of the photopolymerization of methyl methacrylate with visible light