Reversible Thermochromism in Hydrogen‐Bonded Polymers Containing Polydiacetylenes

Abstract

Out of the blue: A reversible temperature‐dependent change in the absorption characteristics of spin‐coated terephthalic acid/diacetylene polymers is observed. The polymer is prepared by topochemical photopolymerization of the diacetylene side chains of the stacked terephthalic acid units (see picture). The absorption bands of the polymeric product move reversibly from 640 nm (blue form of the polymer) to 580 nm (red form) during heating–cooling cycles.

Rational Design of Conjugated Polymer Supramolecules with Tunable Colorimetric Responses

“…[47] Recently, Lee and coworkers designed a new and interesting PDA system which participates in reversible thermochromism. [87] A spin-coated polymerized thin film, obtained from the bisdiacetylene-substituted terephthalic acid 2, was found to show complete colorimetric reversibility during repetitive heating and cooling cycles. The hydrogen-bonding networks formed between the aromatic dicarboxylic acids are presumably responsible for the reversible chromism.…”

A Combinatorial Approach for Colorimetric Differentiation of Organic Solvents Based on Conjugated Polymer‐Embedded Electrospun Fibers

“…[1] Among the conjugated polymers reported to date, PDAs are unique in several regards. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] First, these polymers can be prepared from supramolecularly assembled crystalline or semi-crystalline states of diacetylene (DA) monomers. Conventional solution-based chemical approaches typically employed for the preparation of conjugated polymers do not yield PDAs efficiently.…”

Functional, Hierarchically Structured Poly(diacetylene)s via Supramolecular Self‐Assembly

“…[38][39][40][41][42][43][44] However, only few examples of diacetylene polymerizations carried out in hydrogenbonded organogels and supramolecular polymers are known to date. [45][46][47][48][49][50] Supramolecular self-assembly in solution and topochemical diacetylene polymerizations are ''a perfect couple''. While the latter offer an advantageous way of covalent capture which produces well-defined, optoelectronically active polymers, self-assembly would ideally provide the required order without being confined to single-crystalline monomers and include a self-healing of structural defects.…”