Abstract
Structural understanding and correlation of physical properties of supramolecular networks can lead to improved design strategies for advanced optoelectronic materials. Herein, we demonstrate via single-crystal X-ray diffraction (SCXRD) analysis how end groups (ester and acid) of bola-amphiphilic oligo-(p-phenyleneethynylenes) (OPEs) lead to different supramolecular network formations and also generate selective polymorphism and mechanochromic luminescence in OPE-Cgly-A and OPE-Cgly-E, respectively. OPE-Cgly-E and OPE-Cgly-A have the same π-conjugated backbones with bistriethyleneglycol side chains, only differing in possessing end-capped ester and acid groups, respectively. OPE-Cgly-E has a less densely packed structure than OPE-Cgly-A. This leads to exclusive mechanochromic behavior in OPE-Cgly-E, whereas OPE-Cgly-A generates reversible polymorphic structures which are not present in OPE-Cgly-E. Density functional theoretical calculations reveal that breakage of weak supramolecular interactions in OPE-C...
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