Self-complementary motifs carboxylic acids

The simplest self-complementary motif involves two-point donor-acceptor (DA) H-bonding interactions that form cyclic dimers. Carboxylic acids, for example, are ubiquitous and have been investigated for decades. Fourier transform infrared (FTIR) spectroscopy of poly(acrylic acid)s and ethylene-methacrylic acid copolymers show that dimers persist well above the glass transition temperature (Tg) of the materials [12, 13]. Furthermore, carboxylic acids can interact within polymer melts. Instead of forming dimers, they organize into clusters, providing the basis for a supramolecular network. Lillya and colleagues showed that telechelic... 

Carboxylic acids, oximes, diones and amino-pyridines can all form homomeric 0-D motifs through self-complementary and, frequently, symmetry-related hydrogen-bond interactions,... 

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