Ester-Based Synthetic Information Oligomers
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Abstract
Nature has long inspired chemists to replicate the molecules produced by evolution. Arguably, the most important of these are the nucleic acids because of the ability to store and transfer information through duplex formation using Watson-Crick base pairing. Biochemists have prepared modified DNA analogues, in which the phosphate diester units used for synthesis, the bases used for recognition, and the sugar backbones have all been replaced. These systems have been found to form stable duplexes, so it is clear that the precise structure of these three modules is not crucial for information manipulation through a sequence-selective duplex formation. This non-uniqueness of the structure of the nucleic acids with respect to their function provides a challenge for synthetic chemists to design information molecules capable of directed evolution. A range of oligomeric and polymeric materials has been reported that are capable of duplex-formation and site-specific recognition, but few functional materials based on a sequence of supramolecular interactions are known.
Herein, we present efforts towards a new family of oligomers that contain a sequence of hydrogen-bonding recognition sites, used as the bits for binary data encoded in an organic information molecule. Several monomer designs were implemented and investigated, and the final system uses single-point hydrogen bond recognition motifs between electron-deficient phenols (D) and electron-rich phosphine oxides (A), which provide strong interactions in non-polar solvents (K