Abstract
Bio-organometallic ferrocene-containing amino acids and peptides have been reported to form gels and are interesting to study due to their structural properties and applications for biological purposes. In this study, a ferrocene-dicarboxylic acid derivative of the dipeptide tryptophan-tryptophan was investigated. The indolic nitrogen in the amino acid tryptophan is important for biological functions due to its role in hydrogen bonding. Here, intermolecular interactions with the indolic nitrogen allow this conjugate to self-assemble into a fibrous supramolecular structure that forms a stable gel. Rheological analysis demonstrates the self-healing nature of this gel. Interestingly, X-ray analysis of this ferrocene-peptide conjugate reveals close contacts involving tryptophan, in particular the indole NH group in interactions with an adjacent neighboring molecule.
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