A π-conjugated hydrogel based on an Fmoc-dipeptide naphthalene diimide semiconductor

Abstract

The beta-sheet self-assembly of an n-type NDI-dipeptide into a transparent, self-supporting hydrogel at low concentrations is described. The nanostructure of the gel is stabilized by the intermolecular pi-pi association of the NDI units and pi-pi interdigitation of the fluorene groups.

Self-Assembled Peptide Nanofibers Encapsulated with Superfine Silver Nanoparticles via Ag+ Coordination

“…9 According to previous reports, in most cases, no matter whether the fluorenyl group was in monomers or within aggregates, there was always 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 the two states. 6,9,10,27 However, an exception occurred in the present system. The characteristic signal with the maximum emission at 320 nm ( Figure S6a) was generated by monomeric fluorenyl.…”

Supramolecular Polymer Networks: Preparation, Properties, and Potential

“…Supramolecular gels typically consist of low molecular weight precursors that self-assemble into three-dimensional networks through noncovalent interactions; these materials are often brittle and hard to customize. In contrast, supramolecular polymer networks consist of covalently joined macromolecular building blocks (polymers) that are functionalized with motifs that can bind to each other through noncovalent interactions such as hydrogen bonding [21][22][23], transition metal complexation [11,24,25], hydrophobic interaction [26], ionic attraction [10], or π-π stacking [27][28][29], serving to assemble the polymer chains into a network. Noncovalent interactions strongly vary in their strength, as shown in Fig.…”

“…The microgels can be formed under physiological conditions and rapidly dissociate upon cooling to [25][26][27] C. This makes them interesting as scaffolds for temporary cell encapsulation and subsequent cell release for further cell characterization. …”

More than Meets the Eye: Conformational Switching of a Stacked Dialkoxynaphthalene–Naphthalenetetracarboxylic diimide (DAN–NDI) Foldamer to an NDI–NDI Fibril Aggregate

“…For example, Parquette et al . have reported several systems displaying NDI-NDI off-set parallel stacking in the formation of one-dimensional (1D) nanofibrils [13] and 1D nanotubes. [14] Ghosh et al .…”