Charge‐Transfer Complex Formation in Gelation: The Role of Solvent Molecules with Different Electron‐Donating Capacities

Abstract

A naphthalenediimide (NDI)-based synthetic peptide molecule forms gels in a particular solvent mixture (chloroform/aromatic hydrocarbon, 4:1) through charge-transfer (CT) complex formation; this is evident from the corresponding absorbance and fluorescence spectra at room temperature. Various aromatic hydrocarbon based solvents, including benzene, toluene, xylene (ortho, meta and para) and mesitylene, have been used for the formation of the CT complex. The role of different solvent molecules with varying electron-donation capacities in the formation of CT complexes has been established through spectroscopic and computational studies.

Solvent assisted fluorescence modulation of a C3-symmetric organogelator

“…Although such types of aggregates are usually reported to be non-emissive or weakly emissive due to rapid intraband relaxation processes there are a few reports in the literature describing luminescent H-aggregates where the observed emission was ascribed to the formation of either excimer type species or due to slight rotation of the two exciton coupled molecules in the excited state. 20 The photophysical properties of the gel formed in n-decane were very similar to those observed in the concentrated solution (Fig. S3 and Table S2 †).…”

Silver nanoparticles: facile synthesis and their catalytic application for the degradation of dyes

“…This new band may be attributed to the formation of intermolecular charge transfer (ICT) state as the molecules of derivative 3 are packed more closely during the aggregation process. 34,35 Further increase of water fraction up to 95% leads to the appearance of level-off tail (inset Fig. 1A).…”

Luminescent Naphthalene Diimide-Based Peptide in Aqueous Medium and in Solid State: Rewritable Fluorescent Color Code

“…The incorporation of a peptide unit into the NDI system affords the expansion of the library of NDI-based molecules with structural diversity and functional variability in response to the external stimuli. 20−25 Although NDIs are good candidates for supramolecular chemistry, the very weak fluorescent behavior of NDIs makes them unsuitable for fluorescent applications in optoelectronics. 26 However, a few attempts have been made to obtain fluorescent NDI nanoaggregates in solution state by developing aggregation-induced emission enhancement (AIEE) 27−31 effect through the incorporation of peptide or other moieties in the imide position and by attaching bulky substituent(s) in the aromatic core of the NDI moiety.…”