Abstract
The assembly of a peptide-tetrathiophene-peptide (PTP) conjugate has been investigated in mixed solvents, which has different polarities by changing the solvent proportions. It was found that PTP can form fibers in THF/hexane solutions with 40–80%v of hexane. The fibers were stable and did not change on time. On the other hand, PTP formed ordered structures in a mixed solution with the water content from 40 to 60%v. For the as-prepared solutions, two nanostructures vesicles and parallelogram sheets were obtained. The parallelogram sheets could transform into vesicles on time. The fibers showed supramolecular chirality, however, there was no Cotton effect for vesicles and parallelogram sheets. UV-vis, FL, XRD, FT-IR, and CD spectra together with SEM, AFM, TEM were used to characterize the nanostructures and properties of the assemblies. Molecular packing mechanism was proposed based on the experimental data.
Highlights
The performance of the functional materials based on these systems is largely affected by the nanostructures of the assemblies, the manipulation of the nanostructures is one of the most important issue to tune their properties (Ajayaghosh et al, 2006; Zhang et al, 2009; George et al, 2012; Mitra et al, 2013; Shin et al, 2013; Baram et al, 2014; Liu et al, 2014)
Wei and et al reported a sugarbased amphiphilic perylene diimide derivative (PTCDI-HAG) which self-assembled into two kinds of fibers with opposite supramolecular chirality by using binary solvents (Huang et al, 2011)
Yao and Zhan et al showed that the chirality of nanohelices formed from a tripeptide-perylene diimide (PDI) conjugate could be reversed through heating and ultrasound treatment (Ke et al, 2013)
Summary
The performance of the functional materials based on these systems is largely affected by the nanostructures of the assemblies, the manipulation of the nanostructures is one of the most important issue to tune their properties (Ajayaghosh et al, 2006; Zhang et al, 2009; George et al, 2012; Mitra et al, 2013; Shin et al, 2013; Baram et al, 2014; Liu et al, 2014). A peptide-tetrathiophene-peptide (PTP) conjugate (Figure 1) was used as a model object to explore the manipulation of morphology and supramolecular chirality of the assemblies via changing the solvent polarity. For PTP in THF/hexane solution with a concentration at 0.1 mg/mL, it was observed that ordered nanostructures could be formed only in a certain range of hexane content (40–80%v).
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