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Spermine-directed supramolecular self-assembly of a water-soluble AIE-active tetraphenylethylene: nanobelt, nanosheet, globular and nanotubular structures

Abstract

The tetrasulfonate-tetraphenylethylene (Su-TPE) non-emissive in water and upon addition of good solvent such as THF (fTHF= 95%) displays strong fluorescence emission with quantum yield of 6.33%. In the presence of spermine, emission of Su-TPE produces higher quantum yields i.e. 1:48 molecular ratios gives 7.21%. Furthermore, interaction of spermine with Su-TPE is also shown to be pH dependent. Scanning electron microscopy (SEM) of Su-TPE molecule self-assemblies demonstrates that it produces various supramolecular structures at different Su-TPE:spermine molecular ratios. Nanobelts were obtained at 1:12, evolving to microsheets at 1:24, microglobular morphology at 1:36 and microtubues at 1:48 molecular ratios, respectively. Additionaly an enhanced fluorescence emission was observed with increasing molar ratio of spermine with Su-TPE at pH 7.The physical characterisation of the system were performed using dynamic light scattering and zeta potential.

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Publication details

The article was received on 28 May 2018, accepted on 08 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ02636J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Spermine-directed supramolecular self-assembly of a water-soluble AIE-active tetraphenylethylene: nanobelt, nanosheet, globular and nanotubular structures

    D. D. La, J. N. Malegaonkar, R. S. Bhosale, M. Al Kobaisi, S. V. Bhosale and S. Bhosale, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02636J

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