the surfactant-induced formation of J- and H-aggregates in aqueous pseudoisocyanine solutions

Mchedlov‐Petrossyan, Nikolay O.; Shapovalov, S. A.; Koval, Valentina L.; Shakhverdov, T. A.; Bochkaryov, Yuriy A.

doi:10.1016/0143-7208(92)87009-p

Cited by 17 publications

(34 citation statements)

References 11 publications

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“…15,16 Besides, it was shown that the cationic cyanine dyes can have enhanced aggregation in the presence of anionic surfactants at the concentration below the CMC, whereas, at the concentration above the CMC the anionic surfactant prevents the aggregation of the dye molecules. 24 Thus, our results on absorption spectra well correlate with the previous findings. 15,16,24 To understand the nature of the additional absorbance, the PL spectra and PLE maps 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 astraphloxin (Figure 2a).…”

Section: Resultssupporting

confidence: 82%

“…24 Thus, our results on absorption spectra well correlate with the previous findings. 15,16,24 To understand the nature of the additional absorbance, the PL spectra and PLE maps 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 astraphloxin (Figure 2a). Besides, the low intensity PL peak appears at λ EX = 590 nm and λ EM = 635 nm as well as the weak PL shoulders form in the range of λ EX = 450-560 nm and λ EM = 590-640 nm ( Figure 3a).…”

Section: Resultssupporting

confidence: 82%

“…No aggregate features observed at the premicellar concentration appear in the micellar concentration mixtures, and thus, in overall, this phenomenon correlates with results for other cyanine dyes. 24 It evidences a formation of micelles around astraphloxin leading to an isolation of the dye molecules and a prevention of possible aggregation. However, the micelle formation does not interfere with the RET from astraphloxin to SWNT with λ EX = 555-560 nm, and hence there are no new features at λ EX = 576 nm in the PLE maps.…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

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Emergence of Additional Visible-Range Photoluminescence Due to Aggregation of Cyanine Dye: Astraphloxin on Carbon Nanotubes Dispersed with Anionic Surfactant

et al. 2016

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Self-organization of organic molecules with carbon nanomaterials leads to formation of functionalized molecular nano-complexes with advanced features. We present a study of physical and chemical properties of carbon nanotube-surfactant-indocarbocyanine dye (astraphloxin) in water focusing on aggregation of the dye and resonant energy transfer from the dye to the nanotubes. Self-assembly of astraphloxin is evidenced in absorbance and photoluminescence depending dramatically on the concentrations of both the dye and surfactant in the mixtures. We observed an appearance of new photoluminescence peaks in visible range from the dye aggregates.The aggregates characterized with red shifted photoluminescence peaks at 595, 635 and 675 nm are formed mainly due to the presence of surfactant at the premicellar concentration. The energy transfer from the dye to the nanotubes amplifying near-infrared photoluminescence from the nanotubes is not affected by the aggregation of astraphloxin molecules providing important knowledge for further development of advanced molecular nano-complexes. The aggregation with the turned-on peaks and the energy transfer with amplified photoluminescence create powerful tools of visualization and/or detection of the nanotubes in visible and near-infrared spectral range, respectively, boosting its possible applications in sensors, energy generation/storage, and healthcare.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 82%

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

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Emergence of Additional Visible-Range Photoluminescence Due to Aggregation of Cyanine Dye: Astraphloxin on Carbon Nanotubes Dispersed with Anionic Surfactant

et al. 2016

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“…3A and B). This behavior emphasizes the formation of H-aggregates with increasing dye concentration, since H-aggregates do not exhibit fluorescence [31] (Scheme 2).…”

Section: Uv-vis Diffuse Reflectance and Fluorescence Measurements Of mentioning

confidence: 82%

“…1C, for SWy-1 clay, a shoulder appears longer wavelength than α-band, is characteristic of the J-aggregates of dye [28][29][30][31].…”

Section: Uv-vis Diffuse Reflectance and Fluorescence Measurements Of mentioning

confidence: 96%

Photophysics of Auramine O adsorbed on solid clays

Valandro

Poli

Neumann

et al. 2015

Journal of Luminescence

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Driving Helical Packing of a Cyanine Dye on Dendron Nanofiber: Gel‐Shrinkage‐Triggered Chiral H‐Aggregation and Enhanced Enantiodiscrimination

Qin

Xie

Jin

et al. 2015

Chemistry A European J

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An intelligent molecular hydrogel with a volume phase transition was constructed to regulate the chiral packing of a well-known cyanine dye on a dynamically self-assembled chiral nanofiber by using a pH trigger. During the shrinkage of the gel, the chiral nanofiber hierarchically assembled into a superhelix and simultaneously drove the dye molecules to stack, from a predominantly monomer form, in an unexpected helical H-aggregation manner. Through such a transformation, the supramolecular chirality of the system was significantly enhanced and a new property of visual discrimination for chiral amines emerged.

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the surfactant-induced formation of J- and H-aggregates in aqueous pseudoisocyanine solutions

Cited by 17 publications

References 11 publications

Emergence of Additional Visible-Range Photoluminescence Due to Aggregation of Cyanine Dye: Astraphloxin on Carbon Nanotubes Dispersed with Anionic Surfactant

Emergence of Additional Visible-Range Photoluminescence Due to Aggregation of Cyanine Dye: Astraphloxin on Carbon Nanotubes Dispersed with Anionic Surfactant

Photophysics of Auramine O adsorbed on solid clays

Driving Helical Packing of a Cyanine Dye on Dendron Nanofiber: Gel‐Shrinkage‐Triggered Chiral H‐Aggregation and Enhanced Enantiodiscrimination

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