Photostability of J ‐aggregates adsorbed on TiO2 nanoparticles and AFM imaging of J ‐aggregates on a glass surface

Abdel-Mottaleb, M.M.; Auweraer, Mark Van der; Abdel‐Mottaleb, M. S. A.

doi:10.1155/s1110662x04000054

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…Relevant photodecomposition quantum yields, determined according to the Belfield method, were obtained (see Table S2 in the Supporting Information). DiD‐loaded QSs at any of the assayed loadings are more photostable (≈2 orders of magnitude) than micelle‐based nanoformulation of the same dye in water, likely due to the lower photostability of dyes' aggregates, which are more in number in the micelles than in QSs. However, DiD‐loaded QSs were found less photostable compared to the solvated DiD in EtOH and to its hydrophilic analog Cy5 dissolved in water.…”

supporting

confidence: 87%

Nanostructuring Lipophilic Dyes in Water Using Stable Vesicles, Quatsomes, as Scaffolds and Their Use as Probes for Bioimaging

Ardizzone

Illa-Tuset

Faraudo

et al. 2018

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A new kind of fluorescent organic nanoparticles (FONs) is obtained using quatsomes (QSs), a family of nanovesicles proposed as scaffolds for the nanostructuration of commercial lipophilic carbocyanines (1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indocarbocyanine perchlorate (DiI), 1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indodicarbocyanine perchlorate (DiD), and 1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indotricarbocyanine iodide (DiR)) in aqueous media. The obtained FONs, prepared by a CO -based technology, show excellent colloidal- and photostability, outperforming other nanoformulations of the dyes, and improve the optical properties of the fluorophores in water. Molecular dynamics simulations provide an atomistic picture of the disposition of the dyes within the membrane. The potential of QSs for biological imaging is demonstrated by performing superresolution microscopy of the DiI-loaded vesicles in vitro and in cells. Therefore, fluorescent QSs constitute an appealing nanomaterial for bioimaging applications.

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confidence: 87%

Nanostructuring Lipophilic Dyes in Water Using Stable Vesicles, Quatsomes, as Scaffolds and Their Use as Probes for Bioimaging

Ardizzone

Illa-Tuset

Faraudo

et al. 2018

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“…The aggregate structure on a molecular scale is hardly accessible by direct characterization techniques, such as x-ray crystallography. However, the morphology can be imaged on mesoscopic scales by advanced microscopy techniques such as electron microscopy and scanning force microscopy [46]. If the aggregates exhibit morphologies that are regularly shaped than it might be possible to draw conclusions about the structure on a molecular scale.…”

Section: Selected Aggregate Structuresmentioning

confidence: 99%

J‐aggregates of amphiphilic cyanine dyes: Self‐organization of artificial light harvesting complexes

Kirstein¹,

Daehne

2006

International Journal of Photoenergy

128

225

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The simultaneous chemical linkage of cyanine dye chromophores with both hydrophobic and hydrophilic substituents leads to a new type of amphiphilic molecules with the ability of spontaneous self-organization into highly ordered aggregates of various structures and morphologies. These aggregates carry the outstanding optical properties of J-aggregates, namely, efficient exciton coupling and fast exciton energy migration, which are essential for the build up of artificial light harvesting systems. The morphology of the aggregates depends sensitively on the molecular structure of the chemical substituents of the dye chromophore. Accordingly, lamellar ribbon-like structures, vesicles , tubes, and bundles of tubes are found depending on the dyes and the structure can further be altered by addition of surfactants, alcohols, or other additives. Altogether the tubular structure is the most noticeable structural motif of these types of J-aggregates. The optical spectra are characterized in general by a complex exciton spectrum which is composed of several electronic transitions. The spectrum is red-shifted as a total with respect to the monomer absorption and exhibits resonance fluorescence from the lowest energy transition. For the tubular structures, the optical spectra can be related to a structural model. Although the molecules itself are strictly achiral, a pronounced circular dichroism (CD) is observed for the tubular aggregates and explained by unequal distribution of left- and right-handed helicity of the tubes. Photo-induced electron transfer (PET) reactions from the dye aggregates to electron acceptor molecules lead to superquenching which proves the delocalization of the excitation. This property is used to synthesize metal nanoparticles on the aggregate surface by photo-induced reduction of metal ions.

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“…J‐ aggregation, unlike it is beneficially responsible for the longer wavelength red shifting . Surprisingly, the red shifting and absorbance observed in adsorbed MMR1 is higher compare to the MMR2 , which may cause higher aggregation due to cyanoacrylic acid as anchoring group …”

Section: Resultsmentioning

confidence: 95%

Biphenyl‐Amine‐Based D‐π‐A’‐π‐A Sensitizers for DSSCs: Comparative Photo‐Conversion Efficiency in Iodide/triiodide and Cobalt‐Based Redox Electrolyte and DFT Study

et al. 2019

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We have designed and synthesized two dye molecules viz. MMR1 ((E)‐2‐cyano‐3‐(5‐((E)‐1‐cyano‐2‐(4′‐(dimethylamino)‐[1,1′‐biphenyl]‐4‐yl)vinyl)thiophen‐2‐yl)acrylic acid) and MMR2 (2‐((Z)‐5‐((5‐((E)‐1‐cyano‐2‐(4′‐(dimethylamino)‐[1,1′‐biphenyl]‐4‐yl)vinyl)thiophen‐2‐yl)methylene)‐4‐oxo‐2‐thioxothiazolidin‐3‐yl)acetic acid) with D‐π‐A’‐π‐A frameworks. The synthesized interfacial modifiers have dimethyl aniline as the donor group whereas cyanoacetic acid and rhodanine‐3‐acetic acid as the major acceptor groups in MMR1 and MMR2 respectively. The photophysical study in solution medium shows red shifted absorption maxima (λmax) for MMR2 vs MMR1. However, the molar extinction coefficient (ϵmax) for MMR2 is found to be lower than MMR1. The photovoltaic characterization of these molecules was carried out using iodide/triiodide and cobalt (II/III) based redox electrolytes for comparision. The molecules showed improved efficiency with the cobalt based electrolytes where MMR1 showed the highest power conversion efficiency (PCE) of 3.25% (Jsc=7.28 mA/cm2, Voc=0.713 V, FF=0.63). Further to have a deep insight into these synthesized molecules DFT studies were performed. The polarizability and hyperpolarizability values for the interfacial modifiers are calculated using DFT computation and are found to be correlated to the PCE.

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Photostability of J ‐aggregates adsorbed on TiO₂ nanoparticles and AFM imaging of J ‐aggregates on a glass surface

Cited by 8 publications

References 10 publications

Nanostructuring Lipophilic Dyes in Water Using Stable Vesicles, Quatsomes, as Scaffolds and Their Use as Probes for Bioimaging

Nanostructuring Lipophilic Dyes in Water Using Stable Vesicles, Quatsomes, as Scaffolds and Their Use as Probes for Bioimaging

J‐aggregates of amphiphilic cyanine dyes: Self‐organization of artificial light harvesting complexes

Biphenyl‐Amine‐Based D‐π‐A’‐π‐A Sensitizers for DSSCs: Comparative Photo‐Conversion Efficiency in Iodide/triiodide and Cobalt‐Based Redox Electrolyte and DFT Study

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