Structure and Growth Mechanism of J-Aggregates of a Cyanine Dye Adsorbed on AgBr Grains from Thermodynamic Analysis of the Dye Desorption Process

1997 ◽  
Vol 101 (12) ◽  
pp. 2149-2153 ◽  
Author(s):  
Hiroyuki Asanuma ◽  
Tadaaki Tani
Keyword(s):  
Thermodynamic Analysis ◽  
Growth Mechanism ◽  
Cyanine Dye ◽  
Desorption Process ◽  
J Aggregates

scholarly journals Exploiting cyanine dye J-aggregates/monomer equilibrium in hydrophobic protein pockets for efficient multi-step phototherapy: An innovative concept for smart nanotheranostics

Nanoscale ◽  
2021 ◽  
Author(s):  
Matias Luis Picchio ◽  
Julian Bergueiro Álvarez ◽  
Stefanie Wedepohl ◽  
Roque J Minari ◽  
Cecilia Ines Alvarez Igarzabal ◽  
...  
Keyword(s):  
Indocyanine Green ◽  
Contrast Agent ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Cyanine Dye ◽  
Hydrophobic Protein ◽  
Nir Dyes ◽  
Protein Pockets ◽  
J Aggregates ◽  
Innovative Concept

After several decades of development in the field of near-infrared (NIR) dyes for photothermal therapy (PTT), indocyanine green (ICG) still remains the only FDA-approved NIR contrast agent. However, upon NIR...

Molecular Arrangement in Cyanine Dye J-Aggregates Formed on CeO2 Nanoparticles

2018 ◽  
Vol 122 (36) ◽  
pp. 20996-21003 ◽  
Author(s):  
Svetlana L. Yefimova ◽  
Ganna V. Grygorova ◽  
Vladimir K. Klochkov ◽  
Igor A. Borovoy ◽  
Alexander V. Sorokin ◽  
...  
Keyword(s):  
Ceo2 Nanoparticles ◽  
Cyanine Dye ◽  
Molecular Arrangement ◽  
J Aggregates

scholarly journals J-aggregates of amphiphilic cyanine dyes: Self-organization of artificial light harvesting complexes

2006 ◽  
Vol 2006 ◽  
pp. 1-21 ◽  
Author(s):  
Stefan Kirstein ◽  
Siegfried Daehne
Keyword(s):  
Structural Model ◽  
Light Harvesting ◽  
Optical Spectra ◽  
Cyanine Dye ◽  
Structural Motif ◽  
Self Organization ◽  
Artificial Light ◽  
Light Harvesting Complexes ◽  
Unequal Distribution ◽  
J Aggregates

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.

scholarly journals Up-converted luminescence of cyanine dye J-aggregates

2005 ◽  
Vol 112 (1-4) ◽  
pp. 416-419 ◽  
Author(s):  
K. Miyasue ◽  
T. Honma ◽  
S. Kurita ◽  
T. Sekiya ◽  
M. Nakajima ◽  
...  
Keyword(s):  
Cyanine Dye ◽  
J Aggregates

Anomalous Surfactant-Induced Enhancement of Luminescence Quantum Yield of Cyanine Dye J-Aggregates

2008 ◽  
Vol 112 (38) ◽  
pp. 14762-14768 ◽  
Author(s):  
Gleb Ya. Guralchuk ◽  
Ivan K. Katrunov ◽  
Roman S. Grynyov ◽  
Alexander V. Sorokin ◽  
Svetlana L. Yefimova ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Cyanine Dye ◽  
Luminescence Quantum Yield ◽  
J Aggregates

scholarly journals J-Aggregates of Cyanine Dyes in Aqueous Solution of Polymers: A Quantitative Study

2004 ◽  
Vol 3 (3) ◽  
Author(s):  
Wesley Tillmann ◽  
Hussein Samha
Keyword(s):  
Aqueous Solution ◽  
Quantitative Study ◽  
Aggregation Number ◽  
Cyanine Dyes ◽  
Cyanine Dye ◽  
Isosbestic Point ◽  
Maximum Capacity ◽  
Vis Spectroscopy ◽  
J Aggregates

The effect of polyvinylsulfate (PVS) on the spectroscopy of the cyanine dye, 1,1’-diethyl-2,2’-cyanine iodide (PIC), has been investigated using UV-vis spectroscopy. J-aggregates of the PIC dye were formed upon addition of PVS to the monomers of the dye in solution. The appearance of only one isosbestic point in the UV-vis spectra suggests that the dye monomers are quantitatively converted to J-aggregates and equilibrium was reached. Using Benisi-Hildebrand kinetics, aggregation number of 4 was calculated for the dye. In addition, a 1:2 mole ratio of PIC/PVS was calculated at the maximum capacity of the polymer.

J-Aggregates of Cyanine Dye for NIR-II in Vivo Dynamic Vascular Imaging beyond 1500 nm

2019 ◽  
Vol 141 (49) ◽  
pp. 19221-19225 ◽  
Author(s):  
Caixia Sun ◽  
Benhao Li ◽  
Mengyao Zhao ◽  
Shangfeng Wang ◽  
Zuhai Lei ◽  
...  
Keyword(s):  
Vascular Imaging ◽  
Cyanine Dye ◽  
J Aggregates

scholarly journals Molecular Distribution Behavior of Cyanine Dyes in Aqueous Solution

2009 ◽  
Vol 7 (4) ◽  
Author(s):  
David Baumann ◽  
Bryan Clark ◽  
Jared Garlick ◽  
Hussein Samha
Keyword(s):  
Aqueous Solution ◽  
Narrow Band ◽  
Ammonium Phosphate ◽  
Emission Spectra ◽  
Cyanine Dye ◽  
Concentrated Solutions ◽  
Molecular Distribution ◽  
J Aggregates ◽  
Absorption And Emission Spectroscopy ◽  
Distribution Behavior

The molecular distribution of the cyanine dye (5-chloro-2-[3-[5-chloro-3-(4-sulfobutyl)-2(3H)-benzothiazolylidine]-1-propenyl]-3-(4-sulfobutyl)-benzothiazolium hydroxide triethylamine salt, NK-3796) in aqueous solution was investigated using absorption and emission spectroscopy. Dimers of the dye are formed in concentrated solutions, while monomers dominate more diluted solutions. J aggregates are formed in solutions containing electrolytes such as sodium chloride, calcium chloride, and di-hydrogen ammonium phosphate. The dye readily forms J aggregates upon mixing with electrolyte. The J aggregates formation was followed spectroscopically by the appearance of a red-shifted narrow band centered at 653 nm in the absorption spectra. A similar shift is also observed in the emission spectra. The absorbance bandwidth is dependent on the charge of the cation of the electrolyte. This suggests different ground-state conformations for the J aggregates in solution.

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