J-aggregate formation behavior of a cationic cyanine dye on inorganic layered material

Sato, Narumi; Fujimura, Takuya; Shimada, Takahiro; Tani, Tadaaki; Takagi, Shinsuke

doi:10.1016/j.tetlet.2015.04.084

Cited by 25 publications

(19 citation statements)

References 25 publications

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“…Porphyrin based supramolecular self-assemblies have been considered as emerging nanomaterials for optoelectronics, catalysis, light energy conversion and sensing applications. [1][2][3][4][5][6][7][8][9] Morphology of self-assemblies is governed by the intermolecular π-π electronic coupling which controls the properties of the aggregates. [10][11][12] Aggregation stimulates the extent of coherent electronic delocalization through the strong intermolecular π-π electronic coupling among the cooperatively aligned chromophoric units and the properties of aggregates may also differ with size as well as shape of the aggregated moieties.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Morphology‐Controlled Ultrafast Relaxation Processes of Aggregated Porphyrin

et al. 2020

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Here, we have synthesized rod and flake shaped morphology of porphyrin aggregates from 5, 10, 15, 20-tetra (4-n-octyloxyphenyl) porphyrin (4-opTPP) molecule which are evident from scanning electron microscopy (SEM). The formation of J-type aggregation is evident from steady state and time-resolved fluorescence spectroscopic studies. Ultrafast transient absorption spectroscopic studies reveal that the excited state lifetime is controlled by the morphology and the time constant for S 1 ! S 0 relaxation changes from 3.05 ps to 744 ps with changing the shape from rod to flake, respectively. In spite of similar exciton coupling energy in both the aggregates, the flake shaped aggregates undergo a faster exciton relaxation process and the non-radiative relaxation channels are found to depend on the shape of aggregates. The fundamental understanding of morphology controlled ultrafast relaxation processes of aggregated porphyrin is important for designing efficient light harvesting devices.

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Section: Introductionmentioning

confidence: 99%

“…Porphyrin based supramolecular self‐assemblies have been considered as emerging nanomaterials for optoelectronics, catalysis, light energy conversion and sensing applications . Morphology of self‐assemblies is governed by the intermolecular π‐π electronic coupling which controls the properties of the aggregates .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Morphology‐Controlled Ultrafast Relaxation Processes of Aggregated Porphyrin

et al. 2020

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“…Одной из особенностей полиметиновых красителей является их склонность к образованию молекулярных агрегатов в водных средах [21]. Оптические свойства агрегатов полиметиновых красителей [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] отличаются от свойств мономеров и делают агрегаты пригодными для практических применений в нанофотонике [41][42][43][44][45], солнечной энергетике [46][47][48], наноплазмонике [49][50][51], а также других направлениях [32,34,40,[52][53][54][55].…”

Section: Introductionunclassified

Спектральные Свойства Индотрикарбоцианинового Красителя В Процессе Самоорганизации Его H-=sup=-*-=/Sup=-- И J-Агрегатов

Белько¹,

Самцов²,

Луговский³

2020

Журнал Технической Физики

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Self-assembly of H*- and J-aggregates of an indotricarbocyanine dye in phosphate buffered saline was investigated. At pH value of 7.0 the dye studied was shown to form non-luminescent H*-aggregates with the absorption band peaked at 516 nm, its FWHM being 35 nm (1303 cm-1), whereas, J-aggregates are absent. At pH value of 7.4 the H*-aggregates are not formed, whereas, the J-aggregates are observed. The absorption band of the J-aggregates is peaked at 777 nm, its FWHM being 30 nm (497 cm-1). Photoluminescence quantum yield of the J-aggregates does not exceed 10-6. An increase in the solution temperature from 20 to 31oC results in a 25-fold decrease in the self-assembly time of the H*-aggregates. An increase in the solution temperature from 20 to 80oC is followed by a reversible decay of both the H*- and J-aggregates. The H*-aggregate (J-aggregate) absorption band is reduced two-fold at the solution temperature of 37oC (32oC). Thansitions of the dye aggregates to high-lying electronic excited states were evidenced in the steady-state absorption in the spectral range between 400 and 480 nm.

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“…Absorption and emission bands of cyanine dyes located in the spectral transparency range of biological tissues (700-900 nm) is the most important advantage enabling their use in biomedicine [25,26]. However, many compounds of this class are poorly soluble in water [23,[27][28][29][30][31][32][33][34]. Thus, substituents that make the compounds hydrophilic are introduced [33,[35][36][37] or various conjugates are constructed [34,38] to provide biocompatible structures.…”

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Spectral Properties of an Indotricarbocyanine Dye upon Complexation by Detonation Nanodiamonds and Blood Serum Proteins

et al. 2020

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Spectral properties of an indotricarbocyanine dye upon complexation with nanodiamonds in aqueous solutions were studied. Complexation was accompanied by disappearance of the H * -aggregate absorption band at 514 nm and a bathochromic shift of long-wavelength absorption maxima from 706 to 718 nm. The dye emission spectrum was almost unchanged. The fl uorescence excitation peak shifted from 706 to 710 nm. The dye carboxyl groups played an important role in the complexation of the dye to nanodiamonds based on an analysis of the IR absorption spectra. The complexes broke down and the dye molecules bonded to serum proteins in the presence of human blood serum. This was confi rmed by signifi cant increases in the fl uorescence lifetime and anisotropy. The obtained complexes could be used as a basis for fl uorescent biosensors.

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J-aggregate formation behavior of a cationic cyanine dye on inorganic layered material

Cited by 25 publications

References 25 publications

Investigation of Morphology‐Controlled Ultrafast Relaxation Processes of Aggregated Porphyrin

Investigation of Morphology‐Controlled Ultrafast Relaxation Processes of Aggregated Porphyrin

Спектральные Свойства Индотрикарбоцианинового Красителя В Процессе Самоорганизации Его H-=sup=-*-=/Sup=-- И J-Агрегатов

Spectral Properties of an Indotricarbocyanine Dye upon Complexation by Detonation Nanodiamonds and Blood Serum Proteins

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