Polyelectrolyte-induced H-aggregation of Merocyanine 540 and its application in metal ions detection as a colorimetric sensor

Bayraktutan, Tuğba; Onganer, Yavuz; Meral, Kadem

doi:10.1016/j.snb.2015.11.115

Cited by 17 publications

(9 citation statements)

References 48 publications

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“…Along with monomer and dimer peaks, at 422 nm MC540 exhibits a broad absorption band due to the H-aggregates. These H-aggregates are nonfluorescent and form because of the face-to-face stacking of the monomeric form of the dye . For lower concentrations of the dye-SAIL pair, fibrillar morphology forms through head to head or edge to edge packing and grows along one direction.…”

Section: Resultsmentioning

confidence: 99%

“…These H-aggregates are nonfluorescent and form because of the face-to-face stacking of the monomeric form of the dye. 55 For lower concentrations of the dye-SAIL pair, fibrillar morphology forms through head to head or edge to edge packing and grows along one direction. Segota et al 56 have reported that the attraction between the counterions decreases the effective area of the headgroups of the building blocks.…”

Section: Langmuirmentioning

confidence: 99%

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Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

et al. 2017

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In this article, anionic lipophilic dye merocyanine 540(MC540) and cationic surface-active ionic liquid (SAIL) 1-octyl-3-methylimidazolium chloride (CmimCl) are employed to construct highly ordered fibrillar and vesicular aggregates exploiting an ionic self-assembly (ISA) strategy. It is noteworthy that the concentration of the counterions has exquisite control over the morphology, in which lowering the concentration of both the building blocks in a stoichiometric ratio of 1:1 provides a vesicle to fibril transition. Here, we have reported the concentration-controlled fibril-vesicle transition utilizing the emerging fluorescence lifetime imaging microscopy (FLIM) technique. Furthermore, we have detected this morphological transformation by means of other microscopic techniques such as field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and cryogenic-transmission electron microscopy (cryo-TEM) to gain additional support. Besides, multiwavelength FLIM (MW-FLIM) and atomic force microscopy (AFM) techniques assist us in knowing the microheterogeneity and the height profile of the vesicles, respectively. We have replaced the SAIL, CmimCl, by an analogous traditional surfactant, n-octyltrimethylammonium bromide (OTAB), and it provides a discernible change in morphology similar to that of CmimCl, whereas 1-octanol is unable to exhibit any structural aggregation and thus reveals the importance of electrostatic interaction in supramolecular aggregate formation. However, the SAILs having the same imidazolium headgroup with different chain lengths other than CmimCl are unable to display any structural transition and determine the importance of the correct chain length for efficient packing of the counterions to form a specific self-assembly. Therefore, this study reveals the synergistic interplay of electrostatic, hydrophobic, and π-π stacking interactions to construct the self-assembly and their concentration-dependent morphological transition.

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Section: Resultsmentioning

confidence: 99%

Section: Langmuirmentioning

confidence: 99%

Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

et al. 2017

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“…Often these assemblies, assisted by noncovalent interactions, are found to be sensitive to temperature. 64,65 Thus, the response of the present supramolecular assembly towards temperature has been investigated by performing steady-state emission measurements of the current assembly at varying temperatures, and the obtained results are presented in Figure 11.…”

Section: Methodsmentioning

confidence: 99%

Anionic Polyelectrolyte-Induced Aggregation of Basic Orange 21: A Clue toward Metachromasia

2021

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The change in the color of chromophore upon being embedded in a biological tissue is known as metachromasia. Basic Orange 21 (BO21) is a cationic polymethine dye that has been implied as a supravital dye, which produces metachromasia in leukocytes. An improved differential counting of leukocytes has been achieved in the clinical setup based on characteristic metachromatic expressions of BO21 for different types of leukocytes. Although BO21 has been utilized as a chromatic indicator for leukocyte counting, there are limited number of investigations that focus on the factors that may be responsible for the spectral shift in absorption and emission spectra of BO21, which leads to its metachromatic behavior. In this work, we have investigated the effect of a synthetic anionic polyelectrolyte, polystyrene sulfonate (PSS), on the photophysical properties of BO21, using steady-state emission, ground-state absorption, and time-resolved emission measurements, to get an understanding of the factors that may be responsible for the spectral shift of BO21 in the cellular environment. PSS induces aggregation of BO21 molecules with large changes in its photophysical properties; this appears to be most likely the mechanism of spectral shift for BO21 reported in the cellular environment. The employment of external stimulus reveals BO21 aggregates to be significantly responsive toward external stimuli, for example, temperature and presence of salt in the medium, which further strengthens the proposal of aggregate formation. Further, we have also employed fluorescence upconversion spectroscopy with subpicosecond time resolution to estimate the excited-state lifetime of BO21.

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“…19 Because of its success in detecting microenvironment changes, MC540 is used as a fluorescence probe in many sensor studies. 20,21 On the other hand, the PC compound is also used in many fields such as chemical sensors, laser dyes, solar cells, and semiconductors. 22 The two metal ions have responded to this sensor system based on FRET between PC and MC540.…”

Section: Introductionmentioning

confidence: 99%

“…Also, these two moieties are bound by a chain containing four conjugated methane groups 19 . Because of its success in detecting microenvironment changes, MC540 is used as a fluorescence probe in many sensor studies 20,21 . On the other hand, the PC compound is also used in many fields such as chemical sensors, laser dyes, solar cells, and semiconductors 22 …”

Section: Introductionmentioning

confidence: 99%

Detection of Al³⁺ and Fe³⁺ Ions with Phthalocyanine‐Merocyanine 540 Dye‐Based Fluorescence Resonance Energy Transfer

Bayraktutan

Gür

Demirbaş

2020

Bulletin Korean Chem Soc

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In this study, a sensor system was designed to detect metal ions based on the fluorescence resonance energy transfer (FRET) process between free-phthalocyanine (PC) and merocyanine 540 (MC540). Following the determination of parameters and appropriate conditions for energy transfer, the sensor system was tested with different metal ions. The conclusion was that the system showed high selectivity to iron and aluminum ions. In this FRET system, limit of detection (LOD) values for metal ions were calculated as 437 nM for Al 3+ and 32.1 nM for Fe 3+. The system was able to detect iron and aluminum in very low concentrations. It also showed good selectivity for the two metal ions.

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Polyelectrolyte-induced H-aggregation of Merocyanine 540 and its application in metal ions detection as a colorimetric sensor

Cited by 17 publications

References 48 publications

Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

Anionic Polyelectrolyte-Induced Aggregation of Basic Orange 21: A Clue toward Metachromasia

Detection of Al³⁺ and Fe³⁺ Ions with Phthalocyanine‐Merocyanine 540 Dye‐Based Fluorescence Resonance Energy Transfer

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Polyelectrolyte-induced H-aggregation of Merocyanine 540 and its application in metal ions detection as a colorimetric sensor

Cited by 17 publications

References 48 publications

Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

Concentration-Driven Fascinating Vesicle-Fibril Transition Employing Merocyanine 540 and 1-Octyl-3-methylimidazolium Chloride

Anionic Polyelectrolyte-Induced Aggregation of Basic Orange 21: A Clue toward Metachromasia

Detection of Al3+ and Fe3+ Ions with Phthalocyanine‐Merocyanine 540 Dye‐Based Fluorescence Resonance Energy Transfer

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Detection of Al³⁺ and Fe³⁺ Ions with Phthalocyanine‐Merocyanine 540 Dye‐Based Fluorescence Resonance Energy Transfer