Dimeric states of rhodamine B

López‐Arbeloa, Íñigo; Ojeda, Pilar Ruiz

doi:10.1016/0009-2614(82)83177-1

Cited by 166 publications

(104 citation statements)

References 18 publications

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“…Ghanadzadeh et al, [58] also studied the aggregation of RhB dye in the microporous solid hosts. Lopez Arbeloa and Ruiz Ojeda [59] determined the equilibrium constant for the dimer -momoner transition of RhB dye in aqueous solution. The greater aggregation of the zwitterionic form is due to the attractive electrostatic Table 4a-c, it was obvious that the value of R L was in the range of 0-1 for the adsorption process.…”

Section: Effect Of Ph On Dye Adsorptionmentioning

confidence: 99%

Scavenging Rhodamine B dye usingmoringa oleiferaseed pod

Bello

Lasisi

Adigun

et al. 2017

Chemical Speciation & Bioavailability

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Moringa oliferia seed pod was modified using orthophosphoric acid (H 3 PO 4 ) and used as adsorbent for sequestering Rhodamine B (Rh-B) dye from aqueous solution. The acid-modified adsorbent (MOSPAC) was characterized using Scanning Electron microscopy (SEM), Fourier Transform Infra Red (FTIR), Energy Dispersive X-ray (EDX), pH point of zero charge (pH pzc ) and Boehm Titration (BT) techniques, respectively. Operational parameters such as contact time, initial dye concentration, adsorbent dosage, pH and solution temperature were studied in batch process. Optimum dye adsorption was observed at pH 3.01. Equilibrium adsorption data was tested data using four different isotherm models: Langmuir, Freundlich, Temkin and DubininRadushkevich. Langmuir isotherm model fitted most with maximum monolayer adsorption capacity of 1250 mg g -1. Pseudo-second-order kinetic model provided the best correlation for the experimental data. Thermodynamic study showed that the process is endothermic, spontaneous and feasible. MOSPAC is an effective adsorbent for the removal of RhB dye from aqueous solutions.

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Section: Effect Of Ph On Dye Adsorptionmentioning

confidence: 99%

Scavenging Rhodamine B dye usingmoringa oleiferaseed pod

Bello

Lasisi

Adigun

et al. 2017

Chemical Speciation & Bioavailability

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“…3.2-3.3) [33][34][35] . Common XN dyes have a strong tendency to form dimers at high concentration, via π-π interaction due to their extended aromatic surface.…”

Section: Self-aggregation Of Xn Dyes In Watermentioning

confidence: 99%

pH-Responsive Switchable Aggregation Phenomena of Xanthene Dyes Adsorbed on Tungsten(VI) Oxide Colloid Surface

Adachi

Watanabe

Yamazaki

2014

Ind. Eng. Chem. Res.

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The surface interactions between xanthene (XN) dyes, including rhodamine B, rhodamine 3B, rhodamine 19, rhodamine 6G, rhodamine 110, and rhodamine 123, and tungsten(VI) oxide (WO 3 ) colloid particles were investigated. These XN dyes were strongly adsorbed as monolayer onto the WO 3 surface via the electrostatic interaction between their peripheral cationic amino-substituents and negatively surfacecharged WO 3 colloid particles, and most of ones adsorbed eventually formed the stable π-stacked dimers.The geometry of dimers formed on the WO 3 colloid surface is discussed on the molecular exciton theory framework. Cationic XN dyes formed the approximately ideal face-to-face H-dimers on the WO 3 colloid surface, whereas zwitterionic ones had a higher tendency to form the oblique J-dimers. Additionally, we have experimentally demonstrated the possibility of pH-induced switching between H-and J-aggregation modes of the XN dye's dimers formed on the WO 3 colloid surface. The findings lead to a better understanding of organic dye's adsorption/aggregation behaviors on the metal oxide surface.

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“…As described above, the spectroelectrochemical data apparently indicate that the transfer of SR101 − from the aqueous phase to the organic phase takes place at −0.18 V, and the adsorption processes of the anionic monomer are unfavorable in the aqueous phase at more negative potentials such as −0.32 V. As the cationic fluorescent species is not included in the organic phase, the results suggest the presence of additional interfacial processes such as the dimer formation, although no substantial spectroscopic changes in the absorption and emission spectra were observed in the bulk phases in the concentration range below 1×10 −4 mol dm −3 . Frequently, the xanthene dye forms a dimer in the solution [27][28][29]. In cases in which the monomer is preferentially adsorbed at the interface, the number density of monomers in the interfacial region is much higher than in the bulk solution, and the dimerization would occur more easily at the interface.…”

Section: Dynamic Spectroelectrochemical Analysismentioning

confidence: 99%

“…1). The dimer formation will be caused by a π-π interaction of xanthene moieties and an electrostatic interaction between the sulfo group and the positive charge [28,29]. The PMF response for the simple adsorption process in the aqueous phase (ΔF a ) can be expressed by the surface coverage (θ 0 ) and the adsorption (k a,0 ) and desorption rate constants (k d,0 ) [11],…”

Section: Dynamic Spectroelectrochemical Analysismentioning

confidence: 99%

Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

et al. 2006

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The transfer mechanism of an amphoteric rhodamine, sulforhodamine 101 (SR101), across the polarized water/1,2-dichloroethane (DCE) interface was investigated using cyclic voltammetry, differential voltfluorometry and potential-modulated fluorescence (PMF) spectroscopy. The voltammetric response for the ion transfer of SR101 monoanion from water to DCE was observed as the diffusion-controlled transfer process. An unusual voltammetric response was found at 0.15 V more negative than the formal transfer potential of

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Dimeric states of rhodamine B

Cited by 166 publications

References 18 publications

Scavenging Rhodamine B dye usingmoringa oleiferaseed pod

Scavenging Rhodamine B dye usingmoringa oleiferaseed pod

pH-Responsive Switchable Aggregation Phenomena of Xanthene Dyes Adsorbed on Tungsten(VI) Oxide Colloid Surface

Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

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