Aggregate formation of Rhodamine 6G in anisotropic solvents

Gilani, A. Ghanadzadeh; Sariri, Reyhaneh; Bahrpaima, Khatereh

doi:10.1016/s1386-1425(00)00344-9

Cited by 16 publications

(3 citation statements)

References 11 publications

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“…Information about the dyes is given in Table 1. Spectral characteristics of dyes are given according to the works [13][14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…When the concentration increases from 10 -6 to 10 -3 mol/L, there is a deviation of the optical density from the basic law of light absorption, which is explained by the combination of molecules (or cations) in the dimer [13][14][15][16][17][18][19]. Additions of salts (KCl, LiCl and others) also enhance self-association, which leads to "blurring" of isosbestic points in the spectral series [20].…”

Section: Experimental Conditions and Equipmentmentioning

confidence: 99%

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Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

S.A

2021

Bull. Sci. Res.

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The ability of rhodamine cations to form cation-anionic associates with tetraphenylborate-anion in an aqueous solution has been studied. The thermodynamic values of the equilibrium association constants Kasт were determined spectrophotometrically. The values of a number of properties of dye molecules (surface area, effective volume, hydrophobicity index log P, standard enthalpy of hydration ΔНohydr) were calculated using the QSAR model. The possibility of dependence of the value of Kasт on these factors has been reviewed. It was shown that changes in lg Kasт in the series of rhodamine associates are consistent with changes in the parameters log P and ΔНohydr.

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“…Information about the dyes is given in Table 1. Spectral characteristics of dyes are given according to the works [13][14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

Section: Experimental Conditions and Equipmentmentioning

confidence: 99%

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

S.A

2021

Bull. Sci. Res.

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“…The formation of aggregates leads to spectral shifts that can be used to quantify their equilibrium constant. In several cases the spectral responses of the monomers and of the aggregates overlap considerably, making the calculation of the equilibrium constant more difficult [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Ionochromism, solvatochromism and effect of dissolved gases on the spectral properties of bromothymol blue

Tatini

Anselmi²,

Cabrucci³

et al. 2022

Journal of Molecular Liquids

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Ratiometric Fluorescent Nanosensors for Copper(II) Based on Bis(rhodamine)‐Derived PMOs with J‐Type Aggregates

Qiu

Han

et al. 2015

Chemistry A European J

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By using pentyl-linked bis(rhodamine)-derived tetra-siloxane (PRh-Si4 ) as the organosilica precursor, highly ordered PRh-bridged periodic mesoporous organosilicas (PRhPMOs) were prepared. When excited at λ=500 nm, the PRhPMO suspension that contained metal ions showed two separate emission peaks at λ=550 and 623 nm. The first peak, located at λ=550 nm, was due to ring-opening of the spiro structure in the rhodamine moiety and the second, located at λ=623 nm, originated from fluorescent aggregates of the PRh units embedded in the silica framework of the PRhPMO. By using the different intensity ratios of the two fluorescence signals (FI550/623), PRhPMOs could be used as turn-ON type fluorescent ratiometric chemosensors for Cu(2+). Furthermore, based on the single-exciton theory, it was deduced that the fluorescent aggregates formed were of the J-type and had a coplanar configuration. Consequently, PRhPMOs display a longer fluorescence lifetime and greater fluorescent quantum yield than the respective monomers dissolved in solution, which is consistent with the experimental results.

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Aggregate formation of Rhodamine 6G in anisotropic solvents

Cited by 16 publications

References 11 publications

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

Ionochromism, solvatochromism and effect of dissolved gases on the spectral properties of bromothymol blue

Ratiometric Fluorescent Nanosensors for Copper(II) Based on Bis(rhodamine)‐Derived PMOs with J‐Type Aggregates

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