Investigation on solvation and protonation of meso-tetrakis(p-sulfonatophenyl)porphyrin in imidazolium-based ionic liquids by spectroscopic methods

Li, Hui; Jin, Wei; Xi, Lei; Dong, Zhong

doi:10.1016/j.saa.2009.06.057

Cited by 10 publications

(7 citation statements)

References 48 publications

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“…While the J-aggregate has characteristic absorption peaks at ca. 490 and 705 nm in aqueous solution, 483 and 702 nm in imidazolium-based IL [20]. So, the UV-vis absorption technique is a simple and convenient tool for verifying the existence of J-aggregates.…”

Section: Absorption Spectra Of Tpps In the Presence Of Ilsmentioning

confidence: 99%

“…in ILs based on steady-state and the picosecond time-resolved fluorimetry [1][2][3][4][5][6][7][8][9]. Because of the importance of water-soluble porphyrins and metalloporphyrins in bioscience [10][11][12][13][14], material science [15][16][17], etc., the J-aggregation of meso-tetrakis-(4-sulfonatophenyl)porphyrin (TPPS) is studied in pyridium [18,19] or imidazolium-based [20] ionic liquid solutions and we have previously found that TPPS could form efficiently J-aggregates in pure acidic ILs 1-butylimidazolium tetrafluoroborate (HBIMBF 4 ), but could not form J-aggregates in pure acidic 1-butylimidazolium p-toluenesulfonate (HBIMTS) [20]. Two kinds of ILs possess the same cation but different anions.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic investigation on the effect of pairing anions in imidazolium-based ionic liquids on the J-aggregation of meso-tetrakis-(4-sulfonatophenyl)porphyrin in aqueous solution

Liu

Weijun

et al. 2011

Journal of Luminescence

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Section: Absorption Spectra Of Tpps In the Presence Of Ilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigation on the effect of pairing anions in imidazolium-based ionic liquids on the J-aggregation of meso-tetrakis-(4-sulfonatophenyl)porphyrin in aqueous solution

Liu

Weijun

et al. 2011

Journal of Luminescence

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“…The peaks at 449 and 469 nm ascribe to the Soret bands of H 4 TPPS 2and J-aggregates, respectively, while the peak at 679 nm ascribes to the co-effect of the Q-bands of H 4 TPPS 2and J-aggregates. It has been reported in the literatures earlier [35,39,40] that in ILs-rich environment the Soret bands of H 4 TPPS 2and J-aggregates tend to shift to 448 and 479 ~ 482 nm, respectively. It is in agreement with the result in this paper and confirms the speculation above.…”

Section: Absorbance Of Tpps In Acidic Bmimbf 4 and Emimbf 4 In The Prmentioning

confidence: 79%

“…The J-aggregation of TPPS is promoted by the imidazolium-based ionic liquids with BF 4 as the anion through charge equilibrium. However, the ionic liquids with TSas the anion inhibit the J-aggregation of TPPS by hydrophobic and π-π interactions [40,41].…”

Section: Investigation On the Effect Of Water On The Spectroscopic Bementioning

confidence: 99%

Investigation on the effect of water on the spectroscopic behaviors of TPPS in acidic imidazolium-based ionic liquids

Liu

Zhao

Jin

2012

J. Porphyrins Phthalocyanines

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The effect of water on the spectroscopic behaviors of meso-tetrakis-(4-sulfonatophenyl) porphyrin (TPPS) in acidic 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF 4 ) and 1-ethyl-3methylimidazolium tetrafluoroborate (EMIMBF 4 ) is investigated by spectroscopic methods. In acidic ionic liquids without water, the Soret bands of the protonated form (H 4 TPPS 2-) and J-aggregates of TPPS are centered at 449 and 469 nm, respectively, and the Q-band is centered at 679 nm. When increasing the content of water, the Soret band of H 4 TPPS 2is blue-shifted to 430 nm. However, the Soret and Q-bands of J-aggregates are red-shifted to 487 and 701 nm, respectively. The NMR and pyrene-scale polarity experiments reveal that the change of the bulk environment is responsible for the red-shift of J-aggregates and the blue-shift of H 4 TPPS 2-. According to the analysis of the fluorescence spectra, the content of H 4 TPPS 2increases gradually with the addition of water, while the content of H 2 TPPS 4takes the opposite trend. Simultaneously, the content of J-aggregates decreases substantially when the addition of water is 0 ~ ca. 12 mL (or 13 mL) but it decreases slowly with further addition of water. Remarkably, the fluorescence intensity of J-aggregates is relatively strong. In addition, the fluorescence of J-aggregates can be detected when λ ex is set at both λ ex for TPPS monomers and λ ex for J-aggregates. While the fluorescence of TPPS monomers can be detected only when λ ex is set at λ ex for monomers. Moreover, with the addition of water, the fluorescence lifetimes of H 2 TPPS 4and H 4 TPPS 2increase from 3.202 and 0.830 ns to 9.623 and 2.964 ns, respectively.

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“…Some of the best-studied ionic liquids are those bearing imidazolium cations. [7][8][9][10][11] A number of studies have revealed that the structure of imidazolium-based ionic liquids is characterized by short-and long-range ordering that exists in both the solid and more remarkably, liquid states. 2, 3 Perhaps more importantly, the thermodynamic properties and functions of ionic liquids can be controlled by judicious selection of the anion and cation components.…”

Section: Solvation and Microscopic Properties Of Ionic Liquid/acetonimentioning

confidence: 99%

Solvation and microscopic properties of ionic liquid/acetonitrile mixtures probed by high-pressure infrared spectroscopy

Umebayashi

Jiang

Lin

et al. 2009

The Journal of Chemical Physics

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The microscopic features of binary mixtures formed by an ionic liquid (EMI(+)TFSA(-) or EMI(+)FSA(-)) and a molecular liquid (acetonitrile or methanol) have been investigated by high-pressure infrared spectroscopy. On the basis of its responses to changes in pressure and concentration, the imidazolium C-H appears to exist at least in two different forms, i.e., isolated and associated structures. The weak band at approximately 3102 cm(-1) should be assigned to the isolated structure. CD(3)CN can be added to change the structural organization of ionic liquids. The compression of an EMI(+)TFSA(-)/CD(3)CN mixture leads to the increase in the isolated C-H band intensity. Nevertheless, the loss in intensity of the isolated structures was observed for EMI(+)FSA(-)/CD(3)CN mixtures as the pressure was elevated. In other words, the associated configuration is favored with increasing pressure by debiting the isolated form for EMI(+)FSA(-)/CD(3)CN mixtures. The stronger C-H...F interactions in EMI(+)FSA(-) may be one of the reasons for the remarkable differences in the pressure-dependent results of EMI(+)TFSA(-) and EMI(+)FSA(-).

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Investigation on solvation and protonation of meso-tetrakis(p-sulfonatophenyl)porphyrin in imidazolium-based ionic liquids by spectroscopic methods

Cited by 10 publications

References 48 publications

Spectroscopic investigation on the effect of pairing anions in imidazolium-based ionic liquids on the J-aggregation of meso-tetrakis-(4-sulfonatophenyl)porphyrin in aqueous solution

Spectroscopic investigation on the effect of pairing anions in imidazolium-based ionic liquids on the J-aggregation of meso-tetrakis-(4-sulfonatophenyl)porphyrin in aqueous solution

Investigation on the effect of water on the spectroscopic behaviors of TPPS in acidic imidazolium-based ionic liquids

Solvation and microscopic properties of ionic liquid/acetonitrile mixtures probed by high-pressure infrared spectroscopy

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