Micro-Raman study on the conformation behavior of succinate in supersaturated sodium succinate aerosols

Feng Wang; Yun Hong Zhang; Li Jun Zhao; Hao Zhang; Hua Cheng; Jing Jing Shou

doi:10.1039/b719457a

Micro-Raman study on the conformation behavior of succinate in supersaturated sodium succinate aerosols

Feng Wang, Yun Hong Zhang^*, Li Jun Zhao, Hao Zhang, Hua Cheng, Jing Jing Shou

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Micro-Raman spectra of supersaturated aerosols of sodium succinate were obtained. The conformation behavior of the succinate dianion as a function of relative humidity (RH) was investigated by combining micro-Raman spectroscopy with theoretical calculations. A shoulder at 968 cm^-1 of the v(C-CO₂^-) band on the rise in more concentrated droplets was believed indicative of conformation transformations. The intensity ratio (I₉₆₃/I₉₉₇) of the v(C-CO₂^-) band at 963 cm^-1 to the v(C-C) band at 997 cm^-1, versus the molar water-to-solute ratio (WSR), was used to fathom the equilibrium between gauche and trans conformations. Before saturation (WSR = 25.8) for the droplets, the ratio of I₉₆₃/I₉₉₇ retains a value of ∼2.6 independent of WSR, indicating that the equilibrium was not disturbed in the dilute droplets. In supersaturated droplets (WSR < 25.8), however, the ratio sharply decreases from ∼2.6 to ∼1.1 at WSR = 9.6, which was attributed to the formation of contact ion pairs (CIPs).

Original language	English
Pages (from-to)	4154-4158
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	10
Issue number	28
DOIs	https://doi.org/10.1039/b719457a
Publication status	Published - 2008

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title = "Micro-Raman study on the conformation behavior of succinate in supersaturated sodium succinate aerosols",

abstract = "Micro-Raman spectra of supersaturated aerosols of sodium succinate were obtained. The conformation behavior of the succinate dianion as a function of relative humidity (RH) was investigated by combining micro-Raman spectroscopy with theoretical calculations. A shoulder at 968 cm-1 of the v(C-CO2-) band on the rise in more concentrated droplets was believed indicative of conformation transformations. The intensity ratio (I963/I997) of the v(C-CO2-) band at 963 cm-1 to the v(C-C) band at 997 cm-1, versus the molar water-to-solute ratio (WSR), was used to fathom the equilibrium between gauche and trans conformations. Before saturation (WSR = 25.8) for the droplets, the ratio of I963/I997 retains a value of ∼2.6 independent of WSR, indicating that the equilibrium was not disturbed in the dilute droplets. In supersaturated droplets (WSR < 25.8), however, the ratio sharply decreases from ∼2.6 to ∼1.1 at WSR = 9.6, which was attributed to the formation of contact ion pairs (CIPs).",

author = "Feng Wang and Zhang, {Yun Hong} and Zhao, {Li Jun} and Hao Zhang and Hua Cheng and Shou, {Jing Jing}",

year = "2008",

doi = "10.1039/b719457a",

language = "English",

volume = "10",

pages = "4154--4158",

journal = "Physical Chemistry Chemical Physics",

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publisher = "Royal Society of Chemistry",

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T1 - Micro-Raman study on the conformation behavior of succinate in supersaturated sodium succinate aerosols

AU - Wang, Feng

AU - Zhang, Yun Hong

AU - Zhao, Li Jun

AU - Zhang, Hao

AU - Cheng, Hua

AU - Shou, Jing Jing

PY - 2008

Y1 - 2008

N2 - Micro-Raman spectra of supersaturated aerosols of sodium succinate were obtained. The conformation behavior of the succinate dianion as a function of relative humidity (RH) was investigated by combining micro-Raman spectroscopy with theoretical calculations. A shoulder at 968 cm-1 of the v(C-CO2-) band on the rise in more concentrated droplets was believed indicative of conformation transformations. The intensity ratio (I963/I997) of the v(C-CO2-) band at 963 cm-1 to the v(C-C) band at 997 cm-1, versus the molar water-to-solute ratio (WSR), was used to fathom the equilibrium between gauche and trans conformations. Before saturation (WSR = 25.8) for the droplets, the ratio of I963/I997 retains a value of ∼2.6 independent of WSR, indicating that the equilibrium was not disturbed in the dilute droplets. In supersaturated droplets (WSR < 25.8), however, the ratio sharply decreases from ∼2.6 to ∼1.1 at WSR = 9.6, which was attributed to the formation of contact ion pairs (CIPs).

AB - Micro-Raman spectra of supersaturated aerosols of sodium succinate were obtained. The conformation behavior of the succinate dianion as a function of relative humidity (RH) was investigated by combining micro-Raman spectroscopy with theoretical calculations. A shoulder at 968 cm-1 of the v(C-CO2-) band on the rise in more concentrated droplets was believed indicative of conformation transformations. The intensity ratio (I963/I997) of the v(C-CO2-) band at 963 cm-1 to the v(C-C) band at 997 cm-1, versus the molar water-to-solute ratio (WSR), was used to fathom the equilibrium between gauche and trans conformations. Before saturation (WSR = 25.8) for the droplets, the ratio of I963/I997 retains a value of ∼2.6 independent of WSR, indicating that the equilibrium was not disturbed in the dilute droplets. In supersaturated droplets (WSR < 25.8), however, the ratio sharply decreases from ∼2.6 to ∼1.1 at WSR = 9.6, which was attributed to the formation of contact ion pairs (CIPs).

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U2 - 10.1039/b719457a

DO - 10.1039/b719457a

M3 - Article

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AN - SCOPUS:46749137937

SN - 1463-9076

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SP - 4154

EP - 4158

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 28

ER -

Micro-Raman study on the conformation behavior of succinate in supersaturated sodium succinate aerosols

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