Interfacial solvation within n-alkane monolayers in contact with supercritical CO 2

Michael J. Dabney; Frank V. Bright

doi:10.1021/jp3062515

Interfacial solvation within n-alkane monolayers in contact with supercritical CO ₂

Michael J. Dabney
, Frank V. Bright

Chemistry

SUNY Buffalo

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

2 Scopus citations

Abstract

We report on the rotational reorientation dynamics of a fluorescent reporter molecule, BODIPY 494/503, within n-alkyl (n = 1-18) monolayers formed on quartz in contact with pure supercritical carbon dioxide (scCO ₂) at 313 K (reduced temperature, T _r = 1.03) between a reduced CO ₂ density (ρ _r = ρ _exp/ρ _c) of 0 and 1.8. The BODIPY 494/504 rotational dynamics are described by free (n ≥ 4) and hindered rotor (n ≤ 6) models. As the CO ₂ density increases, hindered rotation shifts toward free rotation, and the local viscosity in the cybotactic region surrounding the BODIPY 494/504 reporter within the monolayer decreases. These results are interpreted in terms of n- and density-dependent scCO ₂ alkyl chain solvation.

Original language	English
Pages (from-to)	18340-18346
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	34
DOIs	https://doi.org/10.1021/jp3062515
State	Published - Aug 30 2012

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title = "Interfacial solvation within n-alkane monolayers in contact with supercritical CO 2 ",

abstract = "We report on the rotational reorientation dynamics of a fluorescent reporter molecule, BODIPY 494/503, within n-alkyl (n = 1-18) monolayers formed on quartz in contact with pure supercritical carbon dioxide (scCO 2) at 313 K (reduced temperature, T r = 1.03) between a reduced CO 2 density (ρ r = ρ exp/ρ c) of 0 and 1.8. The BODIPY 494/504 rotational dynamics are described by free (n ≥ 4) and hindered rotor (n ≤ 6) models. As the CO 2 density increases, hindered rotation shifts toward free rotation, and the local viscosity in the cybotactic region surrounding the BODIPY 494/504 reporter within the monolayer decreases. These results are interpreted in terms of n- and density-dependent scCO 2 alkyl chain solvation.",

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AU - Dabney, Michael J.

AU - Bright, Frank V.

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N2 - We report on the rotational reorientation dynamics of a fluorescent reporter molecule, BODIPY 494/503, within n-alkyl (n = 1-18) monolayers formed on quartz in contact with pure supercritical carbon dioxide (scCO 2) at 313 K (reduced temperature, T r = 1.03) between a reduced CO 2 density (ρ r = ρ exp/ρ c) of 0 and 1.8. The BODIPY 494/504 rotational dynamics are described by free (n ≥ 4) and hindered rotor (n ≤ 6) models. As the CO 2 density increases, hindered rotation shifts toward free rotation, and the local viscosity in the cybotactic region surrounding the BODIPY 494/504 reporter within the monolayer decreases. These results are interpreted in terms of n- and density-dependent scCO 2 alkyl chain solvation.

AB - We report on the rotational reorientation dynamics of a fluorescent reporter molecule, BODIPY 494/503, within n-alkyl (n = 1-18) monolayers formed on quartz in contact with pure supercritical carbon dioxide (scCO 2) at 313 K (reduced temperature, T r = 1.03) between a reduced CO 2 density (ρ r = ρ exp/ρ c) of 0 and 1.8. The BODIPY 494/504 rotational dynamics are described by free (n ≥ 4) and hindered rotor (n ≤ 6) models. As the CO 2 density increases, hindered rotation shifts toward free rotation, and the local viscosity in the cybotactic region surrounding the BODIPY 494/504 reporter within the monolayer decreases. These results are interpreted in terms of n- and density-dependent scCO 2 alkyl chain solvation.

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DO - 10.1021/jp3062515

M3 - Article

AN - SCOPUS:84865704771

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SP - 18340

EP - 18346

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 34

ER -

Interfacial solvation within n-alkane monolayers in contact with supercritical CO ₂

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