Spectroscopic Investigation of the High-Pressure Behavior of Aliphatic Hydrocarbon: Implications for Planetary Processes
Abstract
Octadecane (C18H38) is an aliphatic hydrocarbon that is abundant in carbonaceous chondritic meteorites. It is debated whether these hydrocarbons found in the meteorite are pristine or are a result of subsequent modifications as these meteorites are delivered to the Earth. It is well-known that meteorites are often subjected to extreme pressures and temperatures upon entering the Earth’s atmosphere. To explore the behavior of octadecane at high pressures, that is, how its molecular structure responds to compression, we use a diamond anvil cell in conjunction with Raman spectroscopy. Here, we find that at room temperatures, upon compression to ~5 GPa, a linear-chain octadecane molecule transforms into a bent-chain configuration. Similar transitions from linear to a bent configuration in other hydrocarbons have been documented. We find a linear correlation between the transition pressure from linear to bent configuration, and the chain length of the alkane, that is, longer chain lengths, is likely to be less stable in the linear configuration under compression. These kinks in the bent-chain configuration are likely sites for the dissociation of the longer chain hydrocarbons to smaller hydrocarbons. The octadecane sample examined in this study did not undergo any additional transition to the highest pressure (~18 GPa) exploredmore »
- Authors:
-
[1];
[1];
[2];
- Florida State Univ., Tallahassee, FL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1766401
- Grant/Contract Number:
- AC05-00OR22725; EAR 1753125; EAR 1638752; EAR 1248553
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Earth and Space Chemistry
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 3; Journal ID: ISSN 2472-3452
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Octadecane; Carbonaceous Chondritic Meteorite; High-Pressures, Raman Spectroscopy; Diamond Anvil Cell
Citation Formats
Basu, Abhisek, Mookherjee, Mainak, Schiffert, Christina, Haberl, Bianca, and Boehler, Reinhard. Spectroscopic Investigation of the High-Pressure Behavior of Aliphatic Hydrocarbon: Implications for Planetary Processes. United States: N. p., 2021.
Web. doi:10.1021/acsearthspacechem.0c00259.
Basu, Abhisek, Mookherjee, Mainak, Schiffert, Christina, Haberl, Bianca, & Boehler, Reinhard. Spectroscopic Investigation of the High-Pressure Behavior of Aliphatic Hydrocarbon: Implications for Planetary Processes. United States. https://doi.org/10.1021/acsearthspacechem.0c00259
Basu, Abhisek, Mookherjee, Mainak, Schiffert, Christina, Haberl, Bianca, and Boehler, Reinhard. Wed .
"Spectroscopic Investigation of the High-Pressure Behavior of Aliphatic Hydrocarbon: Implications for Planetary Processes". United States. https://doi.org/10.1021/acsearthspacechem.0c00259. https://www.osti.gov/servlets/purl/1766401.
@article{osti_1766401,
title = {Spectroscopic Investigation of the High-Pressure Behavior of Aliphatic Hydrocarbon: Implications for Planetary Processes},
author = {Basu, Abhisek and Mookherjee, Mainak and Schiffert, Christina and Haberl, Bianca and Boehler, Reinhard},
abstractNote = {Octadecane (C18H38) is an aliphatic hydrocarbon that is abundant in carbonaceous chondritic meteorites. It is debated whether these hydrocarbons found in the meteorite are pristine or are a result of subsequent modifications as these meteorites are delivered to the Earth. It is well-known that meteorites are often subjected to extreme pressures and temperatures upon entering the Earth’s atmosphere. To explore the behavior of octadecane at high pressures, that is, how its molecular structure responds to compression, we use a diamond anvil cell in conjunction with Raman spectroscopy. Here, we find that at room temperatures, upon compression to ~5 GPa, a linear-chain octadecane molecule transforms into a bent-chain configuration. Similar transitions from linear to a bent configuration in other hydrocarbons have been documented. We find a linear correlation between the transition pressure from linear to bent configuration, and the chain length of the alkane, that is, longer chain lengths, is likely to be less stable in the linear configuration under compression. These kinks in the bent-chain configuration are likely sites for the dissociation of the longer chain hydrocarbons to smaller hydrocarbons. The octadecane sample examined in this study did not undergo any additional transition to the highest pressure (~18 GPa) explored in this study.},
doi = {10.1021/acsearthspacechem.0c00259},
journal = {ACS Earth and Space Chemistry},
number = 3,
volume = 5,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2021},
month = {Wed Feb 10 00:00:00 EST 2021}
}
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