The temperature-dependent structure of alkylamines and their corresponding alkylammonium-alkylcarbamates

Nataly Belman; Jacob N. Israelachvili; Youli Li; Cyrus R. Safinya; Joel Bernstein; Yuval Golan

doi:10.1021/ja902944t

The temperature-dependent structure of alkylamines and their corresponding alkylammonium-alkylcarbamates

Nataly Belman, Jacob N. Israelachvili, Youli Li, Cyrus R. Safinya, Joel Bernstein, Yuval Golan

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

36 Scopus citations

Abstract

In spite of the wide use of alkylamine (AA) surfactants, little attention has been paid to their spontaneous reactivity in air. Exposure of AA surfactants to CO₂ results in the formation of alkylammonium-alkylcarbamate (AAAC) molecular pairs. The effect of hydrocarbon chain length on the reactivity of AAs was followed by monitoring mass gain vs time under atmospheric conditions as well as in a saturated CO₂ environment. The rates of conversion to AAAC decreased with hydrocarbon chain length. Indexed powder X-ray diffractograms and the corresponding unit cells are presented for all phases of AAs and AAACs with chain lengths of 14, 16, and 18 carbons. Temperature-resolved powder X-ray diffraction of AAACs indicated anisotropic thermal expansion occurring exclusively along the a direction of the unit cell.

Original language	English
Pages (from-to)	9107-9113
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	131
Issue number	25
DOIs	https://doi.org/10.1021/ja902944t
State	Published - 1 Jul 2009

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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abstract = "In spite of the wide use of alkylamine (AA) surfactants, little attention has been paid to their spontaneous reactivity in air. Exposure of AA surfactants to CO2 results in the formation of alkylammonium-alkylcarbamate (AAAC) molecular pairs. The effect of hydrocarbon chain length on the reactivity of AAs was followed by monitoring mass gain vs time under atmospheric conditions as well as in a saturated CO2 environment. The rates of conversion to AAAC decreased with hydrocarbon chain length. Indexed powder X-ray diffractograms and the corresponding unit cells are presented for all phases of AAs and AAACs with chain lengths of 14, 16, and 18 carbons. Temperature-resolved powder X-ray diffraction of AAACs indicated anisotropic thermal expansion occurring exclusively along the a direction of the unit cell.",

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T1 - The temperature-dependent structure of alkylamines and their corresponding alkylammonium-alkylcarbamates

AU - Belman, Nataly

AU - Israelachvili, Jacob N.

AU - Li, Youli

AU - Safinya, Cyrus R.

AU - Bernstein, Joel

AU - Golan, Yuval

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AB - In spite of the wide use of alkylamine (AA) surfactants, little attention has been paid to their spontaneous reactivity in air. Exposure of AA surfactants to CO2 results in the formation of alkylammonium-alkylcarbamate (AAAC) molecular pairs. The effect of hydrocarbon chain length on the reactivity of AAs was followed by monitoring mass gain vs time under atmospheric conditions as well as in a saturated CO2 environment. The rates of conversion to AAAC decreased with hydrocarbon chain length. Indexed powder X-ray diffractograms and the corresponding unit cells are presented for all phases of AAs and AAACs with chain lengths of 14, 16, and 18 carbons. Temperature-resolved powder X-ray diffraction of AAACs indicated anisotropic thermal expansion occurring exclusively along the a direction of the unit cell.

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The temperature-dependent structure of alkylamines and their corresponding alkylammonium-alkylcarbamates

Abstract

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