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Aminomethanol water elimination: theoretical examination
Michael T Feldmann1, Susanna L Widicus, Geoffrey A Blake
1Center for Advanced Computing Research, MC 158-79, California Institute of Technology, Pasadena, 91125, USA.
The Journal of Chemical Physics
|August 6, 2005
Summary
Aminomethanol, a precursor to interstellar glycine, is stable under typical lab conditions. Its water loss barrier is 55 kcal/mol, suggesting straightforward spectroscopic study and searches for this molecule.
Area of Science:
- Astrochemistry
- Theoretical Chemistry
Background:
- Hexamethylenetetraamine formation involves ammonia and formaldehyde.
- Aminomethanol is a predicted precursor to interstellar glycine, crucial for astrobiological studies.
- Laboratory spectroscopic study of aminomethanol is needed for observational searches.
Purpose of the Study:
- To determine the water loss barrier height for aminomethanol decomposition.
- To calculate the unimolecular decomposition rate of aminomethanol.
- To assess the feasibility of laboratory spectroscopic characterization and astronomical observation of aminomethanol.
Main Methods:
- Computational chemistry methods were used to calculate reaction barriers.
- The Rice-Ramsperger-Kassel-Marcus (RRKM) theory was applied to determine decomposition rates.
Main Results:
- The water loss barrier for aminomethanol was determined to be 55 kcal/mol at ambient temperatures.
- The infinite-pressure unimolecular decomposition rate was calculated to be less than 10^-25 s^-1 at 300 K.
- Aminomethanol exhibits gas-phase kinetic stability at typical laboratory and interstellar 'hot core' temperatures.
Conclusions:
- Aminomethanol is kinetically stable, supporting its potential existence in interstellar environments.
- Spectroscopic characterization and observational searches for aminomethanol are feasible.
- Further research into efficient formation mechanisms for aminomethanol is recommended.