Abstract
We report the negative ion photoelectron spectroscopy of the hydroxymethoxide anion, H2C(OH)O−. The photoelectron spectra show that 3.49 eV photodetachment produces two distinct electronic states of the neutral hydroxymethoxy radical (H2C(OH)O⋅). The H2C(OH)O⋅ ground state (𝑋̃
2A) photoelectron spectrum exhibits a vibrational progression consisting primarily of the OCO symmetric and asymmetric stretches, the OCO bend, as well as combination bands involving these modes with other, lower frequency modes. A high-resolution photoelectron spectrum aids in the assignment of several vibrational frequencies of the neutral H2C(OH)O⋅ radical, including an experimental determination of the H2C(OH)O⋅ 2ν12 overtone of the H–OCO torsional vibration as 220(10) cm−1. The electron affinity of H2C(OH)O⋅ is determined to be 2.220(2) eV. The low-lying 𝐴̃
2A excited state is also observed, with a spectrum that peaks ∼0.8 eV above the 𝑋̃
2A state origin. The 𝐴̃
2A state photoelectron spectrum is a broad, partially resolved band. Quantum chemical calculations and photoelectron simulations aid in the interpretation of the photoelectron spectra. In addition, the gas phase acidity of methanediol is calculated to be 366(2) kcal mol−1, which results in an OH bond dissociation energy, D0(H2C(OH)O–H), of 104(2) kcal mol−1, using the experimentally determined electron affinity of the hydroxymethoxy radical.
2A) photoelectron spectrum exhibits a vibrational progression consisting primarily of the OCO symmetric and asymmetric stretches, the OCO bend, as well as combination bands involving these modes with other, lower frequency modes. A high-resolution photoelectron spectrum aids in the assignment of several vibrational frequencies of the neutral H2C(OH)O⋅ radical, including an experimental determination of the H2C(OH)O⋅ 2ν12 overtone of the H–OCO torsional vibration as 220(10) cm−1. The electron affinity of H2C(OH)O⋅ is determined to be 2.220(2) eV. The low-lying 𝐴̃
2A excited state is also observed, with a spectrum that peaks ∼0.8 eV above the 𝑋̃
2A state origin. The 𝐴̃
2A state photoelectron spectrum is a broad, partially resolved band. Quantum chemical calculations and photoelectron simulations aid in the interpretation of the photoelectron spectra. In addition, the gas phase acidity of methanediol is calculated to be 366(2) kcal mol−1, which results in an OH bond dissociation energy, D0(H2C(OH)O–H), of 104(2) kcal mol−1, using the experimentally determined electron affinity of the hydroxymethoxy radical.
| Original language | English |
|---|---|
| Journal | The Journal of Chemical Physics |
| Volume | 145 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Sept 2016 |