Table 6 The calculated thermodynamical properties of the PE molecule in the neutral and anion states, including thermal energy (E), specific heat capacity (Cv), entropy (S), and zero-point vibrational energy.

From: Spectroscopic, quantum chemical, and topological calculations of the phenylephrine molecule using density functional theory

Parameters

Thermal Energy

Specific Heat

Entropy

(Kcal/Mol)

(Cal/Mol-Kelvin)

Cal/Mol-Kelvin

Neutral State

Anion State

Neutral State

Anion State

Neutral

Anion

State

State

Electronic

0

0

0

0

0

1.38

Translational

0.89

0.89

2.98

2.98

41.25

41.25

Rotational

0.89

0.89

2.98

2.98

31.15

31.15

Vibrational

137.68

135.27

40.32

41.16

39.19

37.422

Total

139.46

137.05

46.29

47.12

111.58

111.19

Zero-point Vibrational Energy

131.69

129.25