return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C3H3NO (Isoxazole)

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-245.475973
Energy at 298.15K 
HF Energy-244.608663
Nuclear repulsion energy162.244098
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at MP2/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3350 3164 1.06 97.37 0.11 0.20
2 A' 3321 3136 1.00 40.53 0.59 0.74
3 A' 3309 3126 0.13 85.94 0.40 0.57
4 A' 1580 1492 5.63 5.86 0.10 0.18
5 A' 1455 1374 25.43 16.20 0.40 0.57
6 A' 1401 1323 2.84 3.37 0.09 0.16
7 A' 1238 1169 5.17 9.93 0.11 0.20
8 A' 1193 1127 13.77 4.14 0.58 0.74
9 A' 1145 1081 5.55 9.69 0.10 0.19
10 A' 1061 1002 5.81 4.53 0.69 0.82
11 A' 970 917 25.83 6.78 0.10 0.18
12 A' 922 871 3.26 3.71 0.73 0.85
13 A' 916 865 3.34 0.57 0.75 0.86
14 A" 899 849 5.07 1.15 0.75 0.86
15 A" 853 806 1.05 0.23 0.75 0.86
16 A" 796 752 52.13 0.86 0.75 0.86
17 A" 659 622 0.59 0.53 0.75 0.86
18 A" 621 587 10.45 0.69 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12843.6 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 12130.8 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at MP2/6-31G(2df,p)
ABC
0.32677 0.32318 0.16248

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.130 0.361 0.000
C2 0.624 -0.957 0.000
C3 0.000 1.124 0.000
N4 -0.702 -0.981 0.000
O5 -1.090 0.339 0.000
H6 2.153 0.694 0.000
H7 1.155 -1.896 0.000
H8 -0.193 2.184 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 N4 O5 H6 H7 H8
C11.41221.36322.27062.22031.07562.25742.2525
C21.41222.17281.32582.14932.25031.07893.2459
C31.36322.17282.21871.34342.19533.23361.0775
N42.27061.32582.21871.37603.30942.07053.2054
O52.22032.14931.34341.37603.26243.16862.0513
H61.07562.25032.19533.30943.26242.77532.7793
H72.25741.07893.23362.07053.16862.77534.2973
H82.25253.24591.07753.20542.05132.77934.2973

picture of Isoxazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 112.011 C1 C2 H7 129.481
C1 C3 O5 110.230 C1 C3 H8 134.361
C2 C1 C3 103.030 C2 C1 H6 129.012
C2 N4 O5 105.389 C3 C1 H6 127.958
C3 O5 N4 109.341 N4 C2 H7 118.509
O5 C3 H8 115.409
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability