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All results from a given calculation for C4H5NO (Isoxazole, 5-methyl-)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-50.984281
Energy at 298.15K-50.990612
HF Energy-50.167072
Nuclear repulsion energy115.644720
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/CEP-31G*
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 3304 3137 0.01      
2 A 3276 3110 2.59      
3 A 3212 3049 12.38      
4 A 3193 3032 11.82      
5 A 3099 2942 19.03      
6 A 1658 1574 24.69      
7 A 1516 1440 11.65      
8 A 1499 1423 9.84      
9 A 1492 1417 18.18      
10 A 1445 1372 2.54      
11 A 1364 1295 11.83      
12 A 1295 1229 14.97      
13 A 1200 1139 10.85      
14 A 1078 1023 2.41      
15 A 1066 1012 3.95      
16 A 1038 986 14.09      
17 A 994 944 1.60      
18 A 945 897 16.18      
19 A 908 862 7.48      
20 A 867 823 1.62      
21 A 834 792 66.05      
22 A 650 617 0.57      
23 A 633 601 1.50      
24 A 618 587 0.00      
25 A 320 304 2.12      
26 A 245 233 3.40      
27 A 104 99 0.77      

Unscaled Zero Point Vibrational Energy (zpe) 18926.2 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 17968.6 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/CEP-31G*
ABC
0.29797 0.11554 0.08461

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.102 0.034 0.000
H2 -2.458 -0.504 0.895
H3 -2.526 1.051 -0.000
H4 -2.458 -0.504 -0.895
C5 -0.595 0.122 -0.000
O6 0.083 -1.068 -0.000
N7 1.470 -0.830 0.000
C8 1.596 0.508 -0.000
H9 2.604 0.926 0.000
C10 0.321 1.173 0.000
H11 0.105 2.240 -0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.10351.10171.10351.51012.44773.67523.72834.78952.67703.1206
H21.10351.79571.79032.16022.75314.04214.27335.33553.36663.8603
H31.10171.79571.79572.14323.36144.41664.15765.13112.84922.8873
H41.10351.79031.79572.16012.75284.04204.27335.33553.36683.8605
C51.51012.16022.14322.16011.36952.27362.22433.29771.39342.2307
O62.44772.75313.36142.75281.36951.40692.18403.21352.25303.3081
N73.67524.04214.41664.04202.27361.40691.34342.08982.30903.3597
C83.72834.27334.15764.27332.22432.18401.34341.09101.43832.2856
H94.78955.33555.13115.33553.29773.21352.08981.09102.29632.8231
C102.67703.36662.84923.36681.39342.25302.30901.43832.29631.0890
H113.12063.86032.88733.86052.23073.30813.35972.28562.82311.0890

picture of Isoxazole, 5-methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C5 O6 116.339 C1 C5 C10 134.397
H2 C1 H3 109.034 H2 C1 H4 108.422
H2 C1 C5 110.515 H3 C1 H4 109.035
H3 C1 C5 109.289 H4 C1 C5 110.511
C5 O6 N7 109.937 C5 C10 C8 103.521
C5 C10 H11 127.525 O6 C5 C10 109.264
O6 N7 C8 105.116 N7 C8 H9 117.918
N7 C8 C10 112.162 C8 C10 H11 128.954
H9 C8 C10 129.920
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability