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 C4H5NO (Isoxazole, 5-methyl-)

using model chemistry: MP2/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/6-311G**
 hartrees
Energy at 0K-284.631242
Energy at 298.15K-284.637632
HF Energy-283.696261
Nuclear repulsion energy223.745118
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 MP2/6-311G**
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 3316 3151 0.15      
2 A 3284 3121 1.62      
3 A 3192 3033 6.95      
4 A 3167 3010 7.11      
5 A 3087 2933 12.95      
6 A 1647 1565 23.79      
7 A 1514 1439 10.02      
8 A 1494 1420 8.62      
9 A 1487 1413 19.59      
10 A 1429 1358 2.00      
11 A 1375 1306 10.29      
12 A 1296 1231 13.28      
13 A 1210 1150 8.29      
14 A 1074 1020 1.04      
15 A 1067 1014 2.68      
16 A 1043 991 15.93      
17 A 1014 964 1.64      
18 A 963 915 10.68      
19 A 932 886 9.45      
20 A 860 817 4.09      
21 A 816 775 41.05      
22 A 665 632 0.53      
23 A 640 608 1.29      
24 A 632 600 0.44      
25 A 331 315 1.79      
26 A 243 231 2.37      
27 A 92 87 0.66      

Unscaled Zero Point Vibrational Energy (zpe) 18933.7 cm-1
Scaled (by 0.9502) Zero Point Vibrational Energy (zpe) 17990.8 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 MP2/6-311G**
ABC
0.30688 0.11896 0.08713

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G**

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.107 0.015 0.000
H2 -2.458 -0.520 0.886
H3 -2.541 1.016 -0.000
H4 -2.458 -0.521 -0.886
C5 -0.621 0.115 -0.000
O6 0.065 -1.050 -0.000
N7 1.421 -0.799 0.000
C8 1.533 0.521 -0.000
H9 2.524 0.954 0.000
C10 0.266 1.158 0.000
H11 0.040 2.212 -0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.09341.09151.09341.48912.41903.62003.67424.72432.63323.0714
H21.09341.77601.77192.13612.72613.98824.21835.27003.31953.8066
H31.09151.77601.77612.12193.32654.35834.10415.06532.81102.8449
H41.09341.77191.77612.13612.72573.98804.21835.27013.31983.8070
C51.48912.13612.12192.13611.35192.23662.19153.25451.36912.1992
O62.41902.72613.32652.72571.35191.37872.15033.17212.21713.2626
N73.62003.98824.35833.98802.23661.37871.32512.07142.27203.3127
C83.67424.21834.10414.21832.19152.15031.32511.08141.41752.2555
H94.72435.27005.06535.27013.25453.17212.07141.08142.26662.7839
C102.63323.31952.81103.31981.36912.21712.27201.41752.26661.0785
H113.07143.80662.84493.80702.19923.26263.31272.25552.78391.0785

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 116.667 C1 C5 C10 134.192
H2 C1 H3 108.756 H2 C1 H4 108.247
H2 C1 C5 110.685 H3 C1 H4 108.758
H3 C1 C5 109.660 H4 C1 C5 110.681
C5 O6 N7 109.986 C5 C10 C8 103.698
C5 C10 H11 127.531 O6 C5 C10 109.141
O6 N7 C8 105.348 N7 C8 H9 118.451
N7 C8 C10 111.827 C8 C10 H11 128.771
H9 C8 C10 129.722
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability