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: QCISD(T)/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD(T)/Def2TZVPP
 hartrees
Energy at 0K-245.646662
Energy at 298.15K 
HF Energy-244.681604
Nuclear repulsion energy161.657890
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 QCISD(T)/Def2TZVPP
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' 3299 3299        
2 A' 3274 3274        
3 A' 3255 3255        
4 A' 1594 1594        
5 A' 1466 1466        
6 A' 1399 1399        
7 A' 1245 1245        
8 A' 1159 1159        
9 A' 1119 1119        
10 A' 1044 1044        
11 A' 932 932        
12 A' 909 909        
13 A' 879 879        
14 A" 899 899        
15 A" 867 867        
16 A" 783 783        
17 A" 635 635        
18 A" 598 598        

Unscaled Zero Point Vibrational Energy (zpe) 12679.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12679.6 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 QCISD(T)/Def2TZVPP
ABC
0.32581 0.31934 0.16127

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/Def2TZVPP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.130 0.370 0.000
C2 0.620 -0.962 0.000
C3 0.000 1.127 0.000
N4 -0.693 -0.995 0.000
O5 -1.097 0.346 0.000
H6 2.153 0.699 0.000
H7 1.160 -1.896 0.000
H8 -0.181 2.188 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 N4 O5 H6 H7 H8
C11.42651.35962.27722.22721.07532.26612.2415
C21.42652.17891.31322.15882.26101.07883.2509
C31.35962.17892.23211.34682.19543.23761.0771
N42.27721.31322.23211.40073.31252.06063.2245
O52.22722.15881.34681.40073.26993.18172.0579
H61.07532.26102.19543.31253.26992.77862.7689
H72.26611.07883.23762.06063.18172.77864.2989
H82.24153.25091.07713.22452.05792.76894.2989

picture of Isoxazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 112.379 C1 C2 H7 128.988
C1 C3 O5 110.759 C1 C3 H8 133.484
C2 C1 C3 102.872 C2 C1 H6 128.772
C2 N4 O5 105.346 C3 C1 H6 128.356
C3 O5 N4 108.645 N4 C2 H7 118.633
O5 C3 H8 115.757
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability