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: B3LYP/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3LYP/3-21G*
 hartrees
Energy at 0K-244.669081
Energy at 298.15K 
HF Energy-244.669081
Nuclear repulsion energy158.629956
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 B3LYP/3-21G*
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' 3325 3198 0.53 97.98 0.10 0.18
2 A' 3296 3171 0.38 59.51 0.63 0.78
3 A' 3272 3148 1.09 76.58 0.39 0.56
4 A' 1563 1504 9.40 4.23 0.12 0.22
5 A' 1405 1352 26.91 20.04 0.50 0.66
6 A' 1376 1324 1.78 8.63 0.22 0.36
7 A' 1229 1182 6.52 8.61 0.28 0.44
8 A' 1152 1109 15.11 9.12 0.60 0.75
9 A' 1074 1033 2.61 6.86 0.13 0.24
10 A' 1026 987 15.04 2.69 0.57 0.73
11 A' 945 909 3.81 5.26 0.62 0.77
12 A' 900 866 1.06 1.55 0.47 0.64
13 A' 794 764 14.74 7.46 0.16 0.27
14 A" 948 912 1.56 1.79 0.75 0.86
15 A" 905 871 4.11 1.63 0.75 0.86
16 A" 805 774 72.70 1.41 0.75 0.86
17 A" 638 614 11.31 0.13 0.75 0.86
18 A" 583 561 7.19 1.79 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12618.6 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 12139.1 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 B3LYP/3-21G*
ABC
0.31718 0.30413 0.15526

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.125 0.387 0.000
C2 0.642 -0.960 0.000
C3 0.000 1.151 0.000
N4 -0.680 -1.057 0.000
O5 -1.132 0.359 0.000
H6 2.149 0.713 0.000
H7 1.229 -1.865 0.000
H8 -0.163 2.215 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 N4 O5 H6 H7 H8
C11.43131.35982.31132.25751.07452.25432.2360
C21.43132.20671.32532.21112.25181.07833.2756
C31.35982.20672.31021.38182.19303.25661.0762
N42.31131.32532.31021.48653.33682.07263.3122
O52.25752.21111.38181.48653.30023.24362.0935
H61.07452.25182.19303.33683.30022.73712.7570
H72.25431.07833.25662.07263.24362.73714.3106
H82.23603.27561.07623.31222.09352.75704.3106

picture of Isoxazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 113.901 C1 C2 H7 127.302
C1 C3 O5 110.851 C1 C3 H8 132.901
C2 C1 C3 104.457 C2 C1 H6 127.382
C2 N4 O5 103.546 C3 C1 H6 128.161
C3 O5 N4 107.245 N4 C2 H7 118.798
O5 C3 H8 116.247
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.342      
2 C 0.068      
3 C 0.158      
4 N -0.218      
5 O -0.353      
6 H 0.203      
7 H 0.240      
8 H 0.244      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.864 1.461 0.000 3.215
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -28.778 -2.502 0.000
y -2.502 -24.553 0.000
z 0.000 0.000 -30.148
Traceless
 xyz
x -1.427 -2.502 0.000
y -2.502 4.910 0.000
z 0.000 0.000 -3.483
Polar
3z2-r2-6.966
x2-y2-4.225
xy-2.502
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.580 -0.312 0.000
y -0.312 6.332 0.000
z 0.000 0.000 1.758


<r2> (average value of r2) Å2
<r2> 79.215
(<r2>)1/2 8.900