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: B1B95/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at B1B95/STO-3G
 hartrees
Energy at 0K-281.661643
Energy at 298.15K-281.667646
Nuclear repulsion energy219.123852
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 B1B95/STO-3G
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 3552 3137 25.04      
2 A 3515 3104 0.95      
3 A 3510 3100 9.83      
4 A 3484 3076 0.55      
5 A 3331 2942 0.19      
6 A 1748 1544 20.28      
7 A 1655 1461 9.39      
8 A 1648 1455 6.17      
9 A 1563 1380 7.82      
10 A 1546 1366 10.69      
11 A 1443 1274 6.20      
12 A 1346 1188 11.03      
13 A 1255 1108 5.95      
14 A 1142 1008 5.87      
15 A 1125 993 1.70      
16 A 1100 971 7.23      
17 A 1060 936 0.06      
18 A 1014 896 1.37      
19 A 940 830 4.05      
20 A 923 815 0.22      
21 A 849 750 19.77      
22 A 676 597 0.92      
23 A 646 571 1.12      
24 A 602 531 1.03      
25 A 326 287 0.79      
26 A 254 224 0.71      
27 A 58 51 0.23      

Unscaled Zero Point Vibrational Energy (zpe) 20155.5 cm-1
Scaled (by 0.883) Zero Point Vibrational Energy (zpe) 17797.3 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 B1B95/STO-3G
ABC
0.29292 0.11458 0.08367

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/STO-3G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 2.145 0.014 0.000
H2 2.505 -0.523 -0.891
H3 2.572 1.025 -0.001
H4 2.505 -0.522 0.891
C5 0.633 0.107 -0.000
O6 -0.080 -1.097 0.000
N7 -1.484 -0.798 -0.000
C8 -1.538 0.564 0.000
H9 -2.515 1.061 -0.000
C10 -0.244 1.164 -0.000
H11 -0.004 2.227 0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.10081.09761.10081.51512.48723.71883.72434.77562.65193.0848
H21.10081.78721.78222.16712.79424.09684.28105.33853.34693.8280
H31.09761.78721.78722.14543.39674.44674.13585.08642.81952.8423
H41.10081.78221.78722.16712.79474.09714.28095.33843.34663.8274
C51.51512.16712.14542.16711.39942.30212.21883.28861.37402.2138
O62.48722.79423.39672.79471.39941.43552.21073.25302.26773.3252
N73.71884.09684.44674.09712.30211.43551.36312.12492.32103.3675
C83.72434.28104.13584.28092.21882.21071.36311.09511.42642.2625
H94.77565.33855.08645.33843.28863.25302.12491.09512.27252.7683
C102.65193.34692.81953.34661.37402.26772.32101.42642.27251.0895
H113.08483.82802.84233.82742.21383.32523.36752.26252.76831.0895

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 117.115 C1 C5 C10 133.188
H2 C1 H3 108.774 H2 C1 H4 108.097
H2 C1 C5 110.890 H3 C1 H4 108.773
H3 C1 C5 109.360 H4 C1 C5 110.890
C5 O6 N7 108.585 C5 C10 C8 104.793
C5 C10 H11 127.581 O6 C5 C10 109.697
O6 N7 C8 104.326 N7 C8 H9 119.227
N7 C8 C10 112.598 C8 C10 H11 127.626
H9 C8 C10 128.174
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.238      
2 H 0.102      
3 H 0.101      
4 H 0.102      
5 C 0.092      
6 O -0.073      
7 N -0.120      
8 C -0.035      
9 H 0.105      
10 C -0.131      
11 H 0.097      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.809 1.954 0.000 2.663
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.410 -2.920 0.000
y -2.920 -33.076 0.000
z 0.000 0.000 -32.691
Traceless
 xyz
x 2.474 -2.920 0.000
y -2.920 -1.526 0.000
z 0.000 0.000 -0.948
Polar
3z2-r2-1.895
x2-y22.667
xy-2.920
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.093 -0.329 0.000
y -0.329 4.419 0.000
z 0.000 0.000 1.588


<r2> (average value of r2) Å2
<r2> 139.021
(<r2>)1/2 11.791