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/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 B1B95/CEP-31G*
 hartrees
Energy at 0K-51.375681
Energy at 298.15K-51.382031
Nuclear repulsion energy116.533856
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/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 3295 3154 0.16      
2 A 3257 3117 3.21      
3 A 3194 3058 13.14      
4 A 3163 3028 12.63      
5 A 3089 2957 14.88      
6 A 1668 1597 39.75      
7 A 1549 1483 47.55      
8 A 1481 1418 8.10      
9 A 1468 1406 10.20      
10 A 1408 1348 3.10      
11 A 1384 1324 9.06      
12 A 1292 1237 23.68      
13 A 1205 1154 11.47      
14 A 1056 1011 1.24      
15 A 1049 1004 7.02      
16 A 1025 981 20.45      
17 A 1010 967 3.05      
18 A 953 912 6.73      
19 A 918 878 2.83      
20 A 908 870 11.40      
21 A 840 804 58.26      
22 A 654 626 0.27      
23 A 637 610 2.26      
24 A 631 604 0.17      
25 A 319 305 2.31      
26 A 249 239 2.96      
27 A 100 96 0.87      

Unscaled Zero Point Vibrational Energy (zpe) 18901.3 cm-1
Scaled (by 0.9572) Zero Point Vibrational Energy (zpe) 18092.3 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/CEP-31G*
ABC
0.30349 0.11704 0.08584

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/CEP-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 2.125 0.014 0.000
H2 2.480 -0.529 -0.890
H3 2.564 1.021 -0.000
H4 2.480 -0.528 0.891
C5 0.623 0.112 -0.000
O6 -0.065 -1.052 0.000
N7 -1.429 -0.803 -0.000
C8 -1.547 0.514 0.000
H9 -2.547 0.947 0.000
C10 -0.269 1.174 -0.000
H11 -0.045 2.237 -0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.10161.09841.10161.50532.43563.64703.70584.76472.65963.1066
H21.10161.78921.78112.15682.74634.01864.25395.31463.35323.8494
H31.09841.78921.78922.14323.34774.39004.14205.11202.83662.8786
H41.10161.78111.78922.15682.74664.01874.25385.31443.35313.8491
C51.50532.15682.14322.15681.35182.24702.20683.27851.38612.2274
O62.43562.74633.34772.74661.35181.38682.15573.18692.23443.2887
N73.64704.01864.39004.01872.24701.38681.32212.07662.29213.3402
C83.70584.25394.14204.25382.20682.15571.32211.09021.43862.2857
H94.76475.31465.11205.31443.27853.18692.07661.09022.29022.8153
C102.65963.35322.83663.35311.38612.23442.29211.43862.29021.0867
H113.10663.84942.87863.84912.22743.28873.34022.28572.81531.0867

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 116.857 C1 C5 C10 133.758
H2 C1 H3 108.837 H2 C1 H4 107.885
H2 C1 C5 110.701 H3 C1 H4 108.837
H3 C1 C5 109.821 H4 C1 C5 110.702
C5 O6 N7 110.259 C5 C10 C8 102.733
C5 C10 H11 128.114 O6 C5 C10 109.385
O6 N7 C8 105.437 N7 C8 H9 118.503
N7 C8 C10 112.186 C8 C10 H11 129.153
H9 C8 C10 129.311
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.288      
2 H 0.160      
3 H 0.166      
4 H 0.160      
5 C -0.412      
6 O -0.001      
7 N 0.102      
8 C -0.621      
9 H 0.306      
10 C 0.086      
11 H 0.342      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.003 2.634 0.000 3.309
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.694 -3.699 -0.000
y -3.699 -34.898 -0.000
z -0.000 -0.000 -35.612
Traceless
 xyz
x 4.561 -3.699 -0.000
y -3.699 -1.745 -0.000
z -0.000 -0.000 -2.816
Polar
3z2-r2-5.632
x2-y24.204
xy-3.699
xz-0.000
yz-0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 9.528 -0.347 0.000
y -0.347 7.380 -0.000
z 0.000 -0.000 4.265


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000