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 CH3CHNOH (Acetaldoxime)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no CS trans 1A'
1 2 yes CS cis 1A'

Conformer 1 (CS trans)

Jump to S1C2
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-39.762600
Energy at 298.15K-39.768534
HF Energy-39.185976
Nuclear repulsion energy65.207399
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/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 3792 3600 71.76      
2 A 3211 3049 17.14      
3 A 3160 3000 13.50      
4 A 3092 2935 23.03      
5 A 1683 1598 0.65      
6 A 1511 1435 8.94      
7 A 1462 1388 1.06      
8 A 1408 1337 33.43      
9 A 1270 1206 49.70      
10 A 1170 1111 5.04      
11 A 1013 961 99.28      
12 A 912 865 15.89      
13 A 554 526 17.90      
14 A 317 301 1.77      
15 A 3178 3017 22.68      
16 A 1503 1427 12.21      
17 A 1084 1030 1.38      
18 A 894 849 18.93      
19 A 393 373 163.24      
20 A 278 264 3.17      
21 A 192 183 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 16038.3 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 15226.8 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/CEP-31G*
ABC
1.45819 0.13816 0.12932

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.327 1.311 0.000
C2 0.000 0.574 0.000
N3 -0.004 -0.729 0.000
O4 1.349 -1.206 0.000
H5 1.211 -2.174 0.000
H6 -2.156 0.585 0.000
H7 -1.407 1.956 0.893
H8 -1.407 1.956 -0.893
H9 0.955 1.124 0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.51762.43123.67354.31111.10211.10511.10512.2890
C21.51761.30322.23343.00322.15582.16522.16521.1016
N32.43121.30321.43491.88812.52113.15883.15882.0864
O43.67352.23341.43490.97823.93594.28884.28882.3628
H54.31113.00321.88810.97824.35294.97134.97133.3080
H61.10212.15582.52113.93594.35291.80021.80023.1567
H71.10512.16523.15884.28884.97131.80021.78652.6584
H81.10512.16523.15884.28884.97131.80021.78652.6584
H92.28901.10162.08642.36283.30803.15672.65842.6584

picture of Acetaldoxime state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 118.866 C1 C2 H9 121.011
C2 C1 H6 109.739 C2 C1 H7 110.304
C2 C1 H8 110.304 C2 N3 O4 109.219
N3 C2 H9 120.123 N3 O4 H5 101.281
H6 C1 H7 109.300 H6 C1 H8 109.300
H7 C1 H8 107.861
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS cis)

Jump to S1C1
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-39.763459
Energy at 298.15K 
HF Energy-39.185579
Nuclear repulsion energy66.695460
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/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' 3796 3604 77.70      
2 A' 3238 3075 8.36      
3 A' 3215 3052 9.80      
4 A' 3098 2941 17.87      
5 A' 1701 1615 3.39      
6 A' 1507 1430 15.48      
7 A' 1437 1364 13.69      
8 A' 1375 1305 35.77      
9 A' 1337 1270 42.29      
10 A' 1164 1105 8.61      
11 A' 943 896 84.21      
12 A' 918 871 29.21      
13 A' 662 628 12.52      
14 A' 311 295 1.94      
15 A" 3179 3018 19.73      
16 A" 1513 1436 14.15      
17 A" 1078 1023 1.41      
18 A" 858 814 22.40      
19 A" 488 463 45.80      
20 A" 391 371 106.15      
21 A" 84i 80i 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 16061.2 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 15248.5 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/CEP-31G*
ABC
0.57211 0.20700 0.15653

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.468 0.485 0.000
C2 0.000 0.878 0.000
N3 1.044 0.094 0.000
O4 0.651 -1.283 0.000
H5 1.523 -1.725 0.000
H6 -1.583 -0.607 0.000
H7 -1.964 0.908 0.892
H8 -1.964 0.908 -0.892
H9 0.281 1.939 0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.51952.54222.75923.71861.09851.10511.10512.2740
C21.51951.30572.25693.01572.17102.15722.15721.0971
N32.54221.30571.43241.88092.71953.24143.24141.9960
O42.75922.25691.43240.97802.33373.52593.52593.2427
H53.71863.01571.88090.97803.30114.45944.45943.8682
H61.09852.17102.71952.33373.30111.79951.79953.1555
H71.10512.15723.24143.52594.45941.79951.78472.6262
H81.10512.15723.24143.52594.45941.79951.78472.6262
H92.27401.09711.99603.24273.86823.15552.62622.6262

picture of Acetaldoxime state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 128.110 C1 C2 H9 119.836
C2 C1 H6 111.025 C2 C1 H7 109.537
C2 C1 H8 109.537 C2 N3 O4 110.945
N3 C2 H9 112.054 N3 O4 H5 100.901
H6 C1 H7 109.492 H6 C1 H8 109.492
H7 C1 H8 107.694
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability