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 CH3CONH2 (Acetamide)

using model chemistry: MP2=FULL/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at MP2=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-208.763754
Energy at 298.15K-208.769512
HF Energy-208.001998
Nuclear repulsion energy122.049971
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=FULL/6-31G(2df,p)
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 3820 3591 50.51      
2 A 3673 3453 51.52      
3 A 3257 3061 2.11      
4 A 3213 3020 4.58      
5 A 3125 2937 3.22      
6 A 1833 1723 262.03      
7 A 1635 1537 100.02      
8 A 1527 1435 7.87      
9 A 1511 1420 10.93      
10 A 1431 1345 98.29      
11 A 1364 1282 69.38      
12 A 1137 1069 0.77      
13 A 1075 1011 4.00      
14 A 995 935 7.44      
15 A 868 816 1.45      
16 A 658 618 8.72      
17 A 557 523 16.31      
18 A 535 503 4.96      
19 A 418 393 3.26      
20 A 196 184 213.45      
21 A 60 57 0.94      

Unscaled Zero Point Vibrational Energy (zpe) 16443.7 cm-1
Scaled (by 0.9399) Zero Point Vibrational Energy (zpe) 15455.4 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=FULL/6-31G(2df,p)
ABC
0.35984 0.31497 0.17347

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.364 -0.279 0.000
C2 0.084 0.158 0.001
N3 0.967 -0.882 -0.031
O4 0.432 1.319 0.004
H5 -1.990 0.605 -0.057
H6 -1.572 -0.931 -0.848
H7 -1.597 -0.829 0.912
H8 1.942 -0.666 0.070
H9 0.675 -1.831 0.103

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.51172.40762.40361.08441.08961.08973.32932.5644
C21.51171.36491.21252.12182.15542.15082.03432.0776
N32.40761.36492.26593.30972.66742.73191.00421.0019
O42.40361.21252.26592.52563.13083.09062.49543.1614
H51.08442.12183.30972.52561.77671.77434.13433.6139
H61.08962.15542.66743.13081.77671.76273.64182.6010
H71.08972.15082.73193.09061.77431.76273.64122.6110
H83.32932.03431.00422.49544.13433.64183.64121.7220
H92.56442.07761.00193.16143.61392.60102.61101.7220

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.544 C1 C2 O4 123.478
C2 C1 H5 108.510 C2 C1 H6 110.860
C2 C1 H7 110.490 C2 N3 H8 117.523
C2 N3 H9 122.002 N3 C2 O4 122.964
H5 C1 H6 109.619 H5 C1 H7 109.388
H6 C1 H7 107.959 H8 N3 H9 118.261
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability