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 NH2CH2NH2 (diaminomethane)

using model chemistry: MP2/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/CEP-121G
 hartrees
Energy at 0K-28.579471
Energy at 298.15K-28.587364
HF Energy-28.266450
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy49.291681
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-121G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3459 3376 4.26      
2 A1 3036 2963 46.96      
3 A1 1727 1686 64.81      
4 A1 1492 1457 0.60      
5 A1 1067 1042 78.54      
6 A1 773 755 41.48      
7 A1 448 437 0.45      
8 A2 3600 3514 0.00      
9 A2 1393 1360 0.00      
10 A2 1060 1034 0.00      
11 A2 248 242 0.00      
12 B1 3600 3514 0.07      
13 B1 3115 3041 36.04      
14 B1 1375 1342 0.32      
15 B1 827 807 0.04      
16 B1 405 395 103.45      
17 B2 3461 3378 0.27      
18 B2 1715 1674 10.83      
19 B2 1414 1380 20.12      
20 B2 1054 1029 100.89      
21 B2 649 634 612.51      

Unscaled Zero Point Vibrational Energy (zpe) 17959.6 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 17528.6 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-121G
ABC
1.16228 0.28266 0.25871

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.560
N2 0.000 1.291 -0.198
N3 0.000 -1.291 -0.198
H4 0.893 0.000 1.200
H5 -0.893 0.000 1.200
H6 0.846 1.451 -0.749
H7 -0.846 1.451 -0.749
H8 -0.846 -1.451 -0.749
H9 0.846 -1.451 -0.749

Atom - Atom Distances (Å)
  C1 N2 N3 H4 H5 H6 H7 H8 H9
C11.49681.49681.09881.09882.12922.12922.12922.1292
N21.49682.58152.10172.10171.02191.02192.92172.9217
N31.49682.58152.10172.10172.92172.92171.02191.0219
H41.09882.10172.10171.78682.42992.98772.98772.4299
H51.09882.10172.10171.78682.98772.42992.42992.9877
H62.12921.02192.92172.42992.98771.69123.35892.9021
H72.12921.02192.92172.98772.42991.69122.90213.3589
H82.12922.92171.02192.98772.42993.35892.90211.6912
H92.12922.92171.02192.42992.98772.90213.35891.6912

picture of diaminomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 H6 114.094 C1 N2 H7 114.094
C1 N3 H8 114.094 C1 N3 H9 114.094
N2 C1 N3 119.169 N2 C1 H4 107.143
N2 C1 H5 107.143 N3 C1 H4 107.143
N3 C1 H5 107.143 H4 C1 H5 108.788
H6 N2 H7 111.673 H8 N3 H9 111.673
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability