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 H2NCHCHNH2 (diaminoethylene)

using model chemistry: TPSSh/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at TPSSh/3-21G
 hartrees
Energy at 0K-188.249674
Energy at 298.15K 
HF Energy-188.249674
Nuclear repulsion energy116.576771
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 TPSSh/3-21G
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 3541 3430 0.36      
2 A 3429 3322 0.53      
3 A 3148 3049 0.13      
4 A 1727 1674 0.34      
5 A 1703 1649 17.17      
6 A 1355 1312 1.66      
7 A 1282 1242 0.11      
8 A 1019 987 0.41      
9 A 947 917 89.15      
10 A 637 618 279.55      
11 A 551 534 3.09      
12 A 356 344 0.50      
13 A 250 242 25.44      
14 B 3540 3430 1.01      
15 B 3426 3320 0.08      
16 B 3153 3055 55.36      
17 B 1709 1655 49.59      
18 B 1405 1361 2.76      
19 B 1164 1127 71.96      
20 B 1134 1098 9.95      
21 B 791 766 15.68      
22 B 562 545 428.22      
23 B 344 333 53.95      
24 B 221 214 185.43      

Unscaled Zero Point Vibrational Energy (zpe) 18694.9 cm-1
Scaled (by 0.9688) Zero Point Vibrational Energy (zpe) 18111.7 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 TPSSh/3-21G
ABC
1.43351 0.13010 0.12093

See section I.F.4 to change rotational constant units
Geometric Data calculated at TPSSh/3-21G

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.315 0.595 0.046
C2 -0.315 -0.595 0.046
N3 -0.315 1.862 -0.102
N4 0.315 -1.862 -0.102
H5 1.403 0.639 0.053
H6 -1.403 -0.639 0.053
H7 -1.335 1.830 -0.153
H8 1.335 -1.830 -0.153
H9 0.018 2.588 0.537
H10 -0.018 -2.588 0.537

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8 H9 H10
C11.34661.42282.46161.08882.11542.07122.63892.07373.2376
C21.34662.46161.42282.11541.08882.63892.07123.23762.0737
N31.42282.46163.77702.11462.73191.02214.04491.02284.5053
N42.46161.42283.77702.73192.11464.04491.02214.50531.0228
H51.08882.11542.11462.73193.08342.99352.47902.43933.5589
H62.11541.08882.73192.11463.08342.47902.99353.55892.4393
H72.07122.63891.02214.04492.99352.47904.53161.69754.6618
H82.63892.07124.04491.02212.47902.99354.53164.66181.6975
H92.07373.23761.02284.50532.43933.55891.69754.66185.1757
H103.23762.07374.50531.02283.55892.43934.66181.69755.1757

picture of diaminoethylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 125.432 C1 C2 H6 120.216
C1 N3 H7 114.819 C1 N3 H9 114.992
C2 C1 N3 125.432 C2 C1 H5 120.216
C2 N4 H8 114.819 C2 N4 H10 114.992
N3 C1 H5 114.029 N4 C2 H6 114.029
H7 N3 H9 112.220 H8 N4 H10 112.220
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at TPSSh/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.042      
2 C -0.042      
3 N -0.726      
4 N -0.726      
5 H 0.194      
6 H 0.194      
7 H 0.288      
8 H 0.288      
9 H 0.287      
10 H 0.287      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 2.203 2.203
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.754 0.085 0.000
y 0.085 8.360 0.000
z 0.000 0.000 1.845


<r2> (average value of r2) Å2
<r2> 98.938
(<r2>)1/2 9.947