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All results from a given calculation for NH2CH2NH2 (diaminomethane)

using model chemistry: PBEPBE/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBE/3-21G
 hartrees
Energy at 0K-150.169647
Energy at 298.15K-150.177505
HF Energy-150.169647
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy81.512205
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 PBEPBE/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 A1 3277 3247 17.67      
2 A1 3001 2974 35.62      
3 A1 1680 1664 26.19      
4 A1 1474 1461 3.14      
5 A1 1045 1036 35.24      
6 A1 712 705 4.72      
7 A1 429 425 5.59      
8 A2 3380 3350 0.00      
9 A2 1384 1371 0.00      
10 A2 1069 1059 0.00      
11 A2 286 283 0.00      
12 B1 3381 3350 9.39      
13 B1 3051 3023 22.96      
14 B1 1340 1327 1.43      
15 B1 810 803 0.09      
16 B1 446 442 114.60      
17 B2 3276 3246 2.35      
18 B2 1665 1650 0.28      
19 B2 1359 1347 3.14      
20 B2 1016 1007 20.06      
21 B2 582 577 573.57      

Unscaled Zero Point Vibrational Energy (zpe) 17330.6 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 17172.9 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 PBEPBE/3-21G
ABC
1.16788 0.28634 0.26177

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.552
N2 0.000 1.292 -0.184
N3 0.000 -1.292 -0.184
H4 0.891 0.000 1.202
H5 -0.891 0.000 1.202
H6 0.841 1.380 -0.783
H7 -0.841 1.380 -0.783
H8 -0.841 -1.380 -0.783
H9 0.841 -1.380 -0.783

Atom - Atom Distances (Å)
  C1 N2 N3 H4 H5 H6 H7 H8 H9
C11.48691.48691.10311.10312.09662.09662.09662.0966
N21.48692.58362.09412.09411.03651.03652.86492.8649
N31.48692.58362.09412.09412.86492.86491.03651.0365
H41.10312.09412.09411.78182.41872.97462.97462.4187
H51.10312.09412.09411.78182.97462.41872.41872.9746
H62.09661.03652.86492.41872.97461.68273.23332.7609
H72.09661.03652.86492.97462.41871.68272.76093.2333
H82.09662.86491.03652.97462.41873.23332.76091.6827
H92.09662.86491.03652.41872.97462.76093.23331.6827

picture of diaminomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 H6 111.121 C1 N2 H7 111.121
C1 N3 H8 111.121 C1 N3 H9 111.121
N2 C1 N3 120.644 N2 C1 H4 106.975
N2 C1 H5 106.975 N3 C1 H4 106.975
N3 C1 H5 106.975 H4 C1 H5 107.732
H6 N2 H7 108.533 H8 N3 H9 108.533
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.199      
2 N -0.635      
3 N -0.635      
4 H 0.228      
5 H 0.228      
6 H 0.254      
7 H 0.254      
8 H 0.254      
9 H 0.254      


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 -2.235 2.235
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.588 0.000 0.000
y 0.000 -25.537 0.000
z 0.000 0.000 -17.703
Traceless
 xyz
x 5.032 0.000 0.000
y 0.000 -8.391 0.000
z 0.000 0.000 3.359
Polar
3z2-r26.718
x2-y28.949
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.779 0.000 0.000
y 0.000 3.811 0.000
z 0.000 0.000 3.245


<r2> (average value of r2) Å2
<r2> 55.508
(<r2>)1/2 7.450