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 NH2CONH2 (Urea)

using model chemistry: PBEPBE/6-311+G(3df,2p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at PBEPBE/6-311+G(3df,2p)
 hartrees
Energy at 0K-225.108602
Energy at 298.15K-225.114629
HF Energy-225.108602
Nuclear repulsion energy123.065305
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/6-311+G(3df,2p)
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 3609 3580 29.03      
2 A 3496 3467 1.75      
3 A 1738 1724 406.20      
4 A 1573 1560 0.08      
5 A 1135 1126 3.17      
6 A 928 920 8.88      
7 A 529 525 57.96      
8 A 458 454 1.63      
9 A 362 359 57.71      
10 B 3608 3579 34.78      
11 B 3490 3462 31.35      
12 B 1572 1559 174.28      
13 B 1367 1356 198.86      
14 B 1003 995 26.09      
15 B 746 740 33.09      
16 B 561 556 75.86      
17 B 519 515 118.51      
18 B 431 428 181.67      

Unscaled Zero Point Vibrational Energy (zpe) 13562.4 cm-1
Scaled (by 0.9918) Zero Point Vibrational Energy (zpe) 13451.2 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/6-311+G(3df,2p)
ABC
0.36938 0.34245 0.17914

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-311+G(3df,2p)

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.143
O2 0.000 0.000 1.367
N3 0.000 1.167 -0.613
N4 0.000 -1.167 -0.613
H5 0.219 1.995 -0.069
H6 0.420 1.145 -1.537
H7 -0.219 -1.995 -0.069
H8 -0.420 -1.145 -1.537

Atom - Atom Distances (Å)
  C1 O2 N3 N4 H5 H6 H7 H8
C11.22451.38981.38982.01762.07552.01762.0755
O21.22452.29802.29802.46743.14962.46743.1496
N31.38982.29802.33311.01461.01533.21512.5245
N41.38982.29802.33313.21512.52451.01461.0153
H52.01762.46741.01463.21511.70814.01313.5241
H62.07553.14961.01532.52451.70813.52412.4390
H72.01762.46743.21511.01464.01313.52411.7081
H82.07553.14962.52451.01533.52412.43901.7081

picture of Urea state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N3 H5 113.176 C1 N3 H6 118.471
C1 N4 H7 113.176 C1 N4 H8 118.471
O2 C1 N3 122.925 O2 C1 N4 122.925
N3 C1 N4 114.150 H5 N3 H6 114.594
H7 N4 H8 114.594
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-311+G(3df,2p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 1.441      
2 O -0.743      
3 N -0.716      
4 N -0.716      
5 H 0.184      
6 H 0.182      
7 H 0.184      
8 H 0.182      


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 -3.751 3.751
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.620 3.124 0.000
y 3.124 -18.257 0.000
z 0.000 0.000 -25.589
Traceless
 xyz
x -3.697 3.124 0.000
y 3.124 7.347 0.000
z 0.000 0.000 -3.650
Polar
3z2-r2-7.301
x2-y2-7.363
xy3.124
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.109 0.098 0.000
y 0.098 6.373 0.000
z 0.000 0.000 6.354


<r2> (average value of r2) Å2
<r2> 69.606
(<r2>)1/2 8.343