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 C2H6N2O (Urea, methyl-)

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-262.053203
Energy at 298.15K-262.061277
HF Energy-261.542142
Nuclear repulsion energy180.440220
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 MP2/3-21G
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 3696 3528 24.72      
2 A 3614 3449 31.33      
3 A 3567 3404 24.24      
4 A 3168 3024 16.75      
5 A 3114 2972 37.28      
6 A 3058 2919 40.45      
7 A 1771 1690 283.71      
8 A 1712 1634 99.02      
9 A 1632 1558 16.50      
10 A 1591 1519 4.80      
11 A 1540 1469 25.93      
12 A 1489 1421 1.68      
13 A 1397 1334 275.88      
14 A 1216 1161 3.55      
15 A 1201 1146 1.25      
16 A 1135 1084 39.69      
17 A 1078 1029 45.63      
18 A 871 832 4.27      
19 A 778 742 90.26      
20 A 597 570 101.52      
21 A 558 533 130.99      
22 A 537 513 8.63      
23 A 485 463 22.31      
24 A 364 347 195.22      
25 A 282 270 14.48      
26 A 139 133 6.33      
27 A 106 101 6.13      

Unscaled Zero Point Vibrational Energy (zpe) 20348.2 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 19422.3 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 MP2/3-21G
ABC
0.32082 0.13568 0.09805

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.890 0.026 0.099
H2 -2.167 0.689 -0.730
H3 -2.684 -0.717 0.210
H4 -1.829 0.621 1.018
H5 -0.617 -1.697 -0.147
N6 -0.623 -0.684 -0.164
C7 0.639 -0.108 -0.023
H8 -0.137 1.808 -0.437
H9 1.515 1.736 0.061
N10 0.606 1.291 0.013
O11 1.692 -0.774 0.077

Atom - Atom Distances (Å)
  C1 H2 H3 H4 H5 N6 C7 H8 H9 N10 O11
C11.09781.09291.09602.15581.47602.53532.55603.81002.79993.6698
H21.09781.76901.78182.90442.14293.00162.33563.90822.93364.2051
H31.09291.76901.78102.31462.09493.38613.64374.86473.85964.3779
H41.09601.78181.78102.86302.13422.77612.52723.65232.71843.9021
H52.15582.90442.31462.86301.01292.02933.54954.04693.23342.4969
N61.47602.14292.09492.13421.01291.39422.55363.23702.33362.3288
C72.53533.00163.38612.77612.02931.39422.10872.04371.40081.2496
H82.55602.33563.64372.52723.54952.55362.10871.72681.01143.2060
H93.81003.90824.86473.65234.04693.23702.04371.72681.01242.5170
N102.79992.93363.85962.71843.23342.33361.40081.01141.01242.3344
O113.66984.20514.37793.90212.49692.32881.24963.20602.51702.3344

picture of Urea, methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N6 H5 118.851 C1 N6 C7 124.064
H2 C1 H3 107.702 H2 C1 H4 108.616
H2 C1 N6 111.882 H3 C1 H4 108.906
H3 C1 N6 108.342 H4 C1 N6 111.287
H5 N6 C7 113.993 N6 C7 N10 113.220
N6 C7 O11 123.399 C7 N10 H8 121.053
C7 N10 H9 114.803 H8 N10 H9 117.136
N10 C7 O11 123.375
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at MP2/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.350     -0.024
2 H 0.179     0.042
3 H 0.202     0.095
4 H 0.201     0.068
5 H 0.324     0.340
6 N -0.728     -0.632
7 C 0.844     0.820
8 H 0.311     0.407
9 H 0.319     0.397
10 N -0.788     -0.955
11 O -0.515     -0.558


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -3.296 1.875 -0.521 3.827
CHELPG        
AIM        
ESP -3.342 1.884 -0.569 3.878


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.556 4.917 -0.664
y 4.917 -25.853 -1.416
z -0.664 -1.416 -31.673
Traceless
 xyz
x -2.793 4.917 -0.664
y 4.917 5.762 -1.416
z -0.664 -1.416 -2.969
Polar
3z2-r2-5.938
x2-y2-5.704
xy4.917
xz-0.664
yz-1.416


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.352 -0.217 0.321
y -0.217 5.339 -0.052
z 0.321 -0.052 2.637


<r2> (average value of r2) Å2
<r2> 121.131
(<r2>)1/2 11.006