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: G3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
1 2 no CS 1A'
1 3 no C2V 1A1

Conformer 1 (C2)

Jump to S1C2 S1C3
Energy calculated at G3
 hartrees
Energy at 0K-225.125254
Energy at 298.15K-225.119853
HF Energy-223.984692
Nuclear repulsion energy125.065905
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 HF/6-31G*
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 3926 3699 54.02      
2 A 3815 3595 5.46      
3 A 2000 1885 538.30      
4 A 1806 1701 0.02      
5 A 1304 1228 5.57      
6 A 1035 975 8.42      
7 A 649 611 90.91      
8 A 514 485 3.61      
9 A 417 393 99.25      
10 B 3926 3699 33.57      
11 B 3811 3591 69.33      
12 B 1812 1707 226.69      
13 B 1550 1461 244.17      
14 B 1166 1099 24.18      
15 B 882 831 180.94      
16 B 630 594 122.39      
17 B 599 564 239.29      
18 B 483 455 96.61      

Unscaled Zero Point Vibrational Energy (zpe) 15162.9 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 14286.5 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=FULL/6-31G*
ABC
0.36658 0.34667 0.18020

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.149
O2 0.000 0.000 1.372
N3 0.000 1.157 -0.619
N4 0.000 -1.157 -0.619
H5 0.206 1.987 -0.079
H6 0.453 1.124 -1.523
H7 -0.206 -1.987 -0.079
H8 -0.453 -1.124 -1.523

Atom - Atom Distances (Å)
  C1 O2 N3 N4 H5 H6 H7 H8
C11.22331.38851.38852.01052.06562.01052.0656
O21.22332.30292.30292.46903.13932.46903.1393
N31.38852.30292.31351.01161.01213.19642.4954
N41.38852.30292.31353.19642.49541.01161.0121
H52.01052.46901.01163.19641.70073.99523.4931
H62.06563.13931.01212.49541.70073.49312.4245
H72.01052.46903.19641.01163.99523.49311.7007
H82.06563.13932.49541.01213.49312.42451.7007

picture of Urea state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N3 H5 113.388 C1 N3 H6 117.744
C1 N4 H7 113.388 C1 N4 H8 117.744
O2 C1 N3 123.017 O2 C1 N4 123.017
N3 C1 N4 113.967 H5 N3 H6 114.410
H7 N4 H8 114.410
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS)

Jump to S1C1 S1C3
Energy calculated at G3
 hartrees
Energy at 0K-225.126675
Energy at 298.15K-225.121363
HF Energy-223.982603
Nuclear repulsion energy125.159001
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 HF/6-31G*
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' 3964 3735 64.64      
2 A' 3845 3623 15.85      
3 A' 1981 1866 579.52      
4 A' 1810 1706 11.24      
5 A' 1289 1215 5.12      
6 A' 1047 986 12.37      
7 A' 861 811 79.60      
8 A' 587 553 31.25      
9 A' 522 491 17.18      
10 A' 375 353 545.17      
11 A" 3961 3732 38.63      
12 A" 3836 3615 71.22      
13 A" 1800 1696 252.96      
14 A" 1554 1464 258.92      
15 A" 1123 1058 16.30      
16 A" 622 586 28.46      
17 A" 454 428 46.28      
18 A" 103i 97i 50.31      

Unscaled Zero Point Vibrational Energy (zpe) 14763.2 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 13909.9 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 MP2=FULL/6-31G*
ABC
0.37054 0.34463 0.17969

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.006 0.140 0.000
O2 0.043 1.366 0.000
N3 0.043 -0.609 1.163
N4 0.043 -0.609 -1.163
H5 -0.171 -0.069 1.991
H6 -0.319 -1.553 1.163
H7 -0.171 -0.069 -1.991
H8 -0.319 -1.553 -1.163

Atom - Atom Distances (Å)
  C1 O2 N3 N4 H5 H6 H7 H8
C11.22641.38411.38412.01002.07952.01002.0795
O21.22642.29212.29212.46393.16262.46393.1626
N31.38412.29212.32661.01091.01063.20732.5364
N41.38412.29212.32663.20732.53641.01091.0106
H52.01002.46391.01093.20731.70503.98233.4887
H62.07953.16261.01062.53641.70503.48872.3262
H72.01002.46393.20731.01093.98233.48871.7050
H82.07953.16262.53641.01063.48872.32621.7050

picture of Urea state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N3 H5 114.585 C1 N3 H6 121.060
C1 N4 H7 114.585 C1 N4 H8 121.060
O2 C1 N3 122.735 O2 C1 N4 122.735
N3 C1 N4 114.375 H5 N3 H6 116.168
H7 N4 H8 116.168
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 3 (C2V)

Jump to S1C1 S1C2
Energy calculated at G3
 hartrees
Energy at 0K-225.127373
Energy at 298.15K-225.122433
HF Energy-223.982192
Nuclear repulsion energy125.269488
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 HF/6-31G*
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 3991 3761 83.01      
2 A1 3865 3641 10.86      
3 A1 1969 1855 616.63      
4 A1 1798 1694 1.58      
5 A1 1265 1191 1.64      
6 A1 1055 994 10.72      
7 A1 521 491 2.90      
8 A2 439 413 0.00      
9 A2 433i 408i 0.00      
10 B1 861 811 47.58      
11 B1 611 576 10.00      
12 B1 274i 259i 684.87      
13 B2 3989 3758 44.02      
14 B2 3856 3633 96.21      
15 B2 1793 1689 305.39      
16 B2 1557 1467 277.01      
17 B2 1100 1036 10.77      
18 B2 616 581 20.17      

Unscaled Zero Point Vibrational Energy (zpe) 14288.1 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 13462.3 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=FULL/6-31G*
ABC
0.37106 0.34792 0.17956

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.143
O2 0.000 0.000 1.370
N3 0.000 1.155 -0.601
N4 0.000 -1.155 -0.601
H5 0.000 2.025 -0.093
H6 0.000 1.181 -1.608
H7 0.000 -2.025 -0.093
H8 0.000 -1.181 -1.608

Atom - Atom Distances (Å)
  C1 O2 N3 N4 H5 H6 H7 H8
C11.22761.37401.37402.03822.11112.03822.1111
O21.22762.28492.28492.49773.20332.49773.2033
N31.37402.28492.31061.00721.00683.22032.5435
N41.37402.28492.31063.22032.54351.00721.0068
H52.03822.49771.00723.22031.73434.04923.5452
H62.11113.20331.00682.54351.73433.54522.3611
H72.03822.49773.22031.00724.04923.54521.7343
H82.11113.20332.54351.00683.54522.36111.7343

picture of Urea state 1 conformation 3
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N3 H5 117.030 C1 N3 H6 123.993
C1 N4 H7 117.030 C1 N4 H8 123.993
O2 C1 N3 122.629 O2 C1 N4 122.629
N3 C1 N4 114.741 H5 N3 H6 118.977
H7 N4 H8 118.977
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability