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 C5H8 (Cyclobutane, methylene-)

using model chemistry: MP2=FULL/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2=FULL/3-21G*
 hartrees
Energy at 0K-193.318593
Energy at 298.15K-193.326965
HF Energy-192.861865
Nuclear repulsion energy165.256296
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=FULL/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' 3198 3032 32.41      
2 A' 3164 3000 6.85      
3 A' 3163 2998 9.85      
4 A' 3131 2969 28.57      
5 A' 3111 2950 1.82      
6 A' 1736 1646 6.35      
7 A' 1583 1501 0.09      
8 A' 1561 1480 0.77      
9 A' 1523 1443 0.26      
10 A' 1296 1228 0.37      
11 A' 1261 1196 0.04      
12 A' 1118 1060 0.06      
13 A' 937 889 26.87      
14 A' 936 887 19.88      
15 A' 858 813 0.04      
16 A' 756 717 2.29      
17 A' 673 638 0.53      
18 A' 368 349 7.18      
19 A' 41 39 0.01      
20 A" 3245 3077 10.80      
21 A" 3169 3004 1.44      
22 A" 3109 2947 33.98      
23 A" 1557 1476 3.28      
24 A" 1305 1238 0.27      
25 A" 1286 1219 0.51      
26 A" 1271 1205 0.56      
27 A" 1218 1155 4.50      
28 A" 1104 1047 0.02      
29 A" 908 860 0.04      
30 A" 891 845 1.73      
31 A" 849 805 0.01      
32 A" 661 626 0.03      
33 A" 367 348 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 25676.9 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 24341.7 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 MP2=FULL/3-21G*
ABC
0.34064 0.14953 0.11085

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.068 -0.434 1.124
C2 0.068 -0.434 -1.124
C3 0.000 0.631 0.000
C4 -0.033 -1.554 0.000
C5 -0.103 1.960 0.000
H6 -0.759 -0.415 1.840
H7 -0.759 -0.415 -1.840
H8 1.023 -0.443 1.658
H9 1.023 -0.443 -1.658
H10 -0.151 2.529 0.925
H11 -0.151 2.529 -0.925
H12 0.779 -2.284 0.000
H13 -0.997 -2.067 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C12.24821.54971.59032.65001.09343.07701.09442.94152.97803.60932.27852.2506
C22.24821.54971.59032.65003.07701.09342.94151.09443.60932.97802.27852.2506
C31.54971.54972.18531.33302.24802.24802.22412.22412.11722.11723.01672.8764
C41.59031.59032.18533.51482.28252.28252.25832.25834.18884.18881.09171.0919
C52.65002.65001.33303.51483.07453.07453.12853.12851.08721.08724.33424.1250
H61.09343.07702.24802.28253.07453.67951.79123.92543.14244.08423.04022.4844
H73.07701.09342.24802.28253.07453.67953.92541.79124.08423.14243.04022.4844
H81.09442.94152.22412.25833.12851.79123.92543.31583.27814.10842.48953.0772
H92.94151.09442.22412.25833.12853.92541.79123.31584.10843.27812.48953.0772
H102.97803.60932.11724.18881.08723.14244.08423.27814.10841.84964.98844.7646
H113.60932.97802.11724.18881.08724.08423.14244.10843.27811.84964.98844.7646
H122.27852.27853.01671.09174.33423.04023.04022.48952.48954.98844.98841.7895
H132.25062.25062.87641.09194.12502.48442.48443.07723.07724.76464.76461.7895

picture of Cyclobutane, methylene- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C2 92.995 C1 C3 C5 133.497
C1 C4 C2 89.958 C1 C4 H12 115.055
C1 C4 H13 112.760 C2 C3 C5 133.497
C2 C4 H12 115.055 C2 C4 H13 112.760
C3 C1 C4 88.197 C3 C1 H6 115.453
C3 C1 H8 113.404 C3 C2 C4 88.197
C3 C2 H7 115.453 C3 C2 H9 113.404
C3 C5 H10 121.717 C3 C5 H11 121.717
C4 C1 H6 115.285 C4 C1 H8 113.239
C4 C2 H7 115.285 C4 C2 H9 113.239
H6 C1 H8 109.918 H7 C2 H9 109.918
H10 C5 H11 116.565 H12 C4 H13 110.068
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability