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: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-193.310242
Energy at 298.15K-193.318607
HF Energy-192.861808
Nuclear repulsion energy165.217885
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' 3197 3042 32.57      
2 A' 3164 3010 6.93      
3 A' 3162 3008 9.94      
4 A' 3131 2979 28.71      
5 A' 3111 2959 1.74      
6 A' 1736 1651 6.31      
7 A' 1583 1506 0.09      
8 A' 1561 1485 0.72      
9 A' 1522 1448 0.25      
10 A' 1295 1232 0.34      
11 A' 1262 1200 0.04      
12 A' 1118 1064 0.05      
13 A' 937 891 20.76      
14 A' 935 889 25.99      
15 A' 857 815 0.04      
16 A' 757 720 2.28      
17 A' 673 640 0.52      
18 A' 367 349 7.17      
19 A' 38 36 0.01      
20 A" 3245 3087 10.85      
21 A" 3168 3014 1.28      
22 A" 3108 2957 34.30      
23 A" 1557 1481 3.24      
24 A" 1305 1241 0.27      
25 A" 1286 1223 0.51      
26 A" 1271 1209 0.54      
27 A" 1218 1159 4.51      
28 A" 1104 1050 0.02      
29 A" 908 863 0.05      
30 A" 890 847 1.71      
31 A" 849 808 0.01      
32 A" 660 628 0.02      
33 A" 367 349 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 25670.5 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 24420.3 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
0.34059 0.14945 0.11077

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.063 -0.434 1.125
C2 0.063 -0.434 -1.125
C3 0.000 0.631 0.000
C4 -0.031 -1.555 0.000
C5 -0.097 1.961 0.000
H6 -0.768 -0.416 1.835
H7 -0.768 -0.416 -1.835
H8 1.015 -0.442 1.664
H9 1.015 -0.442 -1.664
H10 -0.141 2.530 0.925
H11 -0.141 2.530 -0.925
H12 0.787 -2.278 0.000
H13 -0.991 -2.075 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C12.24901.55011.59062.65051.09363.07411.09452.94702.97843.60992.27792.2518
C22.24901.55011.59062.65053.07411.09362.94701.09453.60992.97842.27792.2518
C31.55011.55012.18621.33332.24772.24772.22522.22522.11762.11763.01372.8821
C41.59061.59062.18623.51632.28212.28212.25952.25954.19054.19051.09181.0921
C52.65052.65051.33333.51633.07643.07643.12713.12711.08731.08734.33014.1339
H61.09363.07412.24772.28213.07643.67021.79143.92773.14664.08543.04192.4844
H73.07411.09362.24772.28213.07643.67023.92771.79144.08543.14663.04192.4844
H81.09452.94702.22522.25953.12711.79143.92773.32893.27394.10812.48923.0767
H92.94701.09452.22522.25953.12713.92771.79143.32894.10813.27392.48923.0767
H102.97843.60992.11764.19051.08733.14664.08543.27394.10811.84994.98424.7742
H113.60992.97842.11764.19051.08734.08543.14664.10813.27391.84994.98424.7742
H122.27792.27793.01371.09184.33013.04193.04192.48922.48924.98424.98421.7896
H132.25182.25182.88211.09214.13392.48442.48443.07673.07674.77424.77421.7896

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 93.014 C1 C3 C5 133.488
C1 C4 C2 89.978 C1 C4 H12 114.981
C1 C4 H13 112.830 C2 C3 C5 133.488
C2 C4 H12 114.981 C2 C4 H13 112.830
C3 C1 C4 88.217 C3 C1 H6 115.388
C3 C1 H8 113.465 C3 C2 C4 88.217
C3 C2 H7 115.388 C3 C2 H9 113.465
C3 C5 H10 121.716 C3 C5 H11 121.716
C4 C1 H6 115.219 C4 C1 H8 113.303
C4 C2 H7 115.219 C4 C2 H9 113.303
H6 C1 H8 109.913 H7 C2 H9 109.913
H10 C5 H11 116.568 H12 C4 H13 110.063
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability