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 C4H8 (cyclobutane)

using model chemistry: B2PLYP=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2D 1A1
Energy calculated at B2PLYP=FULL/6-31+G**
 hartrees
Energy at 0K-157.038935
Energy at 298.15K-157.048111
HF Energy-156.843797
Nuclear repulsion energy127.113049
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 B2PLYP=FULL/6-31+G**
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 3134 2980 0.00      
2 A1 3098 2946 0.00      
3 A1 1551 1475 0.00      
4 A1 1195 1137 0.00      
5 A1 1031 981 0.00      
6 A1 221 210 0.00      
7 A2 1272 1209 0.00      
8 A2 969 922 0.00      
9 B1 1276 1213 0.00      
10 B1 1180 1122 0.00      
11 B1 956 909 0.00      
12 B2 3164 3009 105.38      
13 B2 3089 2938 13.53      
14 B2 1515 1441 4.38      
15 B2 910 865 0.00      
16 B2 638 607 2.31      
17 E 3147 2993 22.75      
17 E 3147 2993 22.75      
18 E 3091 2940 85.77      
18 E 3091 2940 85.77      
19 E 1510 1436 0.48      
19 E 1510 1436 0.48      
20 E 1309 1245 1.97      
20 E 1309 1245 1.97      
21 E 1262 1200 0.33      
21 E 1262 1200 0.33      
22 E 929 883 3.11      
22 E 929 883 3.11      
23 E 768 730 0.33      
23 E 768 730 0.33      

Unscaled Zero Point Vibrational Energy (zpe) 24614.0 cm-1
Scaled (by 0.951) Zero Point Vibrational Energy (zpe) 23407.9 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 B2PLYP=FULL/6-31+G**
ABC
0.35736 0.35736 0.21256

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/6-31+G**

Point Group is D2d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.080 0.135
C2 0.000 -1.080 0.135
C3 -1.080 0.000 -0.135
C4 1.080 0.000 -0.135
H5 0.000 1.395 1.181
H6 0.000 1.970 -0.497
H7 0.000 -1.395 1.181
H8 0.000 -1.970 -0.497
H9 -1.395 0.000 -1.181
H10 -1.970 0.000 0.497
H11 1.395 0.000 -1.181
H12 1.970 0.000 0.497

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12
C12.15971.55081.55081.09251.09172.68683.11462.20082.27552.20082.2755
C22.15971.55081.55082.68683.11461.09251.09172.20082.27552.20082.2755
C31.55081.55082.15972.20082.27552.20082.27551.09251.09172.68683.1146
C41.55081.55082.15972.20082.27552.20082.27552.68683.11461.09251.0917
H51.09252.68682.20082.20081.77382.79013.76023.07742.50893.07742.5089
H61.09173.11462.27552.27551.77383.76023.93992.50892.95812.50892.9581
H72.68681.09252.20082.20082.79013.76021.77383.07742.50893.07742.5089
H83.11461.09172.27552.27553.76023.93991.77382.50892.95812.50892.9581
H92.20082.20081.09252.68683.07742.50893.07742.50891.77382.79013.7602
H102.27552.27551.09173.11462.50892.95812.50892.95811.77383.76023.9399
H112.20082.20082.68681.09253.07742.50893.07742.50892.79013.76021.7738
H122.27552.27553.11461.09172.50892.95812.50892.95813.76023.93991.7738

picture of cyclobutane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C2 88.265 C1 C3 H9 111.562
C1 C3 H10 117.840 C1 C4 C2 88.265
C1 C4 H11 111.562 C1 C4 H12 117.840
C2 C3 H9 111.562 C2 C3 H10 117.840
C2 C4 H11 111.562 C2 C4 H12 117.840
C3 C1 C4 88.265 C3 C1 H5 111.562
C3 C1 H6 117.840 C3 C2 C4 88.265
C3 C2 H7 111.562 C3 C2 H8 117.840
C4 C1 H5 111.562 C4 C1 H6 117.840
C4 C2 H7 111.562 C4 C2 H8 117.840
H5 C1 H6 108.609 H7 C2 H8 108.609
H9 C3 H10 108.609 H11 C4 H12 108.609
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability