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: MP4/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2D 1A1
Energy calculated at MP4/TZVP
 hartrees
Energy at 0K-156.813263
Energy at 298.15K-156.822495
HF Energy-156.145097
Nuclear repulsion energy127.107761
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 MP4/TZVP
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 3117 3001        
2 A1 3072 2958        
3 A1 1539 1482        
4 A1 1197 1153        
5 A1 1027 989        
6 A1 266 256        
7 A2 1256 1210        
8 A2 959 924        
9 B1 1271 1223        
10 B1 1145 1103        
11 B1 937 903        
12 B2 3144 3028        
13 B2 3066 2953        
14 B2 1508 1452        
15 B2 930 896        
16 B2 628 605        
17 E 3129 3013        
17 E 3129 3013        
18 E 3068 2954        
18 E 3068 2954        
19 E 1502 1446        
19 E 1502 1446        
20 E 1304 1256        
20 E 1304 1256        
21 E 1253 1206        
21 E 1253 1206        
22 E 918 884        
22 E 918 884        
23 E 766 738        
23 E 766 738        

Unscaled Zero Point Vibrational Energy (zpe) 24470.3 cm-1
Scaled (by 0.9629) Zero Point Vibrational Energy (zpe) 23562.5 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 MP4/TZVP
ABC
0.35665 0.35665 0.21399

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/TZVP

Point Group is D2d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.076 0.153
C2 0.000 -1.076 0.153
C3 -1.076 0.000 -0.153
C4 1.076 0.000 -0.153
H5 0.000 1.331 1.217
H6 0.000 1.994 -0.439
H7 0.000 -1.331 1.217
H8 0.000 -1.994 -0.439
H9 -1.331 0.000 -1.217
H10 -1.994 0.000 0.439
H11 1.331 0.000 -1.217
H12 1.994 0.000 0.439

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12
C12.15251.55261.55261.09401.09252.63233.12712.19302.28402.19302.2840
C22.15251.55261.55262.63233.12711.09401.09252.19302.28402.19302.2840
C31.55261.55262.15252.19302.28402.19302.28401.09401.09252.63233.1271
C41.55261.55262.15252.19302.28402.19302.28402.63233.12711.09401.0925
H51.09402.63232.19302.19301.78382.66303.71533.07762.52103.07762.5210
H61.09253.12712.28402.28401.78383.71533.98852.52102.95372.52102.9537
H72.63231.09402.19302.19302.66303.71531.78383.07762.52103.07762.5210
H83.12711.09252.28402.28403.71533.98851.78382.52102.95372.52102.9537
H92.19302.19301.09402.63233.07762.52103.07762.52101.78382.66303.7153
H102.28402.28401.09253.12712.52102.95372.52102.95371.78383.71533.9885
H112.19302.19302.63231.09403.07762.52103.07762.52102.66303.71531.7838
H122.28402.28403.12711.09252.52102.95372.52102.95373.71533.98851.7838

picture of cyclobutane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C2 87.764 C1 C3 H9 110.720
C1 C3 H10 118.384 C1 C4 C2 87.764
C1 C4 H11 110.720 C1 C4 H12 118.384
C2 C3 H9 110.720 C2 C3 H10 118.384
C2 C4 H11 110.720 C2 C4 H12 118.384
C3 C1 C4 87.764 C3 C1 H5 110.720
C3 C1 H6 118.384 C3 C2 C4 87.764
C3 C2 H7 110.720 C3 C2 H8 118.384
C4 C1 H5 110.720 C4 C1 H6 118.384
C4 C2 H7 110.720 C4 C2 H8 118.384
H5 C1 H6 109.337 H7 C2 H8 109.337
H9 C3 H10 109.337 H11 C4 H12 109.337
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability