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All results from a given calculation for C4H8 (cyclobutane)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2D 1A1
Energy calculated at CBS-Q
 hartrees
Energy at 0K-156.858315
Energy at 298.15K-156.853187
HF Energy-156.095259
Nuclear repulsion energy127.290843
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 CBS-Q
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3246 3246 0.00      
2 A1 3220 3220 0.00      
3 A1 1666 1666 0.00      
4 A1 1284 1284 0.00      
5 A1 1080 1080 0.00      
6 A1 202 202 0.00      
7 A2 1373 1373 0.00      
8 A2 1037 1037 0.00      
9 B1 1386 1386 0.00      
10 B1 1281 1281 0.00      
11 B1 1010 1010 0.00      
12 B2 3279 3279 146.96      
13 B2 3205 3205 12.13      
14 B2 1620 1620 2.83      
15 B2 960 960 0.17      
16 B2 683 683 1.78      
17 E 3259 3259 24.89      
17 E 3259 3259 24.89      
18 E 3210 3210 102.24      
18 E 3210 3210 102.24      
19 E 1621 1621 0.02      
19 E 1621 1621 0.02      
20 E 1425 1425 0.19      
20 E 1425 1425 0.19      
21 E 1359 1359 0.06      
21 E 1359 1359 0.06      
22 E 982 982 2.75      
22 E 982 982 2.75      
23 E 806 806 0.29      
23 E 806 806 0.29      

Unscaled Zero Point Vibrational Energy (zpe) 25927.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 25927.4 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 CBS-Q
ABC
0.35612 0.35612 0.21320

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is D2d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.080 0.124
C2 0.000 -1.080 0.124
C3 -1.080 0.000 -0.124
C4 1.080 0.000 -0.124
H5 0.000 1.418 1.158
H6 0.000 1.954 -0.523
H7 0.000 -1.418 1.158
H8 0.000 -1.954 -0.523
H9 -1.418 0.000 -1.158
H10 -1.954 0.000 0.523
H11 1.418 0.000 -1.158
H12 1.954 0.000 0.523

Atom - Atom Distances (Å)
  C1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12
C12.16101.54801.54801.08751.08672.70413.10232.19572.26792.19572.2679
C22.16101.54801.54802.70413.10231.08751.08672.19572.26792.19572.2679
C31.54801.54802.16102.19572.26792.19572.26791.08751.08672.70413.1023
C41.54801.54802.16102.19572.26792.19572.26792.70413.10231.08751.0867
H51.08752.70412.19572.19571.76402.83653.76753.06322.49613.06322.4961
H61.08673.10232.26792.26791.76403.76753.90712.49612.95422.49612.9542
H72.70411.08752.19572.19572.83653.76751.76403.06322.49613.06322.4961
H83.10231.08672.26792.26793.76753.90711.76402.49612.95422.49612.9542
H92.19572.19571.08752.70413.06322.49613.06322.49611.76402.83653.7675
H102.26792.26791.08673.10232.49612.95422.49612.95421.76403.76753.9071
H112.19572.19572.70411.08753.06322.49613.06322.49612.83653.76751.7640
H122.26792.26793.10231.08672.49612.95422.49612.95423.76753.90711.7640

picture of cyclobutane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C2 88.532 C1 C3 H9 111.650
C1 C3 H10 117.741 C1 C4 C2 88.532
C1 C4 H11 111.650 C1 C4 H12 117.741
C2 C3 H9 111.650 C2 C3 H10 117.741
C2 C4 H11 111.650 C2 C4 H12 117.741
C3 C1 C4 88.532 C3 C1 H5 111.650
C3 C1 H6 117.741 C3 C2 C4 88.532
C3 C2 H7 111.650 C3 C2 H8 117.741
C4 C1 H5 111.650 C4 C1 H6 117.741
C4 C2 H7 111.650 C4 C2 H8 117.741
H5 C1 H6 108.448 H7 C2 H8 108.448
H9 C3 H10 108.448 H11 C4 H12 108.448
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability