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return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for (Isobutane)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at CBS-Q
 hartrees
Energy at 0K-158.083486
Energy at 298.15K-158.076771
HF Energy-157.297592
Nuclear repulsion energy134.598450
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
4/u)
Dep P Dep U
1 A1 3251 3251 148.16      
2 A1 3184 3184 9.90      
3 A1 3170 3170 22.63      
4 A1 1651 1651 12.51      
5 A1 1567 1567 2.51      
6 A1 1316 1316 0.05      
7 A1 846 846 0.34      
8 A1 461 461 0.11      
9 A2 3244 3244 0.00      
10 A2 1619 1619 0.00      
11 A2 1035 1035 0.00      
12 A2 226 226 0.00      
13 E 3251 3251 83.64      
13 E 3251 3251 83.64      
14 E 3237 3237 5.83      
14 E 3237 3237 5.83      
15 E 3174 3174 41.38      
15 E 3174 3174 41.38      
16 E 1644 1644 2.11      
16 E 1644 1644 2.11      
17 E 1625 1625 0.24      
17 E 1625 1625 0.24      
18 E 1546 1546 5.43      
18 E 1546 1546 5.43      
19 E 1484 1484 2.86      
19 E 1484 1484 2.86      
20 E 1292 1292 2.10      
20 E 1292 1292 2.10      
21 E 1043 1043 0.01      
21 E 1043 1043 0.01      
22 E 998 998 0.65      
22 E 998 998 0.65      
23 E 389 389 0.01      
23 E 389 389 0.01      
24 E 278 278 0.00      
24 E 278 278 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 30746.2 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 30746.2 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
0.25948 0.25948 0.15062

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.373
H2 0.000 0.000 1.464
C3 0.000 1.458 -0.096
C4 1.263 -0.729 -0.096
C5 -1.263 -0.729 -0.096
H6 0.000 1.518 -1.185
H7 1.315 -0.759 -1.185
H8 -1.315 -0.759 -1.185
H9 0.879 1.990 0.264
H10 -0.879 1.990 0.264
H11 1.283 -1.757 0.264
H12 2.163 -0.233 0.264
H13 -2.163 -0.233 0.264
H14 -1.283 -1.757 0.264

Atom - Atom Distances (Å)
  C1 H2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13 H14
C11.09121.53221.53221.53222.17532.17532.17532.17822.17822.17822.17822.17822.1782
H21.09122.13612.13612.13613.05333.05333.05332.48482.48482.48482.48482.48482.4848
C31.53222.13612.52622.52621.09002.79842.79841.08871.08873.48042.76942.76943.4804
C41.53222.13612.52622.52622.79841.09002.79842.76943.48041.08871.08873.48042.7694
C51.53222.13612.52622.52622.79842.79841.09003.48042.76942.76943.48041.08871.0887
H62.17533.05331.09002.79842.79842.62962.62961.75881.75883.80383.13743.13743.8038
H72.17533.05332.79841.09002.79842.62962.62963.13743.80381.75881.75883.80383.1374
H82.17533.05332.79842.79841.09002.62962.62963.80383.13743.13743.80381.75881.7588
H92.17822.48481.08872.76943.48041.75883.13743.80381.75893.76802.56693.76804.3258
H102.17822.48481.08873.48042.76941.75883.80383.13741.75894.32583.76802.56693.7680
H112.17822.48483.48041.08872.76943.80381.75883.13743.76804.32581.75893.76802.5669
H122.17822.48482.76941.08873.48043.13741.75883.80382.56693.76801.75894.32583.7680
H132.17822.48482.76943.48041.08873.13743.80381.75883.76802.56693.76804.32581.7589
H142.17822.48483.48042.76941.08873.80383.13741.75884.32583.76802.56693.76801.7589

picture of Isobutane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 H6 110.989 C1 C3 H9 111.296
C1 C3 H10 111.296 C1 C4 H7 110.989
C1 C4 H11 111.296 C1 C4 H12 111.296
C1 C5 H8 110.989 C1 C5 H13 111.296
C1 C5 H14 111.296 H2 C1 C3 107.847
H2 C1 C4 107.847 H2 C1 C5 107.847
C3 C1 C4 111.045 C3 C1 C5 111.045
C4 C1 C5 111.046 H6 C3 H9 107.662
H6 C3 H10 107.662 H7 C4 H11 107.662
H7 C4 H12 107.663 H8 C5 H13 107.663
H8 C5 H14 107.662 H9 C3 H10 107.760
H11 C4 H12 107.760 H13 C5 H14 107.760
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability