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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD(T)/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD(T)/cc-pVTZ
 hartrees
Energy at 0K-156.913074
Energy at 298.15K-156.921671
HF Energy-156.150751
Nuclear repulsion energy124.273588
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 QCISD(T)/cc-pVTZ
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' 3234 3068        
2 A' 3159 2997        
3 A' 3143 2981        
4 A' 3095 2936        
5 A' 3025 2869        
6 A' 1521 1443        
7 A' 1506 1429        
8 A' 1432 1358        
9 A' 1394 1323        
10 A' 1235 1172        
11 A' 1214 1152        
12 A' 1055 1001        
13 A' 1005 953        
14 A' 943 895        
15 A' 797 756        
16 A' 773 733        
17 A' 358 339        
18 A" 3220 3055        
19 A" 3136 2975        
20 A" 3097 2938        
21 A" 1499 1422        
22 A" 1473 1397        
23 A" 1201 1139        
24 A" 1148 1089        
25 A" 1113 1056        
26 A" 1073 1018        
27 A" 878 833        
28 A" 822 779        
29 A" 341 323        
30 A" 229 217        

Unscaled Zero Point Vibrational Energy (zpe) 24058.5 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 22821.9 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 QCISD(T)/cc-pVTZ
ABC
0.51847 0.21253 0.18665

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.351 0.410 0.000
C2 -0.891 1.269 0.000
H3 1.290 0.952 0.000
C4 0.351 -0.894 0.757
C5 0.351 -0.894 -0.757
H6 1.258 -1.199 1.263
H7 1.258 -1.199 -1.263
H8 -0.567 -1.177 1.258
H9 -0.567 -1.177 -1.258
H10 -1.785 0.639 0.000
H11 -0.933 1.909 0.885
H12 -0.933 1.909 -0.885

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51021.08411.50851.50852.23752.23752.22332.22332.14852.16282.1628
C21.51022.20402.60712.60713.50753.50752.76932.76931.09361.09301.0930
H31.08412.20402.20572.20572.49482.49483.09233.09233.09102.57662.5766
C41.50852.60712.20571.51491.08172.23551.08292.23252.73663.08573.4934
C51.50852.60712.20571.51492.23551.08172.23251.08292.73663.49343.0857
H62.23753.50752.49481.08172.23552.52641.82453.11203.77253.82064.3669
H72.23753.50752.49482.23551.08172.52643.11201.82453.77254.36693.8206
H82.22332.76933.09231.08292.23251.82453.11202.51582.52273.12923.7745
H92.22332.76933.09232.23251.08293.11201.82452.51582.52273.77453.1292
H102.14851.09363.09102.73662.73663.77253.77252.52272.52271.76691.7669
H112.16281.09302.57663.08573.49343.82064.36693.12923.77451.76691.7707
H122.16281.09302.57663.49343.08574.36693.82063.77453.12921.76691.7707

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.179 C1 C2 H11 111.353
C1 C2 H12 111.353 C1 C4 H5 59.859
C1 C4 H6 118.567 C1 C4 H8 117.228
C1 H5 C4 59.859 C1 H5 H7 118.567
C1 H5 H9 117.228 C2 C1 C3 115.341
C2 C1 C4 119.455 C2 C1 H5 119.455
C3 C1 C4 115.624 C3 C1 H5 115.624
C4 C1 H5 60.281 C4 H5 H7 117.874
C4 H5 H9 117.523 H5 C4 H6 117.874
H5 C4 H8 117.523 H6 C4 H8 114.887
H7 H5 H9 114.887 H10 C2 H11 107.812
H10 C2 H12 107.812 H11 C2 H12 108.191
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability