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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD/TZVP

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/TZVP
 hartrees
Energy at 0K-156.791020
Energy at 298.15K-156.799692
HF Energy-156.145634
Nuclear repulsion energy124.335905
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/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 A' 3258 3113 28.73      
2 A' 3182 3040 17.00      
3 A' 3167 3026 12.58      
4 A' 3120 2981 25.04      
5 A' 3049 2913 33.34      
6 A' 1550 1481 1.02      
7 A' 1531 1462 6.85      
8 A' 1459 1394 2.75      
9 A' 1422 1358 2.33      
10 A' 1257 1201 0.07      
11 A' 1235 1180 0.11      
12 A' 1106 1057 7.88      
13 A' 1018 972 7.22      
14 A' 965 922 2.38      
15 A' 817 780 2.23      
16 A' 787 752 5.86      
17 A' 373 357 0.26      
18 A" 3244 3099 0.27      
19 A" 3161 3019 22.99      
20 A" 3120 2980 33.22      
21 A" 1520 1452 1.43      
22 A" 1501 1434 1.57      
23 A" 1231 1176 0.63      
24 A" 1186 1133 0.01      
25 A" 1139 1088 3.29      
26 A" 1117 1067 0.69      
27 A" 889 850 9.65      
28 A" 854 816 5.27      
29 A" 353 338 0.50      
30 A" 221 211 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24415.8 cm-1
Scaled (by 0.9553) Zero Point Vibrational Energy (zpe) 23324.4 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 QCISD/TZVP
ABC
0.52101 0.21221 0.18644

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.349 0.405 0.000
C2 -0.886 1.276 0.000
H3 1.289 0.947 0.000
C4 0.349 -0.896 0.755
C5 0.349 -0.896 -0.755
H6 1.255 -1.200 1.262
H7 1.255 -1.200 -1.262
H8 -0.568 -1.183 1.256
H9 -0.568 -1.183 -1.256
H10 -1.788 0.657 0.000
H11 -0.918 1.916 0.886
H12 -0.918 1.916 -0.886

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51071.08461.50501.50502.23462.23462.22292.22292.15112.16112.1611
C21.51072.19962.61012.61013.50853.50852.77922.77921.09371.09351.0935
H31.08462.19962.20232.20232.49072.49073.09213.09213.09002.56752.5675
C41.50502.61012.20231.51101.08212.23271.08322.22882.74703.08703.4938
C51.50502.61012.20231.51102.23271.08212.22881.08322.74703.49383.0870
H62.23463.50852.49071.08212.23272.52421.82363.10873.78163.81774.3643
H72.23463.50852.49072.23271.08212.52423.10871.82363.78164.36433.8177
H82.22292.77923.09211.08322.22881.82363.10872.51122.53943.14083.7833
H92.22292.77923.09212.22881.08323.10871.82362.51122.53943.78333.1408
H102.15111.09373.09002.74702.74703.78163.78162.53942.53941.76871.7687
H112.16111.09352.56753.08703.49383.81774.36433.14083.78331.76871.7717
H122.16111.09352.56753.49383.08704.36433.81773.78333.14081.76871.7717

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.349 C1 C2 H11 111.149
C1 C2 H12 111.149 C1 C4 H5 59.869
C1 C4 H6 118.565 C1 C4 H8 117.448
C1 H5 C4 59.869 C1 H5 H7 118.565
C1 H5 H9 117.448 C2 C1 C3 114.897
C2 C1 C4 119.882 C2 C1 H5 119.882
C3 C1 C4 115.564 C3 C1 H5 115.564
C4 C1 H5 60.262 C4 H5 H7 117.916
C4 H5 H9 117.496 H5 C4 H6 117.916
H5 C4 H8 117.496 H6 C4 H8 114.741
H7 H5 H9 114.741 H10 C2 H11 107.928
H10 C2 H12 107.928 H11 C2 H12 108.211
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability