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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD/cc-pVDZ

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/cc-pVDZ
 hartrees
Energy at 0K-156.727066
Energy at 298.15K-156.735672
HF Energy-156.105811
Nuclear repulsion energy123.316746
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/cc-pVDZ
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' 3254 3122 24.17      
2 A' 3173 3044 15.72      
3 A' 3160 3032 15.03      
4 A' 3129 3002 19.68      
5 A' 3048 2924 33.31      
6 A' 1531 1469 1.06      
7 A' 1497 1437 6.47      
8 A' 1442 1383 1.91      
9 A' 1394 1338 2.83      
10 A' 1240 1190 0.14      
11 A' 1218 1169 0.08      
12 A' 1072 1029 3.27      
13 A' 1013 972 8.83      
14 A' 943 904 1.90      
15 A' 804 772 6.01      
16 A' 775 744 1.22      
17 A' 361 347 0.23      
18 A" 3241 3109 0.21      
19 A" 3152 3024 19.80      
20 A" 3128 3001 29.67      
21 A" 1490 1429 1.56      
22 A" 1465 1405 1.38      
23 A" 1200 1151 0.45      
24 A" 1154 1107 0.18      
25 A" 1114 1069 3.17      
26 A" 1079 1035 0.78      
27 A" 892 856 8.23      
28 A" 821 788 3.68      
29 A" 342 328 0.47      
30 A" 229 220 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24180.3 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 23198.6 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/cc-pVDZ
ABC
0.51219 0.20920 0.18379

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.350 0.409 0.000
C2 -0.890 1.284 0.000
H3 1.302 0.956 0.000
C4 0.350 -0.903 0.761
C5 0.350 -0.903 -0.761
H6 1.267 -1.209 1.276
H7 1.267 -1.209 -1.276
H8 -0.577 -1.193 1.269
H9 -0.577 -1.193 -1.269
H10 -1.804 0.661 0.000
H11 -0.923 1.933 0.895
H12 -0.923 1.933 -0.895

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51761.09801.51681.51682.25542.25542.24422.24422.16882.17802.1780
C21.51762.21652.62682.62683.53493.53492.80052.80051.10611.10601.1060
H31.09802.21652.22312.22312.51332.51333.12423.12423.12012.58982.5898
C41.51682.62682.22311.52131.09542.25421.09652.25002.76873.11143.5220
C51.51682.62682.22311.52132.25421.09542.25001.09652.76873.52203.1114
H62.25543.53492.51331.09542.25422.55141.84453.14273.81533.84864.4023
H72.25543.53492.51332.25421.09542.55143.14271.84453.81534.40233.8486
H82.24422.80053.12421.09652.25001.84453.14272.53762.55973.16673.8172
H92.24422.80053.12422.25001.09653.14271.84452.53762.55973.81723.1667
H102.16881.10613.12012.76872.76873.81533.81532.55972.55971.78711.7871
H112.17801.10602.58983.11143.52203.84864.40233.16673.81721.78711.7905
H122.17801.10602.58983.52203.11144.40233.84863.81723.16671.78711.7905

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.525 C1 C2 H11 111.263
C1 C2 H12 111.263 C1 C4 H5 59.902
C1 C4 H6 118.513 C1 C4 H8 117.456
C1 H5 C4 59.902 C1 H5 H7 118.513
C1 H5 H9 117.456 C2 C1 C3 114.912
C2 C1 C4 119.916 C2 C1 H5 119.916
C3 C1 C4 115.537 C3 C1 H5 115.537
C4 C1 H5 60.197 C4 H5 H7 118.049
C4 H5 H9 117.610 H5 C4 H6 118.049
H5 C4 H8 117.610 H6 C4 H8 114.607
H7 H5 H9 114.607 H10 C2 H11 107.778
H10 C2 H12 107.778 H11 C2 H12 108.086
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability