return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: MP2=FULL/aug-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 MP2=FULL/aug-cc-pVDZ
 hartrees
Energy at 0K-156.713424
Energy at 298.15K-156.722007
HF Energy-156.111273
Nuclear repulsion energy123.695406
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 MP2=FULL/aug-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' 3282 3181 18.20      
2 A' 3196 3098 14.21      
3 A' 3177 3079 8.89      
4 A' 3144 3047 20.34      
5 A' 3054 2960 31.71      
6 A' 1511 1464 1.14      
7 A' 1494 1448 8.19      
8 A' 1420 1376 3.21      
9 A' 1380 1338 2.31      
10 A' 1235 1197 0.06      
11 A' 1211 1174 0.18      
12 A' 1028 996 3.87      
13 A' 1007 976 14.17      
14 A' 936 907 1.49      
15 A' 797 773 6.54      
16 A' 768 744 1.04      
17 A' 361 350 0.22      
18 A" 3269 3168 0.18      
19 A" 3170 3072 17.30      
20 A" 3146 3049 25.18      
21 A" 1481 1436 1.96      
22 A" 1457 1413 2.15      
23 A" 1184 1148 0.76      
24 A" 1126 1091 0.01      
25 A" 1103 1069 3.22      
26 A" 1042 1010 1.18      
27 A" 880 853 10.04      
28 A" 808 783 3.81      
29 A" 342 332 0.52      
30 A" 231 224 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24120.4 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 23377.5 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 MP2=FULL/aug-cc-pVDZ
ABC
0.51234 0.21127 0.18554

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.353 0.414 0.000
C2 -0.895 1.269 0.000
H3 1.300 0.959 0.000
C4 0.353 -0.896 0.761
C5 0.353 -0.896 -0.761
H6 1.268 -1.203 1.269
H7 1.268 -1.203 -1.269
H8 -0.573 -1.179 1.265
H9 -0.573 -1.179 -1.265
H10 -1.793 0.631 0.000
H11 -0.939 1.914 0.892
H12 -0.939 1.914 -0.892

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.51301.09331.51521.51522.25002.25002.23522.23522.15692.17122.1712
C21.51302.21732.61272.61273.52163.52162.77482.77481.10171.10141.1014
H31.09332.21732.21812.21812.50752.50753.11203.11203.11092.59262.5926
C41.51522.61272.21811.52271.09042.24811.09162.24572.74173.09533.5068
C51.51522.61272.21811.52272.24811.09042.24571.09162.74173.50683.0953
H62.25003.52162.50751.09042.24812.53811.84143.13213.78733.83754.3881
H72.25003.52162.50752.24811.09042.53813.13211.84143.78734.38813.8375
H82.23522.77483.11201.09162.24571.84143.13212.52932.52283.13693.7885
H92.23522.77483.11202.24571.09163.13211.84142.52932.52283.78853.1369
H102.15691.10173.11092.74172.74173.78733.78732.52282.52281.78071.7807
H112.17121.10142.59263.09533.50683.83754.38813.13693.78851.78071.7844
H122.17121.10142.59263.50683.09534.38813.83753.78853.13691.78071.7844

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.162 C1 C2 H11 111.318
C1 C2 H12 111.318 C1 C4 H5 59.836
C1 C4 H6 118.521 C1 C4 H8 117.131
C1 H5 C4 59.836 C1 H5 H7 118.521
C1 H5 H9 117.131 C2 C1 C3 115.647
C2 C1 C4 119.268 C2 C1 H5 119.268
C3 C1 C4 115.546 C3 C1 H5 115.546
C4 C1 H5 60.329 C4 H5 H7 117.749
C4 H5 H9 117.455 H5 C4 H6 117.749
H5 C4 H8 117.455 H6 C4 H8 115.098
H7 H5 H9 115.098 H10 C2 H11 107.853
H10 C2 H12 107.853 H11 C2 H12 108.199
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability