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All results from a given calculation for C4H8 (methylcyclopropane)

using model chemistry: QCISD/3-21G*

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/3-21G*
 hartrees
Energy at 0K-155.632181
Energy at 298.15K-155.640792
HF Energy-155.220976
Nuclear repulsion energy122.796329
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/3-21G*
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 3108 20.43      
2 A' 3161 3038 10.23      
3 A' 3144 3022 8.79      
4 A' 3074 2955 22.25      
5 A' 3015 2898 23.57      
6 A' 1579 1518 6.15      
7 A' 1551 1491 2.14      
8 A' 1480 1423 3.93      
9 A' 1418 1362 1.09      
10 A' 1249 1201 0.13      
11 A' 1181 1135 0.13      
12 A' 1121 1077 18.65      
13 A' 1001 962 0.08      
14 A' 941 904 6.80      
15 A' 813 782 0.54      
16 A' 750 721 6.87      
17 A' 371 357 0.15      
18 A" 3218 3093 0.15      
19 A" 3138 3016 15.46      
20 A" 3077 2957 27.33      
21 A" 1572 1511 1.69      
22 A" 1533 1473 2.89      
23 A" 1226 1178 0.48      
24 A" 1202 1155 0.52      
25 A" 1151 1107 7.28      
26 A" 1134 1089 0.43      
27 A" 869 836 0.91      
28 A" 828 796 11.70      
29 A" 351 338 1.02      
30 A" 219 211 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24299.8 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 23354.6 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/3-21G*
ABC
0.50376 0.20769 0.18213

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.357 0.421 0.000
C2 -0.907 1.280 0.000
H3 1.294 0.976 0.000
C4 0.357 -0.906 0.770
C5 0.357 -0.906 -0.770
H6 1.270 -1.208 1.278
H7 1.270 -1.208 -1.278
H8 -0.564 -1.188 1.275
H9 -0.564 -1.188 -1.275
H10 -1.801 0.637 0.000
H11 -0.945 1.921 0.893
H12 -0.945 1.921 -0.893

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.52851.08901.53431.53432.26282.26282.25032.25032.16892.17842.1784
C21.52852.22232.64002.64003.54443.54442.79892.79891.10101.10031.1003
H31.08902.22232.23892.23892.53062.53063.12453.12453.11362.58972.5897
C41.53432.64002.23891.54101.08722.26321.08792.26142.76243.11523.5295
C51.53432.64002.23891.54102.26321.08722.26141.08792.76243.52953.1152
H62.26283.54442.53061.08722.26322.55671.83423.14413.80353.85324.4062
H72.26283.54442.53062.26321.08722.55673.14411.83423.80354.40623.8532
H82.25032.79893.12451.08792.26141.83423.14412.55062.54663.15573.8098
H92.25032.79893.12452.26141.08793.14411.83422.55062.54663.80983.1557
H102.16891.10103.11362.76242.76243.80353.80352.54662.54661.78321.7832
H112.17841.10032.58973.11523.52953.85324.40623.15573.80981.78321.7864
H122.17841.10032.58973.52953.11524.40623.85323.80983.15571.78321.7864

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.075 C1 C2 H11 110.866
C1 C2 H12 110.866 C1 C4 H5 59.856
C1 C4 H6 118.348 C1 C4 H8 117.205
C1 H5 C4 59.856 C1 H5 H7 118.348
C1 H5 H9 117.205 C2 C1 C3 115.173
C2 C1 C4 119.074 C2 C1 H5 119.074
C3 C1 C4 116.148 C3 C1 H5 116.148
C4 C1 H5 60.288 C4 H5 H7 117.849
C4 H5 H9 117.647 H5 C4 H6 117.849
H5 C4 H8 117.647 H6 C4 H8 114.976
H7 H5 H9 114.976 H10 C2 H11 108.205
H10 C2 H12 108.205 H11 C2 H12 108.537
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability