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 CH2CHCH2CH2CH3 (1-pentene)

using model chemistry: CCD/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 2 yes C1 1A

Conformer 1 (C1)

Jump to S1C2
Vibrational Frequencies calculated at CCD/6-31G(2df,p)
Rotational Constants (cm-1) from geometry optimized at CCD/6-31G(2df,p)
See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-31G(2df,p)
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C1)

Jump to S1C1
Energy calculated at CCD/6-31G(2df,p)
 hartrees
Energy at 0K-196.028103
Energy at 298.15K-196.038437
HF Energy-195.165543
Nuclear repulsion energy173.595090
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 CCD/6-31G(2df,p)
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 3286 3112 11.76      
2 A 3201 3032 2.94      
3 A 3187 3018 18.62      
4 A 3184 3015 25.92      
5 A 3172 3005 28.16      
6 A 3137 2971 21.61      
7 A 3128 2962 16.99      
8 A 3094 2931 14.89      
9 A 3090 2927 25.38      
10 A 3080 2917 19.29      
11 A 1745 1653 4.15      
12 A 1543 1462 2.42      
13 A 1535 1454 8.19      
14 A 1527 1447 0.40      
15 A 1518 1438 4.33      
16 A 1482 1404 1.56      
17 A 1450 1373 4.80      
18 A 1405 1331 2.58      
19 A 1385 1312 1.02      
20 A 1345 1274 1.29      
21 A 1314 1245 0.21      
22 A 1283 1215 1.27      
23 A 1216 1152 0.33      
24 A 1122 1063 3.04      
25 A 1099 1041 3.07      
26 A 1053 997 9.65      
27 A 1029 975 1.28      
28 A 967 916 33.75      
29 A 953 902 0.35      
30 A 901 853 0.21      
31 A 885 838 1.53      
32 A 786 744 3.14      
33 A 654 620 6.78      
34 A 437 414 0.36      
35 A 395 375 1.35      
36 A 301 286 0.16      
37 A 231 218 0.06      
38 A 122 116 0.02      
39 A 93 88 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 30666.6 cm-1
Scaled (by 0.9472) Zero Point Vibrational Energy (zpe) 29047.4 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 CCD/6-31G(2df,p)
ABC
0.30076 0.10149 0.08608

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.084 0.569 0.120
C2 -1.177 -0.254 -0.401
C3 -0.061 -0.909 0.367
C4 1.328 -0.518 -0.162
C5 1.636 0.968 0.024
H6 -2.866 1.013 -0.485
H7 -2.079 0.825 1.174
H8 -1.216 -0.483 -1.464
H9 -0.171 -1.997 0.302
H10 -0.140 -0.644 1.426
H11 2.085 -1.118 0.352
H12 1.395 -0.780 -1.223
H13 2.628 1.217 -0.359
H14 0.905 1.590 -0.496
H15 1.608 1.240 1.083

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15
C11.33142.51783.59283.74331.08301.08462.09023.20612.63784.50393.96584.78083.21793.8741
C21.33141.50432.53033.09672.11302.11111.08832.13132.13653.45742.75064.07982.78253.4911
C32.51781.50431.53712.55403.50502.77972.20661.09571.09482.15652.16003.50442.81432.8135
C43.59282.53031.53711.52954.47643.89802.85852.15652.16671.09391.09522.17752.17602.1724
C53.74333.09672.55401.52954.53093.89153.52943.48402.77872.15902.16101.09191.09171.0934
H61.08302.11303.50504.47644.53091.84552.43244.11583.71835.45454.68085.49893.81424.7455
H71.08462.11112.77973.89803.89151.84553.06783.51592.44504.66754.51494.96553.50313.7108
H82.09021.08832.20662.85853.52942.43243.06782.55033.08843.82122.63874.34623.11944.1748
H93.20612.13131.09572.15653.48404.11583.51592.55031.75982.42212.50214.31363.82883.7755
H102.63782.13651.09482.16672.77873.71832.44503.08841.75982.51613.06513.78353.12642.5927
H114.50393.45742.15651.09392.15905.45454.66753.82122.42212.51611.75312.50103.07312.5144
H123.96582.75062.16001.09522.16104.68084.51492.63872.50213.06511.75312.50142.52673.0730
H134.78084.07983.50442.17751.09195.49894.96554.34624.31363.78352.50102.50141.76831.7665
H143.21792.78252.81432.17601.09173.81423.50313.11943.82883.12643.07312.52671.76831.7629
H153.87413.49112.81352.17241.09344.74553.71084.17483.77552.59272.51443.07301.76651.7629

picture of 1-pentene state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 125.112 C1 C2 H8 119.154
C2 C1 H6 121.797 C2 C1 H7 121.472
C2 C3 C4 112.591 C2 C3 H9 109.108
C2 C3 H10 109.566 C3 C2 H8 115.732
C3 C4 C5 112.783 C3 C4 H11 108.929
C3 C4 H12 109.128 C4 C3 H9 108.828
C4 C3 H10 109.672 C4 C5 H13 111.233
C4 C5 H14 111.124 C4 C5 H15 110.742
C5 C4 H11 109.646 C5 C4 H12 109.732
H6 C1 H7 116.731 H9 C3 H10 106.910
H11 C4 H12 106.419 H13 C5 H14 108.155
H13 C5 H15 107.872 H14 C5 H15 107.565
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability