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All results from a given calculation for C2H5CN (ethyl cyanide)

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-170.398805
Energy at 298.15K 
HF Energy-170.004931
Nuclear repulsion energy101.600824
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 MP2/3-21G*
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' 3176 3021 16.01 57.32 0.73 0.84
2 A' 3102 2951 7.31 48.44 0.17 0.29
3 A' 3099 2948 10.40 116.59 0.02 0.04
4 A' 2146 2041 3.52 19.75 0.29 0.45
5 A' 1604 1526 5.93 14.47 0.74 0.85
6 A' 1577 1500 6.44 20.01 0.72 0.84
7 A' 1498 1425 3.34 2.80 0.75 0.86
8 A' 1414 1345 0.88 7.16 0.69 0.82
9 A' 1145 1089 6.28 2.07 0.21 0.35
10 A' 1002 953 0.36 6.93 0.44 0.61
11 A' 827 786 0.12 5.79 0.18 0.31
12 A' 569 541 1.75 1.64 0.33 0.50
13 A' 235 224 2.21 2.18 0.72 0.84
14 A" 3184 3029 15.50 22.29 0.75 0.86
15 A" 3142 2989 1.20 81.34 0.75 0.86
16 A" 1600 1522 7.20 22.96 0.75 0.86
17 A" 1366 1299 0.00 11.55 0.75 0.86
18 A" 1190 1132 0.78 0.24 0.75 0.86
19 A" 834 793 3.98 0.33 0.75 0.86
20 A" 429 408 0.03 2.91 0.75 0.86
21 A" 237 226 0.49 0.36 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16687.0 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 15874.4 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 MP2/3-21G*
ABC
0.90804 0.15287 0.13762

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.534 0.561 0.000
C2 0.000 0.829 0.000
C3 -0.775 -0.426 0.000
N4 -1.388 -1.444 0.000
H5 2.072 1.514 0.000
H6 1.820 -0.007 0.889
H7 1.820 -0.007 -0.889
H8 -0.275 1.415 0.885
H9 -0.275 1.415 -0.885

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.55732.51113.54351.09441.09341.09342.18752.1875
C21.55731.47522.66292.18212.19152.19151.09631.0963
C32.51111.47521.18783.44502.77492.77492.10302.1030
N43.54352.66291.18784.55163.62573.62573.19253.1925
H51.09442.18213.44504.55161.78001.78002.51012.5101
H61.09342.19152.77493.62571.78001.77892.53213.0919
H71.09342.19152.77493.62571.78001.77893.09192.5321
H82.18751.09632.10303.19252.51012.53213.09191.7697
H92.18751.09632.10303.19252.51013.09192.53211.7697

picture of ethyl cyanide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 111.769 C1 C2 H8 109.828
C1 C2 H9 109.828 C2 C1 H5 109.513
C2 C1 H6 110.310 C2 C1 H7 110.310
C2 C3 N4 179.395 C3 C2 H8 108.841
C3 C2 H9 108.841 H5 C1 H6 108.901
H5 C1 H7 108.901 H6 C1 H7 108.874
H8 C2 H9 107.634
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability