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

using model chemistry: MP2/CEP-31G*

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/CEP-31G*
 hartrees
Energy at 0K-29.558478
Energy at 298.15K 
HF Energy-29.039969
Nuclear repulsion energy54.842023
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/CEP-31G*
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' 3203 3041 25.72 62.28 0.73 0.85
2 A' 3124 2966 12.25 115.51 0.07 0.13
3 A' 3102 2945 23.25 122.20 0.02 0.04
4 A' 2175 2065 0.06 39.50 0.23 0.37
5 A' 1529 1451 6.82 6.30 0.75 0.86
6 A' 1509 1432 4.57 15.63 0.74 0.85
7 A' 1448 1375 1.77 4.19 0.10 0.18
8 A' 1372 1303 4.04 2.72 0.75 0.86
9 A' 1116 1059 4.76 6.47 0.26 0.42
10 A' 1039 987 1.28 7.02 0.51 0.68
11 A' 847 804 0.33 7.02 0.14 0.25
12 A' 524 498 1.60 1.60 0.34 0.50
13 A' 201 191 2.79 2.83 0.73 0.85
14 A" 3213 3051 30.34 9.46 0.75 0.86
15 A" 3190 3028 0.31 92.57 0.75 0.86
16 A" 1525 1448 8.13 14.87 0.75 0.86
17 A" 1313 1247 0.04 11.20 0.75 0.86
18 A" 1136 1078 1.23 0.08 0.75 0.86
19 A" 797 757 3.35 0.12 0.75 0.86
20 A" 362 343 0.01 2.17 0.75 0.86
21 A" 223 212 0.66 0.84 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16472.9 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 15639.3 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/CEP-31G*
ABC
0.89222 0.15185 0.13653

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.527 0.575 0.000
C2 0.000 0.843 0.000
C3 -0.775 -0.431 0.000
N4 -1.374 -1.471 0.000
H5 2.069 1.536 0.000
H6 1.820 0.002 0.895
H7 1.820 0.002 -0.895
H8 -0.299 1.419 0.892
H9 -0.299 1.419 -0.892

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.55012.51253.55041.10351.10261.10262.19972.1997
C21.55011.49122.69152.18212.19582.19581.10281.1028
C32.51251.49121.20053.45842.77972.77972.10802.1080
N43.55042.69151.20054.57203.63023.63023.21013.2101
H51.10352.18213.45844.57201.79361.79362.53272.5327
H61.10262.19582.77973.63021.79361.79012.54883.1128
H71.10262.19582.77973.63021.79361.79013.11282.5488
H82.19971.10282.10803.21012.53272.54883.11281.7836
H92.19971.10282.10803.21012.53273.11282.54881.7836

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 111.391 C1 C2 H8 110.908
C1 C2 H9 110.908 C2 C1 H5 109.483
C2 C1 H6 110.607 C2 C1 H7 110.607
C2 C3 N4 178.599 C3 C2 H8 107.772
C3 C2 H9 107.772 H5 C1 H6 108.780
H5 C1 H7 108.780 H6 C1 H7 108.537
H8 C2 H9 107.938
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability