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

using model chemistry: MP2=FULL/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=FULL/3-21G
 hartrees
Energy at 0K-170.405416
Energy at 298.15K 
HF Energy-170.004978
Nuclear repulsion energy101.616553
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/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 3033 15.92 57.29 0.73 0.84
2 A' 3103 2962 7.43 46.47 0.18 0.30
3 A' 3100 2960 10.20 118.45 0.02 0.04
4 A' 2146 2049 3.51 19.77 0.29 0.45
5 A' 1604 1532 5.95 14.48 0.74 0.85
6 A' 1576 1505 6.47 19.98 0.72 0.84
7 A' 1499 1431 3.38 2.80 0.75 0.86
8 A' 1414 1350 0.88 7.16 0.70 0.82
9 A' 1145 1093 6.29 2.06 0.21 0.35
10 A' 1002 957 0.36 6.92 0.43 0.61
11 A' 827 789 0.11 5.78 0.18 0.31
12 A' 569 543 1.75 1.64 0.34 0.50
13 A' 235 225 2.21 2.18 0.72 0.84
14 A" 3185 3041 15.39 22.37 0.75 0.86
15 A" 3142 3000 1.20 81.17 0.75 0.86
16 A" 1600 1528 7.23 22.95 0.75 0.86
17 A" 1366 1304 0.00 11.54 0.75 0.86
18 A" 1190 1136 0.78 0.24 0.75 0.86
19 A" 834 796 4.00 0.33 0.75 0.86
20 A" 429 410 0.03 2.91 0.75 0.86
21 A" 237 227 0.48 0.37 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16688.8 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 15934.5 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/3-21G
ABC
0.90835 0.15292 0.13766

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.534 0.560 0.000
C2 0.000 0.829 0.000
C3 -0.775 -0.426 0.000
N4 -1.388 -1.443 0.000
H5 2.072 1.513 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
C11.55702.51053.54291.09421.09321.09322.18722.1872
C21.55701.47492.66252.18182.19122.19121.09611.0961
C32.51051.47491.18773.44442.77442.77442.10272.1027
N43.54292.66251.18774.55103.62523.62523.19213.1921
H51.09422.18183.44444.55101.77971.77972.50982.5098
H61.09322.19122.77443.62521.77971.77862.53183.0914
H71.09322.19122.77443.62521.77971.77863.09142.5318
H82.18721.09612.10273.19212.50982.53183.09141.7694
H92.18721.09612.10273.19212.50983.09142.53181.7694

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 111.766 C1 C2 H8 109.827
C1 C2 H9 109.827 C2 C1 H5 109.523
C2 C1 H6 110.312 C2 C1 H7 110.312
C2 C3 N4 179.404 C3 C2 H8 108.846
C3 C2 H9 108.846 H5 C1 H6 108.896
H5 C1 H7 108.896 H6 C1 H7 108.868
H8 C2 H9 107.628
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability