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

using model chemistry: MP2/CEP-121G*

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-121G*
 hartrees
Energy at 0K-29.607156
Energy at 298.15K 
HF Energy-29.055608
Nuclear repulsion energy55.258628
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-121G*
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' 3184 3034 21.92 68.93 0.72 0.84
2 A' 3103 2957 9.74 116.22 0.07 0.14
3 A' 3083 2937 20.39 123.53 0.01 0.02
4 A' 2145 2044 0.41 45.43 0.21 0.34
5 A' 1541 1468 7.20 5.21 0.75 0.86
6 A' 1518 1447 4.80 14.62 0.75 0.86
7 A' 1453 1384 2.31 2.18 0.15 0.26
8 A' 1374 1309 2.95 2.71 0.57 0.73
9 A' 1111 1058 3.77 4.50 0.16 0.27
10 A' 1031 982 1.24 6.47 0.50 0.66
11 A' 840 800 0.47 6.35 0.12 0.22
12 A' 526 501 1.13 1.77 0.26 0.42
13 A' 199 190 3.17 2.70 0.74 0.85
14 A" 3193 3042 21.93 19.76 0.75 0.86
15 A" 3160 3011 1.02 94.50 0.75 0.86
16 A" 1537 1465 8.39 11.58 0.75 0.86
17 A" 1306 1245 0.05 6.59 0.75 0.86
18 A" 1136 1082 0.57 0.33 0.75 0.86
19 A" 792 755 2.01 0.23 0.75 0.86
20 A" 361 344 0.00 2.54 0.75 0.86
21 A" 225 215 0.68 0.88 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16408.2 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 15633.7 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-121G*
ABC
0.90638 0.15392 0.13841

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.520 0.569 0.000
C2 0.000 0.834 0.000
C3 -0.773 -0.429 0.000
N4 -1.368 -1.455 0.000
H5 2.059 1.521 0.000
H6 1.811 0.001 0.887
H7 1.811 0.001 -0.887
H8 -0.295 1.409 0.884
H9 -0.295 1.409 -0.884

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54302.50103.52661.09401.09311.09312.18652.1865
C21.54301.48122.66712.17072.18232.18231.09491.0949
C32.50101.48121.18613.43882.76632.76632.09482.0948
N43.52662.66711.18614.53903.60773.60773.18383.1838
H51.09402.17073.43884.53901.77731.77732.51722.5172
H61.09312.18232.76633.60771.77731.77502.53343.0913
H71.09312.18232.76633.60771.77731.77503.09132.5334
H82.18651.09492.09483.18382.51722.53343.09131.7682
H92.18651.09492.09483.18382.51723.09132.53341.7682

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 111.567 C1 C2 H8 110.829
C1 C2 H9 110.829 C2 C1 H5 109.635
C2 C1 H6 110.598 C2 C1 H7 110.598
C2 C3 N4 178.615 C3 C2 H8 107.880
C3 C2 H9 107.880 H5 C1 H6 108.700
H5 C1 H7 108.700 H6 C1 H7 108.559
H8 C2 H9 107.698
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability