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

using model chemistry: HF/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 HF/CEP-31G
 hartrees
Energy at 0K-28.964496
Energy at 298.15K 
HF Energy-28.964496
Nuclear repulsion energy55.420083
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 HF/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' 3314 2987 71.29 78.38 0.70 0.83
2 A' 3263 2942 18.38 171.79 0.07 0.14
3 A' 3226 2908 45.98 134.40 0.02 0.04
4 A' 2502 2255 16.06 56.15 0.17 0.30
5 A' 1640 1478 9.79 6.64 0.75 0.86
6 A' 1628 1467 7.06 23.75 0.75 0.85
7 A' 1567 1412 1.80 3.67 0.08 0.15
8 A' 1490 1343 4.22 3.88 0.68 0.81
9 A' 1205 1086 8.29 6.73 0.31 0.47
10 A' 1098 989 4.53 14.15 0.47 0.64
11 A' 886 799 6.48 10.71 0.17 0.29
12 A' 588 530 2.70 3.30 0.42 0.59
13 A' 237 213 4.31 4.12 0.73 0.84
14 A" 3333 3004 76.54 4.34 0.75 0.86
15 A" 3309 2983 5.47 128.52 0.75 0.86
16 A" 1633 1472 9.68 19.93 0.75 0.86
17 A" 1405 1266 0.57 15.84 0.75 0.86
18 A" 1234 1112 1.61 0.16 0.75 0.86
19 A" 867 782 3.16 0.19 0.75 0.86
20 A" 426 384 0.04 5.43 0.75 0.86
21 A" 232 209 1.02 0.81 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 17540.4 cm-1
Scaled (by 0.9014) Zero Point Vibrational Energy (zpe) 15810.9 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 HF/CEP-31G
ABC
0.92142 0.15330 0.13815

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.528 0.573 0.000
C2 0.000 0.828 0.000
C3 -0.777 -0.444 0.000
N4 -1.376 -1.441 0.000
H5 2.056 1.525 0.000
H6 1.829 0.011 0.882
H7 1.829 0.011 -0.882
H8 -0.291 1.400 0.877
H9 -0.291 1.400 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54892.51963.53331.08871.08811.08812.18252.1825
C21.54891.49132.65342.17042.18872.18871.08701.0870
C32.51961.49131.16213.45022.78902.78902.09942.0994
N43.53332.65341.16214.53533.62723.62723.16443.1644
H51.08872.17043.45024.53531.76651.76652.50872.5087
H61.08812.18872.78903.62721.76651.76412.53463.0854
H71.08812.18872.78903.62721.76651.76413.08542.5346
H82.18251.08702.09943.16442.50872.53463.08541.7548
H92.18251.08702.09943.16442.50873.08542.53461.7548

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 111.927 C1 C2 H8 110.561
C1 C2 H9 110.561 C2 C1 H5 109.508
C2 C1 H6 110.984 C2 C1 H7 110.984
C2 C3 N4 179.578 C3 C2 H8 108.000
C3 C2 H9 108.000 H5 C1 H6 108.491
H5 C1 H7 108.491 H6 C1 H7 108.310
H8 C2 H9 107.640
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.345      
2 C -0.032      
3 C -0.607      
4 N 0.338      
5 H 0.138      
6 H 0.125      
7 H 0.125      
8 H 0.130      
9 H 0.130      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.511 3.679 0.000 4.454
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -28.127 -4.438 0.000
y -4.438 -28.767 0.000
z 0.000 0.000 -24.109
Traceless
 xyz
x -1.689 -4.438 0.000
y -4.438 -2.649 0.000
z 0.000 0.000 4.338
Polar
3z2-r28.676
x2-y20.640
xy-4.438
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.022 1.121 0.000
y 1.121 5.496 0.000
z 0.000 0.000 3.738


<r2> (average value of r2) Å2
<r2> 73.729
(<r2>)1/2 8.587