return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: B3PW91/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at B3PW91/STO-3G
 hartrees
Energy at 0K-169.874411
Energy at 298.15K 
HF Energy-169.874411
Nuclear repulsion energy100.887556
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 B3PW91/STO-3G
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' 3516 3111 0.03 32.23 0.73 0.84
2 A' 3347 2962 0.61 15.20 0.26 0.41
3 A' 3343 2958 0.28 71.32 0.02 0.05
4 A' 2412 2135 8.28 20.12 0.24 0.39
5 A' 1683 1489 4.79 9.08 0.74 0.85
6 A' 1631 1443 3.22 20.08 0.74 0.85
7 A' 1570 1390 0.54 3.89 0.75 0.86
8 A' 1460 1292 4.26 6.50 0.68 0.81
9 A' 1182 1046 4.87 3.16 0.25 0.40
10 A' 1099 973 1.31 4.94 0.57 0.73
11 A' 882 781 0.08 3.49 0.21 0.34
12 A' 551 488 1.22 0.88 0.34 0.50
13 A' 217 192 2.06 1.60 0.73 0.84
14 A" 3520 3115 0.00 17.74 0.75 0.86
15 A" 3446 3050 1.08 39.69 0.75 0.86
16 A" 1676 1483 5.08 17.24 0.75 0.86
17 A" 1381 1222 0.03 11.22 0.75 0.86
18 A" 1199 1061 0.29 0.57 0.75 0.86
19 A" 852 754 6.88 0.21 0.75 0.86
20 A" 386 341 0.18 1.71 0.75 0.86
21 A" 213 188 0.48 0.26 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 17781.8 cm-1
Scaled (by 0.885) Zero Point Vibrational Energy (zpe) 15736.9 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 B3PW91/STO-3G
ABC
0.90924 0.14978 0.13522

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/STO-3G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.536 0.590 0.000
C2 0.000 0.833 0.000
C3 -0.776 -0.446 0.000
N4 -1.387 -1.473 0.000
H5 2.058 1.558 0.000
H6 1.838 0.026 0.893
H7 1.838 0.026 -0.893
H8 -0.292 1.419 0.892
H9 -0.292 1.419 -0.892

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.55482.53363.57751.09951.09911.09912.19612.1961
C21.55481.49642.69082.18222.19722.19721.10621.1062
C32.53361.49641.19453.47132.80242.80242.12322.1232
N43.57752.69081.19454.58853.66643.66643.21783.2178
H51.09952.18223.47134.58851.78711.78712.51792.5179
H61.09912.19722.80243.66641.78711.78642.54513.1087
H71.09912.19722.80243.66641.78711.78643.10872.5451
H82.19611.10622.12323.21782.51792.54513.10871.7838
H92.19611.10622.12323.21782.51793.10872.54511.7838

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 112.258 C1 C2 H8 110.091
C1 C2 H9 110.091 C2 C1 H5 109.397
C2 C1 H6 110.596 C2 C1 H7 110.596
C2 C3 N4 179.520 C3 C2 H8 108.399
C3 C2 H9 108.399 H5 C1 H6 108.745
H5 C1 H7 108.745 H6 C1 H7 108.715
H8 C2 H9 107.462
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.223      
2 C -0.143      
3 C 0.061      
4 N -0.189      
5 H 0.090      
6 H 0.092      
7 H 0.092      
8 H 0.110      
9 H 0.110      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.761 2.608 0.000 3.147
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -24.799 -3.124 0.000
y -3.124 -25.346 0.000
z 0.000 0.000 -22.084
Traceless
 xyz
x -1.084 -3.124 0.000
y -3.124 -1.904 0.000
z 0.000 0.000 2.988
Polar
3z2-r25.976
x2-y20.547
xy-3.124
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.740 0.918 0.000
y 0.918 3.328 0.000
z 0.000 0.000 1.968


<r2> (average value of r2) Å2
<r2> 89.704
(<r2>)1/2 9.471