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: B3LYP/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at B3LYP/6-31G
 hartrees
Energy at 0K-172.018474
Energy at 298.15K 
HF Energy-172.018474
Nuclear repulsion energy102.173400
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 B3LYP/6-31G
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' 3142 3022 23.20 75.74 0.71 0.83
2 A' 3061 2945 21.12 100.46 0.01 0.02
3 A' 3052 2936 8.37 120.78 0.08 0.14
4 A' 2316 2228 7.57 54.62 0.29 0.45
5 A' 1549 1491 8.38 12.58 0.74 0.85
6 A' 1524 1466 7.34 22.96 0.70 0.83
7 A' 1465 1409 2.58 2.50 0.74 0.85
8 A' 1382 1330 1.76 8.79 0.65 0.79
9 A' 1120 1078 7.48 2.40 0.18 0.30
10 A' 1029 990 0.43 7.23 0.42 0.59
11 A' 846 814 0.21 5.81 0.20 0.33
12 A' 548 527 1.77 2.25 0.39 0.57
13 A' 213 205 3.05 3.53 0.73 0.85
14 A" 3147 3028 23.05 31.37 0.75 0.86
15 A" 3089 2971 3.02 96.34 0.75 0.86
16 A" 1542 1484 9.10 22.91 0.75 0.86
17 A" 1315 1265 0.01 11.15 0.75 0.86
18 A" 1151 1107 0.68 0.08 0.75 0.86
19 A" 821 790 4.89 0.44 0.75 0.86
20 A" 385 370 0.00 4.28 0.75 0.86
21 A" 223 214 0.77 0.74 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16460.2 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 15834.7 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 B3LYP/6-31G
ABC
0.92934 0.15389 0.13887

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.526 0.570 0.000
C2 0.000 0.813 0.000
C3 -0.774 -0.432 0.000
N4 -1.379 -1.436 0.000
H5 2.053 1.529 0.000
H6 1.833 0.007 0.887
H7 1.833 0.007 -0.887
H8 -0.288 1.403 0.880
H9 -0.288 1.403 -0.880

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54472.50833.53021.09481.09431.09432.18062.1806
C21.54471.46612.63812.17482.18962.18961.09761.0976
C32.50831.46611.17213.44112.78812.78812.09242.0924
N43.53022.63811.17214.53613.63123.63123.16613.1661
H51.09482.17483.44114.53611.77531.77532.50412.5041
H61.09432.18962.78813.63121.77531.77332.53853.0926
H71.09432.18962.78813.63121.77531.77333.09262.5385
H82.18061.09762.09243.16612.50412.53853.09261.7596
H92.18061.09762.09243.16612.50413.09262.53851.7596

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 112.817 C1 C2 H8 110.076
C1 C2 H9 110.076 C2 C1 H5 109.788
C2 C1 H6 110.985 C2 C1 H7 110.985
C2 C3 N4 179.242 C3 C2 H8 108.552
C3 C2 H9 108.552 H5 C1 H6 108.381
H5 C1 H7 108.381 H6 C1 H7 108.236
H8 C2 H9 106.555
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.401      
2 C -0.305      
3 C 0.125      
4 N -0.273      
5 H 0.151      
6 H 0.162      
7 H 0.162      
8 H 0.190      
9 H 0.190      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.255 3.272 0.000 3.973
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -27.059 -3.960 0.000
y -3.960 -27.753 0.000
z 0.000 0.000 -23.741
Traceless
 xyz
x -1.312 -3.960 0.000
y -3.960 -2.353 0.000
z 0.000 0.000 3.665
Polar
3z2-r27.329
x2-y20.694
xy-3.960
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.102 1.281 0.000
y 1.281 5.750 0.000
z 0.000 0.000 3.869


<r2> (average value of r2) Å2
<r2> 89.192
(<r2>)1/2 9.444