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: PBE1PBE/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 PBE1PBE/3-21G
 hartrees
Energy at 0K-170.915932
Energy at 298.15K 
HF Energy-170.915932
Nuclear repulsion energy102.743625
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 PBE1PBE/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' 3166 3040 12.22 66.25 0.71 0.83
2 A' 3085 2963 14.30 37.21 0.04 0.08
3 A' 3082 2960 1.87 149.98 0.05 0.10
4 A' 2373 2279 4.10 43.53 0.30 0.46
5 A' 1564 1502 9.65 15.22 0.74 0.85
6 A' 1528 1467 11.60 19.51 0.70 0.82
7 A' 1464 1406 8.49 2.60 0.74 0.85
8 A' 1380 1325 1.94 8.26 0.68 0.81
9 A' 1128 1083 10.01 1.90 0.13 0.23
10 A' 1032 991 0.37 6.29 0.42 0.59
11 A' 859 825 0.02 5.21 0.20 0.33
12 A' 604 580 2.16 2.18 0.40 0.57
13 A' 244 234 2.38 2.50 0.72 0.84
14 A" 3172 3046 10.65 23.85 0.75 0.86
15 A" 3122 2998 0.21 90.17 0.75 0.86
16 A" 1560 1498 11.43 23.40 0.75 0.86
17 A" 1343 1290 0.08 9.97 0.75 0.86
18 A" 1160 1114 1.10 0.14 0.75 0.86
19 A" 822 789 7.23 0.67 0.75 0.86
20 A" 463 444 0.16 3.54 0.75 0.86
21 A" 230 221 0.48 0.30 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16688.2 cm-1
Scaled (by 0.9604) Zero Point Vibrational Energy (zpe) 16027.3 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 PBE1PBE/3-21G
ABC
0.91731 0.15732 0.14144

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.519 0.541 0.000
C2 0.000 0.817 0.000
C3 -0.770 -0.417 0.000
N4 -1.373 -1.412 0.000
H5 2.066 1.489 0.000
H6 1.803 -0.030 0.889
H7 1.803 -0.030 -0.889
H8 -0.276 1.406 0.885
H9 -0.276 1.406 -0.885

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54372.48123.48991.09471.09421.09422.17982.1798
C21.54371.45522.61882.17252.18162.18161.09781.0978
C32.48121.45521.16363.41722.74982.74982.08572.0857
N43.48992.61881.16364.49973.57643.57643.15093.1509
H51.09472.17253.41724.49971.77951.77952.50502.5050
H61.09422.18162.74983.57641.77951.77832.52643.0870
H71.09422.18162.74983.57641.77951.77833.08702.5264
H82.17981.09782.08573.15092.50502.52643.08701.7699
H92.17981.09782.08573.15092.50503.08702.52641.7699

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 111.628 C1 C2 H8 110.074
C1 C2 H9 110.074 C2 C1 H5 109.681
C2 C1 H6 110.431 C2 C1 H7 110.431
C2 C3 N4 179.280 C3 C2 H8 108.761
C3 C2 H9 108.761 H5 C1 H6 108.774
H5 C1 H7 108.774 H6 C1 H7 108.709
H8 C2 H9 107.434
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.618      
2 C -0.530      
3 C 0.371      
4 N -0.499      
5 H 0.232      
6 H 0.241      
7 H 0.241      
8 H 0.281      
9 H 0.281      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.164 3.069 0.000 3.755
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.805 -3.584 0.000
y -3.584 -27.221 0.000
z 0.000 0.000 -23.709
Traceless
 xyz
x -1.340 -3.584 0.000
y -3.584 -1.964 0.000
z 0.000 0.000 3.303
Polar
3z2-r26.607
x2-y20.416
xy-3.584
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.794 1.147 0.000
y 1.147 5.321 0.000
z 0.000 0.000 3.637


<r2> (average value of r2) Å2
<r2> 87.796
(<r2>)1/2 9.370