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: PBEPBEultrafine/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 PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-171.838598
Energy at 298.15K 
HF Energy-171.838598
Nuclear repulsion energy102.064987
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 PBEPBEultrafine/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' 3087 3036 15.51 76.94 0.72 0.84
2 A' 3007 2957 17.74 91.02 0.01 0.02
3 A' 2989 2940 6.27 129.61 0.07 0.12
4 A' 2284 2246 6.94 64.28 0.29 0.45
5 A' 1487 1462 6.09 11.54 0.74 0.85
6 A' 1449 1425 5.11 19.45 0.69 0.81
7 A' 1390 1367 1.46 3.22 0.72 0.84
8 A' 1316 1295 2.86 7.71 0.64 0.78
9 A' 1069 1051 4.77 3.01 0.14 0.24
10 A' 1010 993 0.20 4.33 0.52 0.68
11 A' 835 821 0.07 4.64 0.18 0.31
12 A' 535 526 1.10 1.81 0.38 0.55
13 A' 206 202 3.44 2.86 0.73 0.84
14 A" 3092 3041 14.69 35.30 0.75 0.86
15 A" 3027 2977 2.21 91.80 0.75 0.86
16 A" 1478 1454 7.72 19.86 0.75 0.86
17 A" 1259 1238 0.08 8.76 0.75 0.86
18 A" 1086 1068 0.30 0.20 0.75 0.86
19 A" 773 761 5.19 0.37 0.75 0.86
20 A" 386 380 0.11 3.14 0.75 0.86
21 A" 220 216 0.88 0.59 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 15992.0 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 15728.1 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 PBEPBEultrafine/6-31G*
ABC
0.92413 0.15408 0.13900

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.522 0.572 0.000
C2 0.000 0.814 0.000
C3 -0.772 -0.433 0.000
N4 -1.375 -1.439 0.000
H5 2.053 1.537 0.000
H6 1.831 0.004 0.892
H7 1.831 0.004 -0.892
H8 -0.297 1.406 0.885
H9 -0.297 1.406 -0.885

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54142.50393.52651.10201.10151.10152.18832.1883
C21.54141.46612.63962.17702.19182.19181.10551.1055
C32.50391.46611.17353.44392.78562.78562.09482.0948
N43.52652.63961.17354.54003.62723.62723.16843.1684
H51.10202.17703.44394.54001.78761.78762.51502.5150
H61.10152.19182.78563.62721.78761.78442.54793.1067
H71.10152.19182.78563.62721.78761.78443.10672.5479
H82.18831.10552.09483.16842.51502.54793.10671.7709
H92.18831.10552.09483.16842.51503.10672.54791.7709

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 112.704 C1 C2 H8 110.453
C1 C2 H9 110.453 C2 C1 H5 109.768
C2 C1 H6 110.967 C2 C1 H7 110.967
C2 C3 N4 179.181 C3 C2 H8 108.279
C3 C2 H9 108.279 H5 C1 H6 108.433
H5 C1 H7 108.433 H6 C1 H7 108.193
H8 C2 H9 106.440
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.485      
2 C -0.386      
3 C 0.362      
4 N -0.461      
5 H 0.176      
6 H 0.187      
7 H 0.187      
8 H 0.210      
9 H 0.210      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.195 3.175 0.000 3.859
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.654 -3.605 0.000
y -3.605 -27.095 0.000
z 0.000 0.000 -23.538
Traceless
 xyz
x -1.338 -3.605 0.000
y -3.605 -1.998 0.000
z 0.000 0.000 3.336
Polar
3z2-r26.673
x2-y20.440
xy-3.605
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.409 1.318 0.000
y 1.318 5.981 0.000
z 0.000 0.000 4.042


<r2> (average value of r2) Å2
<r2> 88.926
(<r2>)1/2 9.430