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: BLYP/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 BLYP/3-21G*
 hartrees
Energy at 0K-171.050853
Energy at 298.15K 
HF Energy-171.050853
Nuclear repulsion energy101.620251
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 BLYP/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' 3057 3037 19.34 66.79 0.72 0.84
2 A' 2992 2973 17.44 83.84 0.02 0.03
3 A' 2978 2959 6.17 108.76 0.08 0.15
4 A' 2246 2232 1.73 46.60 0.29 0.45
5 A' 1534 1524 6.50 14.78 0.74 0.85
6 A' 1499 1489 7.03 22.27 0.69 0.82
7 A' 1427 1417 2.59 2.92 0.75 0.86
8 A' 1339 1330 0.98 10.77 0.69 0.81
9 A' 1090 1083 6.93 1.63 0.15 0.27
10 A' 962 956 0.14 6.31 0.39 0.56
11 A' 813 808 0.00 5.19 0.21 0.34
12 A' 575 571 1.95 2.02 0.32 0.48
13 A' 235 233 2.02 2.49 0.72 0.84
14 A" 3065 3045 19.29 26.94 0.75 0.86
15 A" 3007 2987 2.14 89.83 0.75 0.86
16 A" 1529 1519 7.74 23.75 0.75 0.86
17 A" 1306 1297 0.01 11.48 0.75 0.86
18 A" 1127 1120 0.93 0.24 0.75 0.86
19 A" 799 794 4.89 0.53 0.75 0.86
20 A" 442 439 0.16 3.19 0.75 0.86
21 A" 222 220 0.45 0.27 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16121.5 cm-1
Scaled (by 0.9935) Zero Point Vibrational Energy (zpe) 16016.7 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 BLYP/3-21G*
ABC
0.90344 0.15319 0.13786

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.541 0.550 0.000
C2 0.000 0.823 0.000
C3 -0.782 -0.423 0.000
N4 -1.393 -1.428 0.000
H5 2.083 1.509 0.000
H6 1.830 -0.022 0.895
H7 1.830 -0.022 -0.895
H8 -0.276 1.416 0.890
H9 -0.276 1.416 -0.890

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.56532.51873.53891.10161.10061.10062.20112.2011
C21.56531.47062.64722.19362.20512.20511.10471.1047
C32.51871.47061.17663.45582.78962.78962.10472.1047
N43.53892.64721.17664.55123.62823.62823.18283.1828
H51.10162.19363.45584.55121.79151.79152.52352.5235
H61.10062.20512.78963.62821.79151.78992.54993.1126
H71.10062.20512.78963.62821.79151.78993.11262.5499
H82.20111.10472.10473.18282.52352.54993.11261.7801
H92.20111.10472.10473.18282.52353.11262.54991.7801

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 112.083 C1 C2 H8 109.849
C1 C2 H9 109.849 C2 C1 H5 109.451
C2 C1 H6 110.400 C2 C1 H7 110.400
C2 C3 N4 179.176 C3 C2 H8 108.789
C3 C2 H9 108.789 H5 C1 H6 108.877
H5 C1 H7 108.877 H6 C1 H7 108.801
H8 C2 H9 107.356
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.507      
2 C -0.432      
3 C 0.344      
4 N -0.466      
5 H 0.191      
6 H 0.201      
7 H 0.201      
8 H 0.234      
9 H 0.234      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.077 2.916 0.000 3.580
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.731 -3.462 0.000
y -3.462 -27.159 0.000
z 0.000 0.000 -23.754
Traceless
 xyz
x -1.275 -3.462 0.000
y -3.462 -1.916 0.000
z 0.000 0.000 3.191
Polar
3z2-r26.381
x2-y20.428
xy-3.462
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.974 1.227 0.000
y 1.227 5.471 0.000
z 0.000 0.000 3.703


<r2> (average value of r2) Å2
<r2> 89.563
(<r2>)1/2 9.464