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: mPW1PW91/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at mPW1PW91/6-31G(2df,p)
 hartrees
Energy at 0K-172.033261
Energy at 298.15K 
HF Energy-172.033261
Nuclear repulsion energy103.093672
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 mPW1PW91/6-31G(2df,p)
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' 3168 3024 13.11 69.51 0.71 0.83
2 A' 3081 2941 15.94 13.30 0.31 0.48
3 A' 3079 2939 4.62 197.14 0.03 0.05
4 A' 2391 2283 10.00 62.83 0.25 0.40
5 A' 1506 1438 5.16 8.39 0.73 0.85
6 A' 1470 1404 4.90 14.27 0.70 0.82
7 A' 1415 1351 1.21 1.77 0.67 0.80
8 A' 1349 1287 3.42 4.56 0.59 0.74
9 A' 1097 1047 3.90 3.91 0.12 0.21
10 A' 1037 990 0.47 4.19 0.51 0.68
11 A' 855 817 0.08 4.83 0.14 0.24
12 A' 558 533 0.99 1.44 0.34 0.50
13 A' 215 205 4.34 2.19 0.72 0.84
14 A" 3173 3029 11.88 27.38 0.75 0.86
15 A" 3123 2981 0.76 86.61 0.75 0.86
16 A" 1498 1430 6.77 14.90 0.75 0.86
17 A" 1289 1230 0.04 5.72 0.75 0.86
18 A" 1113 1062 0.27 0.14 0.75 0.86
19 A" 789 753 4.61 0.36 0.75 0.86
20 A" 407 389 0.53 2.29 0.75 0.86
21 A" 223 213 1.07 0.37 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16416.5 cm-1
Scaled (by 0.9547) Zero Point Vibrational Energy (zpe) 15672.9 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 mPW1PW91/6-31G(2df,p)
ABC
0.93901 0.15717 0.14172

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.511 0.563 0.000
C2 0.000 0.809 0.000
C3 -0.767 -0.431 0.000
N4 -1.363 -1.419 0.000
H5 2.041 1.516 0.000
H6 1.813 -0.001 0.884
H7 1.813 -0.001 -0.884
H8 -0.296 1.391 0.878
H9 -0.296 1.391 -0.878

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53052.48483.49051.09161.09111.09112.17272.1727
C21.53051.45812.61172.16062.17372.17371.09411.0941
C32.48481.45811.15363.41762.76072.76072.07662.0766
N43.49052.61171.15364.49513.58863.58863.13103.1310
H51.09162.16063.41764.49511.77101.77102.50022.5002
H61.09112.17372.76073.58861.77101.76752.52703.0806
H71.09112.17372.76073.58861.77101.76753.08062.5270
H82.17271.09412.07663.13102.50022.52703.08061.7561
H92.17271.09412.07663.13102.50023.08062.52701.7561

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 112.465 C1 C2 H8 110.648
C1 C2 H9 110.648 C2 C1 H5 109.841
C2 C1 H6 110.905 C2 C1 H7 110.905
C2 C3 N4 179.385 C3 C2 H8 108.057
C3 C2 H9 108.057 H5 C1 H6 108.463
H5 C1 H7 108.463 H6 C1 H7 108.185
H8 C2 H9 106.747
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.449      
2 C -0.371      
3 C 0.281      
4 N -0.329      
5 H 0.157      
6 H 0.170      
7 H 0.170      
8 H 0.185      
9 H 0.185      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.256 3.262 0.000 3.966
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.587 -3.689 0.000
y -3.689 -26.982 0.000
z 0.000 0.000 -23.320
Traceless
 xyz
x -1.436 -3.689 0.000
y -3.689 -2.029 0.000
z 0.000 0.000 3.464
Polar
3z2-r26.929
x2-y20.395
xy-3.689
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.532 1.162 0.000
y 1.162 5.919 0.000
z 0.000 0.000 4.219


<r2> (average value of r2) Å2
<r2> 87.454
(<r2>)1/2 9.352