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All results from a given calculation for C2H5CN (ethyl cyanide)

using model chemistry: B3PW91/6-31G(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 B3PW91/6-31G(2df,p)
 hartrees
Energy at 0K-172.012021
Energy at 298.15K 
HF Energy-172.012021
Nuclear repulsion energy102.922203
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 B3PW91/6-31G(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' 3150 3028 13.86 70.59 0.71 0.83
2 A' 3064 2945 17.30 59.46 0.02 0.04
3 A' 3059 2941 4.31 152.78 0.05 0.09
4 A' 2369 2278 9.60 63.83 0.25 0.40
5 A' 1498 1441 5.05 8.61 0.73 0.85
6 A' 1462 1406 4.78 14.74 0.69 0.82
7 A' 1407 1353 1.07 1.82 0.69 0.82
8 A' 1340 1289 3.38 4.98 0.59 0.74
9 A' 1089 1047 3.82 3.69 0.11 0.20
10 A' 1029 990 0.36 4.34 0.50 0.67
11 A' 849 817 0.07 4.84 0.14 0.24
12 A' 554 532 0.97 1.44 0.32 0.49
13 A' 214 206 4.23 2.21 0.72 0.84
14 A" 3154 3032 12.72 28.95 0.75 0.86
15 A" 3100 2981 1.06 86.86 0.75 0.86
16 A" 1490 1433 6.55 15.23 0.75 0.86
17 A" 1281 1232 0.04 5.92 0.75 0.86
18 A" 1106 1063 0.27 0.16 0.75 0.86
19 A" 785 755 4.58 0.36 0.75 0.86
20 A" 404 389 0.48 2.28 0.75 0.86
21 A" 221 212 1.04 0.37 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16313.4 cm-1
Scaled (by 0.9614) Zero Point Vibrational Energy (zpe) 15683.7 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 B3PW91/6-31G(2df,p)
ABC
0.93802 0.15651 0.14117

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.514 0.565 0.000
C2 0.000 0.808 0.000
C3 -0.768 -0.432 0.000
N4 -1.366 -1.422 0.000
H5 2.043 1.521 0.000
H6 1.819 0.001 0.885
H7 1.819 0.001 -0.885
H8 -0.296 1.392 0.879
H9 -0.296 1.392 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53322.49013.49831.09301.09261.09262.17552.1755
C21.53321.45912.61522.16352.17772.17771.09591.0959
C32.49011.45911.15613.42292.76802.76802.07942.0794
N43.49832.61521.15614.50333.59843.59843.13633.1363
H51.09302.16353.42294.50331.77321.77322.50182.5018
H61.09262.17772.76803.59841.77321.76982.53163.0853
H71.09262.17772.76803.59841.77321.76983.08532.5316
H82.17551.09592.07943.13632.50182.53163.08531.7572
H92.17551.09592.07943.13632.50183.08532.53161.7572

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 112.623 C1 C2 H8 110.584
C1 C2 H9 110.584 C2 C1 H5 109.805
C2 C1 H6 110.948 C2 C1 H7 110.948
C2 C3 N4 179.373 C3 C2 H8 108.112
C3 C2 H9 108.112 H5 C1 H6 108.448
H5 C1 H7 108.448 H6 C1 H7 108.164
H8 C2 H9 106.596
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.443      
2 C -0.366      
3 C 0.287      
4 N -0.332      
5 H 0.154      
6 H 0.168      
7 H 0.168      
8 H 0.182      
9 H 0.182      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.254 3.254 0.000 3.958
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.599 -3.696 0.000
y -3.696 -26.997 0.000
z 0.000 0.000 -23.333
Traceless
 xyz
x -1.433 -3.696 0.000
y -3.696 -2.031 0.000
z 0.000 0.000 3.465
Polar
3z2-r26.929
x2-y20.399
xy-3.696
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.573 1.178 0.000
y 1.178 5.965 0.000
z 0.000 0.000 4.243


<r2> (average value of r2) Å2
<r2> 87.734
(<r2>)1/2 9.367