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

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-170.900723
Energy at 298.15K 
HF Energy-170.900723
Nuclear repulsion energy101.903219
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 PBEPBE/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' 3078 3050 13.93 67.15 0.72 0.83
2 A' 3001 2973 14.87 77.08 0.01 0.03
3 A' 2989 2962 4.03 115.69 0.07 0.13
4 A' 2258 2238 2.82 47.41 0.30 0.46
5 A' 1522 1508 8.47 15.34 0.74 0.85
6 A' 1483 1469 10.22 20.72 0.69 0.82
7 A' 1416 1403 6.06 3.00 0.75 0.86
8 A' 1330 1318 1.16 9.86 0.70 0.82
9 A' 1088 1078 8.42 1.73 0.13 0.23
10 A' 994 985 0.17 5.38 0.41 0.58
11 A' 831 823 0.18 4.96 0.20 0.33
12 A' 583 577 2.15 2.02 0.37 0.54
13 A' 235 233 1.96 2.45 0.72 0.84
14 A" 3085 3057 13.07 26.78 0.75 0.86
15 A" 3025 2998 0.85 88.88 0.75 0.86
16 A" 1517 1503 10.17 23.62 0.75 0.86
17 A" 1300 1288 0.07 10.60 0.75 0.86
18 A" 1119 1109 1.10 0.15 0.75 0.86
19 A" 795 788 6.66 0.60 0.75 0.86
20 A" 447 443 0.30 3.14 0.75 0.86
21 A" 224 222 0.42 0.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16158.3 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 16011.2 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 PBEPBE/3-21G
ABC
0.90513 0.15469 0.13913

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.530 0.548 0.000
C2 0.000 0.822 0.000
C3 -0.775 -0.419 0.000
N4 -1.384 -1.427 0.000
H5 2.078 1.505 0.000
H6 1.818 -0.026 0.896
H7 1.818 -0.026 -0.896
H8 -0.278 1.416 0.891
H9 -0.278 1.416 -0.891

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.55482.49993.52071.10301.10221.10222.19532.1953
C21.55481.46332.64092.18742.19682.19681.10671.1067
C32.49991.46331.17773.44122.77082.77082.09972.0997
N43.52072.64091.17774.53713.60773.60773.17803.1780
H51.10302.18743.44124.53711.79361.79362.52072.5207
H61.10222.19682.77083.60771.79361.79192.54413.1092
H71.10222.19682.77083.60771.79361.79193.10922.5441
H82.19531.10672.09973.17802.52072.54413.10921.7830
H92.19531.10672.09973.17802.52073.10922.54411.7830

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 111.816 C1 C2 H8 110.003
C1 C2 H9 110.003 C2 C1 H5 109.599
C2 C1 H6 110.382 C2 C1 H7 110.382
C2 C3 N4 179.184 C3 C2 H8 108.785
C3 C2 H9 108.785 H5 C1 H6 108.847
H5 C1 H7 108.847 H6 C1 H7 108.748
H8 C2 H9 107.331
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.585      
2 C -0.505      
3 C 0.366      
4 N -0.482      
5 H 0.219      
6 H 0.229      
7 H 0.229      
8 H 0.265      
9 H 0.265      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.105 2.970 0.000 3.640
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.674 -3.448 0.000
y -3.448 -27.071 0.000
z 0.000 0.000 -23.714
Traceless
 xyz
x -1.281 -3.448 0.000
y -3.448 -1.877 0.000
z 0.000 0.000 3.158
Polar
3z2-r26.317
x2-y20.397
xy-3.448
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.971 1.227 0.000
y 1.227 5.500 0.000
z 0.000 0.000 3.710


<r2> (average value of r2) Å2
<r2> 88.910
(<r2>)1/2 9.429