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

using model chemistry: QCISD(T)=FULL/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at QCISD(T)=FULL/Def2TZVPP
 hartrees
Energy at 0K-171.850385
Energy at 298.15K 
HF Energy-171.026400
Nuclear repulsion energy102.891440
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 QCISD(T)=FULL/Def2TZVPP
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3136 3136        
2 A' 3069 3069        
3 A' 3055 3055        
4 A' 2295 2295        
5 A' 1512 1512        
6 A' 1482 1482        
7 A' 1425 1425        
8 A' 1357 1357        
9 A' 1098 1098        
10 A' 1030 1030        
11 A' 843 843        
12 A' 535 535        
13 A' 206 206        
14 A" 3139 3139        
15 A" 3109 3109        
16 A" 1507 1507        
17 A" 1301 1301        
18 A" 1119 1119        
19 A" 788 788        
20 A" 379 379        
21 A" 225 225        

Unscaled Zero Point Vibrational Energy (zpe) 16305.2 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 16305.2 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 QCISD(T)=FULL/Def2TZVPP
ABC
0.92531 0.15708 0.14131

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/Def2TZVPP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.509 0.560 0.000
C2 0.000 0.822 0.000
C3 -0.770 -0.429 0.000
N4 -1.357 -1.430 0.000
H5 2.046 1.507 0.000
H6 1.801 -0.005 0.882
H7 1.801 -0.005 -0.882
H8 -0.292 1.397 0.878
H9 -0.292 1.397 -0.878

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53152.48453.48941.08811.08811.08812.17162.1716
C21.53151.46862.62872.15772.16942.16941.08961.0896
C32.48451.46861.16023.41722.75102.75102.08162.0816
N43.48942.62871.16024.49503.57523.57523.14553.1455
H51.08812.15773.41724.49501.76781.76782.50022.5002
H61.08812.16942.75103.57521.76781.76482.51973.0737
H71.08812.16942.75103.57521.76781.76483.07372.5197
H82.17161.08962.08163.14552.50022.51973.07371.7559
H92.17161.08962.08163.14552.50023.07372.51971.7559

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 111.799 C1 C2 H8 110.760
C1 C2 H9 110.760 C2 C1 H5 109.749
C2 C1 H6 110.677 C2 C1 H7 110.677
C2 C3 N4 178.794 C3 C2 H8 107.999
C3 C2 H9 107.999 H5 C1 H6 108.650
H5 C1 H7 108.650 H6 C1 H7 108.381
H8 C2 H9 107.358
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability