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

using model chemistry: QCISD(T)/aug-cc-pVTZ

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)/aug-cc-pVTZ
 hartrees
Energy at 0K-171.779732
Energy at 298.15K 
HF Energy-171.021731
Nuclear repulsion energy102.668124
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)/aug-cc-pVTZ
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' 3129 3025        
2 A' 3061 2960        
3 A' 3047 2946        
4 A' 2277 2201        
5 A' 1515 1465        
6 A' 1486 1437        
7 A' 1423 1376        
8 A' 1354 1309        
9 A' 1098 1061        
10 A' 1025 991        
11 A' 838 810        
12 A' 531 513        
13 A' 203 197        
14 A" 3133 3029        
15 A" 3101 2998        
16 A" 1509 1459        
17 A" 1297 1254        
18 A" 1118 1081        
19 A" 786 760        
20 A" 372 360        
21 A" 222 215        

Unscaled Zero Point Vibrational Energy (zpe) 16262.5 cm-1
Scaled (by 0.9668) Zero Point Vibrational Energy (zpe) 15722.6 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)/aug-cc-pVTZ
ABC
0.92155 0.15644 0.14075

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/aug-cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.512 0.562 0.000
C2 0.000 0.823 0.000
C3 -0.771 -0.430 0.000
N4 -1.360 -1.433 0.000
H5 2.050 1.511 0.000
H6 1.805 -0.006 0.885
H7 1.805 -0.006 -0.885
H8 -0.293 1.400 0.880
H9 -0.293 1.400 -0.880

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53442.48873.49661.09121.09101.09102.17642.1764
C21.53441.47062.63392.16232.17442.17441.09251.0925
C32.48871.47061.16343.42382.75662.75662.08532.0853
N43.49662.63391.16344.50493.58323.58323.15193.1519
H51.09122.16233.42384.50491.77281.77282.50572.5057
H61.09102.17442.75663.58321.77281.76922.52573.0813
H71.09102.17442.75663.58321.77281.76923.08132.5257
H82.17641.09252.08533.15192.50572.52573.08131.7606
H92.17641.09252.08533.15192.50573.08132.52571.7606

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 111.806 C1 C2 H8 110.766
C1 C2 H9 110.766 C2 C1 H5 109.729
C2 C1 H6 110.700 C2 C1 H7 110.700
C2 C3 N4 178.823 C3 C2 H8 107.983
C3 C2 H9 107.983 H5 C1 H6 108.652
H5 C1 H7 108.652 H6 C1 H7 108.348
H8 C2 H9 107.367
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability