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

using model chemistry: QCISD/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-171.583290
Energy at 298.15K 
HF Energy-170.971553
Nuclear repulsion energy102.427046
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/6-31+G**
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' 3198 3023 21.99      
2 A' 3125 2954 8.44      
3 A' 3112 2942 20.21      
4 A' 2334 2207 1.96      
5 A' 1550 1466 4.96      
6 A' 1527 1444 3.68      
7 A' 1470 1390 1.18      
8 A' 1395 1319 3.90      
9 A' 1125 1064 3.05      
10 A' 1046 989 0.88      
11 A' 852 805 0.93      
12 A' 533 504 0.78      
13 A' 206 195 4.02      
14 A" 3205 3030 21.86      
15 A" 3170 2997 1.02      
16 A" 1542 1458 6.64      
17 A" 1317 1246 0.08      
18 A" 1144 1081 0.49      
19 A" 806 762 1.43      
20 A" 373 353 0.18      
21 A" 225 213 0.94      

Unscaled Zero Point Vibrational Energy (zpe) 16627.7 cm-1
Scaled (by 0.9454) Zero Point Vibrational Energy (zpe) 15719.8 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/6-31+G**
ABC
0.93083 0.15476 0.13958

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.514 0.577 0.000
C2 0.000 0.821 0.000
C3 -0.768 -0.439 0.000
N4 -1.365 -1.444 0.000
H5 2.041 1.532 0.000
H6 1.815 0.015 0.884
H7 1.815 0.015 -0.884
H8 -0.299 1.395 0.879
H9 -0.299 1.395 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53382.49813.51751.09041.08981.08982.17472.1747
C21.53381.47572.64442.16112.17392.17391.09151.0915
C32.49811.47571.16883.43132.76782.76782.08702.0870
N43.51752.64441.16884.52253.60873.60873.15703.1570
H51.09042.16113.43134.52251.76981.76982.50342.5034
H61.08982.17392.76783.60871.76981.76812.52453.0793
H71.08982.17392.76783.60871.76981.76813.07932.5245
H82.17471.09152.08703.15702.50342.52453.07931.7583
H92.17471.09152.08703.15702.50343.07932.52451.7583

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 112.202 C1 C2 H8 110.740
C1 C2 H9 110.740 C2 C1 H5 109.728
C2 C1 H6 110.774 C2 C1 H7 110.774
C2 C3 N4 179.345 C3 C2 H8 107.829
C3 C2 H9 107.829 H5 C1 H6 108.538
H5 C1 H7 108.538 H6 C1 H7 108.423
H8 C2 H9 107.310
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability