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

using model chemistry: QCISD/cc-pVDZ

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/cc-pVDZ
 hartrees
Energy at 0K-171.577515
Energy at 298.15K 
HF Energy-170.972460
Nuclear repulsion energy101.880800
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/cc-pVDZ
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' 3163 3035 18.83      
2 A' 3089 2964 8.05      
3 A' 3073 2949 18.74      
4 A' 2326 2232 0.76      
5 A' 1503 1442 4.11      
6 A' 1477 1417 3.26      
7 A' 1424 1366 0.41      
8 A' 1362 1307 4.93      
9 A' 1104 1059 2.41      
10 A' 1042 1000 1.04      
11 A' 848 814 0.67      
12 A' 534 513 0.60      
13 A' 210 202 3.54      
14 A" 3168 3039 18.84      
15 A" 3135 3008 1.18      
16 A" 1496 1435 5.77      
17 A" 1294 1241 0.01      
18 A" 1117 1072 0.57      
19 A" 789 757 2.18      
20 A" 384 368 0.21      
21 A" 229 220 0.82      

Unscaled Zero Point Vibrational Energy (zpe) 16384.0 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 15718.8 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/cc-pVDZ
ABC
0.91715 0.15361 0.13850

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.519 0.578 0.000
C2 0.000 0.825 0.000
C3 -0.772 -0.441 0.000
N4 -1.368 -1.450 0.000
H5 2.055 1.543 0.000
H6 1.823 0.008 0.895
H7 1.823 0.008 -0.895
H8 -0.302 1.407 0.889
H9 -0.302 1.407 -0.889

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53872.50743.52821.10361.10361.10362.18942.1894
C21.53871.48272.65452.17672.18892.18891.10451.1045
C32.50741.48271.17183.45362.78162.78162.10362.1036
N43.52822.65451.17184.54693.62093.62093.17603.1760
H51.10362.17673.45364.54691.79161.79162.52282.5228
H61.10362.18892.78163.62091.79161.78912.54473.1072
H71.10362.18892.78163.62091.79161.78913.10722.5447
H82.18941.10452.10363.17602.52282.54473.10721.7772
H92.18941.10452.10363.17602.52283.10722.54471.7772

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 112.160 C1 C2 H8 110.777
C1 C2 H9 110.777 C2 C1 H5 109.837
C2 C1 H6 110.796 C2 C1 H7 110.796
C2 C3 N4 179.199 C3 C2 H8 107.903
C3 C2 H9 107.903 H5 C1 H6 108.523
H5 C1 H7 108.523 H6 C1 H7 108.298
H8 C2 H9 107.122
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability