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

using model chemistry: QCISD(T)/aug-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(T)/aug-cc-pVDZ
 hartrees
Energy at 0K-171.628574
Energy at 298.15K 
HF Energy-170.978055
Nuclear repulsion energy101.598366
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-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' 3121 3052        
2 A' 3049 2981        
3 A' 3036 2968        
4 A' 2246 2196        
5 A' 1484 1451        
6 A' 1456 1424        
7 A' 1397 1366        
8 A' 1330 1300        
9 A' 1083 1059        
10 A' 1020 997        
11 A' 830 812        
12 A' 520 508        
13 A' 199 195        
14 A" 3126 3056        
15 A" 3094 3025        
16 A" 1479 1446        
17 A" 1273 1245        
18 A" 1099 1075        
19 A" 775 758        
20 A" 365 357        
21 A" 217 212        

Unscaled Zero Point Vibrational Energy (zpe) 16098.8 cm-1
Scaled (by 0.9778) Zero Point Vibrational Energy (zpe) 15741.4 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-pVDZ
ABC
0.90420 0.15325 0.13793

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.523 0.572 0.000
C2 0.000 0.832 0.000
C3 -0.777 -0.435 0.000
N4 -1.370 -1.454 0.000
H5 2.063 1.535 0.000
H6 1.822 0.001 0.895
H7 1.822 0.001 -0.895
H8 -0.298 1.414 0.891
H9 -0.298 1.414 -0.891

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.54492.51063.53191.10391.10361.10362.19442.1944
C21.54491.48612.66512.17952.19352.19351.10481.1048
C32.51061.48611.17923.45622.78282.78282.10742.1074
N43.53192.66511.17924.55193.62003.62003.18883.1888
H51.10392.17953.45624.55191.79291.79292.52582.5258
H61.10362.19352.78283.62001.79291.79082.54733.1111
H71.10362.19352.78283.62001.79291.79083.11112.5473
H82.19441.10482.10743.18882.52582.54733.11111.7813
H92.19441.10482.10743.18882.52583.11112.54731.7813

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 111.840 C1 C2 H8 110.735
C1 C2 H9 110.735 C2 C1 H5 109.611
C2 C1 H6 110.735 C2 C1 H7 110.735
C2 C3 N4 178.678 C3 C2 H8 107.955
C3 C2 H9 107.955 H5 C1 H6 108.622
H5 C1 H7 108.622 H6 C1 H7 108.458
H8 C2 H9 107.454
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability