return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: MP2/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 MP2/cc-pVDZ
 hartrees
Energy at 0K-171.542538
Energy at 298.15K 
HF Energy-170.970053
Nuclear repulsion energy101.885220
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 MP2/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' 3202 3050 13.38 73.78 0.72 0.84
2 A' 3109 2961 7.15 114.35 0.07 0.14
3 A' 3099 2952 15.86 115.14 0.01 0.02
4 A' 2195 2090 0.65 37.09 0.26 0.41
5 A' 1504 1432 4.75 7.98 0.74 0.85
6 A' 1472 1402 4.12 14.13 0.73 0.85
7 A' 1414 1346 0.71 1.59 0.41 0.58
8 A' 1352 1287 3.91 2.52 0.51 0.68
9 A' 1103 1051 2.60 5.10 0.16 0.28
10 A' 1046 997 0.79 3.83 0.60 0.75
11 A' 856 815 0.11 5.29 0.12 0.22
12 A' 531 506 0.68 1.26 0.34 0.50
13 A' 206 196 3.09 2.33 0.73 0.84
14 A" 3207 3054 12.23 29.97 0.75 0.86
15 A" 3164 3014 1.14 94.15 0.75 0.86
16 A" 1496 1425 6.81 14.09 0.75 0.86
17 A" 1292 1231 0.00 4.93 0.75 0.86
18 A" 1113 1060 0.61 0.15 0.75 0.86
19 A" 789 752 2.82 0.30 0.75 0.86
20 A" 380 362 0.07 2.08 0.75 0.86
21 A" 232 221 0.72 0.58 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16378.5 cm-1
Scaled (by 0.9525) Zero Point Vibrational Energy (zpe) 15600.6 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 MP2/cc-pVDZ
ABC
0.91282 0.15426 0.13890

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.515 0.573 0.000
C2 0.000 0.827 0.000
C3 -0.770 -0.430 0.000
N4 -1.366 -1.454 0.000
H5 2.056 1.532 0.000
H6 1.814 0.002 0.892
H7 1.814 0.002 -0.892
H8 -0.298 1.411 0.887
H9 -0.298 1.411 -0.887

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53582.49473.52221.10121.10121.10122.18472.1847
C21.53581.47342.65822.17352.18372.18371.10311.1031
C32.49471.47341.18503.43982.76762.76762.09742.0974
N43.52222.65821.18504.54143.60973.60973.18383.1838
H51.10122.17353.43984.54141.78791.78792.51772.5177
H61.10122.18372.76763.60971.78791.78492.53903.1004
H71.10122.18372.76763.60971.78791.78493.10042.5390
H82.18471.10312.09743.18382.51772.53903.10041.7735
H92.18471.10312.09743.18382.51773.10042.53901.7735

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 111.986 C1 C2 H8 110.702
C1 C2 H9 110.702 C2 C1 H5 109.927
C2 C1 H6 110.736 C2 C1 H7 110.736
C2 C3 N4 178.725 C3 C2 H8 108.129
C3 C2 H9 108.129 H5 C1 H6 108.544
H5 C1 H7 108.544 H6 C1 H7 108.285
H8 C2 H9 107.010
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability