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=FULL/TZVP

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=FULL/TZVP
 hartrees
Energy at 0K-171.682305
Energy at 298.15K 
HF Energy-171.014411
Nuclear repulsion energy102.906111
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=FULL/TZVP
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' 3197 3045 15.93 65.23 0.71 0.83
2 A' 3114 2967 7.32 101.14 0.08 0.15
3 A' 3101 2954 14.96 153.16 0.01 0.02
4 A' 2220 2115 0.07 46.39 0.21 0.34
5 A' 1528 1455 5.45 5.72 0.75 0.86
6 A' 1499 1428 5.30 11.61 0.74 0.85
7 A' 1445 1377 1.57 1.38 0.22 0.36
8 A' 1377 1312 2.64 2.26 0.62 0.77
9 A' 1116 1063 3.18 3.32 0.13 0.24
10 A' 1041 992 0.50 5.99 0.45 0.62
11 A' 856 816 0.15 5.14 0.12 0.21
12 A' 538 513 0.65 1.91 0.28 0.43
13 A' 204 194 3.60 2.90 0.75 0.85
14 A" 3201 3049 15.13 21.18 0.75 0.86
15 A" 3163 3014 0.50 86.44 0.75 0.86
16 A" 1523 1451 7.50 9.97 0.75 0.86
17 A" 1306 1244 0.06 5.50 0.75 0.86
18 A" 1133 1080 0.57 0.30 0.75 0.86
19 A" 805 767 1.80 0.21 0.75 0.86
20 A" 376 359 0.11 2.49 0.75 0.86
21 A" 230 219 0.87 0.96 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16485.6 cm-1
Scaled (by 0.9527) Zero Point Vibrational Energy (zpe) 15705.9 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=FULL/TZVP
ABC
0.92382 0.15756 0.14166

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/TZVP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.506 0.557 0.000
C2 0.000 0.821 0.000
C3 -0.769 -0.421 0.000
N4 -1.356 -1.432 0.000
H5 2.047 1.502 0.000
H6 1.797 -0.009 0.882
H7 1.797 -0.009 -0.882
H8 -0.289 1.398 0.878
H9 -0.289 1.398 -0.878

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.52892.47603.48511.08821.08781.08782.16772.1677
C21.52891.45982.62882.15732.16692.16691.08981.0898
C32.47601.45981.16923.40912.74392.74392.07562.0756
N43.48512.62881.16924.49243.56933.56933.14893.1489
H51.08822.15733.40914.49241.76721.76722.49752.4975
H61.08782.16692.74393.56931.76721.76332.51623.0705
H71.08782.16692.74393.56931.76721.76333.07052.5162
H82.16771.08982.07563.14892.49752.51623.07051.7562
H92.16771.08982.07563.14892.49753.07052.51621.7562

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 111.856 C1 C2 H8 110.623
C1 C2 H9 110.623 C2 C1 H5 109.890
C2 C1 H6 110.685 C2 C1 H7 110.685
C2 C3 N4 178.372 C3 C2 H8 108.112
C3 C2 H9 108.112 H5 C1 H6 108.615
H5 C1 H7 108.615 H6 C1 H7 108.289
H8 C2 H9 107.356
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability