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/6-311G*

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/6-311G*
 hartrees
Energy at 0K-171.640100
Energy at 298.15K 
HF Energy-170.992799
Nuclear repulsion energy102.601366
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/6-311G*
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' 3192 3023 15.85 70.43 0.72 0.84
2 A' 3109 2944 7.49 90.70 0.09 0.17
3 A' 3098 2935 15.09 126.46 0.01 0.02
4 A' 2209 2092 0.26 40.09 0.25 0.40
5 A' 1544 1463 8.90 6.09 0.74 0.85
6 A' 1520 1440 6.20 13.66 0.74 0.85
7 A' 1453 1376 4.16 2.08 0.26 0.41
8 A' 1379 1306 2.23 3.21 0.55 0.71
9 A' 1118 1059 4.53 3.80 0.16 0.27
10 A' 1048 993 1.08 4.99 0.51 0.68
11 A' 858 813 0.11 4.84 0.14 0.24
12 A' 545 516 0.86 1.63 0.33 0.49
13 A' 211 199 3.53 2.54 0.73 0.85
14 A" 3198 3029 15.09 25.94 0.75 0.86
15 A" 3157 2990 0.83 90.80 0.75 0.86
16 A" 1540 1458 10.21 12.07 0.75 0.86
17 A" 1320 1251 0.02 5.75 0.75 0.86
18 A" 1143 1082 0.40 0.12 0.75 0.86
19 A" 803 760 3.76 0.29 0.75 0.86
20 A" 384 364 0.09 2.48 0.75 0.86
21 A" 229 217 0.75 0.62 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16528.5 cm-1
Scaled (by 0.9471) Zero Point Vibrational Energy (zpe) 15654.1 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/6-311G*
ABC
0.92380 0.15631 0.14067

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.510 0.563 0.000
C2 0.000 0.821 0.000
C3 -0.767 -0.426 0.000
N4 -1.362 -1.437 0.000
H5 2.049 1.512 0.000
H6 1.807 -0.002 0.884
H7 1.807 -0.002 -0.884
H8 -0.292 1.402 0.879
H9 -0.292 1.402 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.53162.48283.49981.09131.09061.09062.17332.1733
C21.53161.46382.63682.16282.17312.17311.09321.0932
C32.48281.46381.17323.41892.75432.75432.08262.0826
N43.49982.63681.17324.50933.58873.58873.15833.1583
H51.09132.16283.41894.50931.77011.77012.50372.5037
H61.09062.17312.75433.58871.77011.76802.52523.0796
H71.09062.17312.75433.58871.77011.76803.07962.5252
H82.17331.09322.08263.15832.50372.52523.07961.7574
H92.17331.09322.08263.15832.50373.07962.52521.7574

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 111.948 C1 C2 H8 110.671
C1 C2 H9 110.671 C2 C1 H5 109.954
C2 C1 H6 110.812 C2 C1 H7 110.812
C2 C3 N4 178.817 C3 C2 H8 108.194
C3 C2 H9 108.194 H5 C1 H6 108.443
H5 C1 H7 108.443 H6 C1 H7 108.302
H8 C2 H9 106.985
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability