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 C2H5I (Ethyl iodide)

using model chemistry: mPW1PW91/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at mPW1PW91/STO-3G
 hartrees
Energy at 0K-6931.656793
Energy at 298.15K 
HF Energy-6931.656793
Nuclear repulsion energy214.128126
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 mPW1PW91/STO-3G
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' 3524 3097 0.31 43.17 0.71 0.83
2 A' 3398 2987 1.52 38.78 0.13 0.23
3 A' 3357 2951 0.62 56.33 0.03 0.05
4 A' 1695 1490 2.15 7.87 0.74 0.85
5 A' 1665 1463 1.90 19.98 0.75 0.86
6 A' 1586 1394 1.22 7.96 0.60 0.75
7 A' 1411 1240 54.01 2.18 0.30 0.46
8 A' 1172 1030 2.47 5.34 0.64 0.78
9 A' 1086 955 8.88 4.02 0.75 0.86
10 A' 620 545 5.43 18.43 0.33 0.49
11 A' 281 247 1.28 3.06 0.51 0.67
12 A" 3542 3113 0.29 11.05 0.75 0.86
13 A" 3514 3088 0.17 44.28 0.75 0.86
14 A" 1687 1483 4.58 17.74 0.75 0.86
15 A" 1393 1224 0.07 11.08 0.75 0.86
16 A" 1124 987 1.82 5.64 0.75 0.86
17 A" 816 717 4.17 0.80 0.75 0.86
18 A" 252 221 0.09 0.06 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16059.8 cm-1
Scaled (by 0.8789) Zero Point Vibrational Energy (zpe) 14115.0 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 mPW1PW91/STO-3G
ABC
0.98075 0.09769 0.09194

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/STO-3G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.606 -1.415 0.000
C2 -0.581 -2.401 0.000
I3 0.000 0.642 0.000
H4 1.232 -1.575 0.889
H5 1.232 -1.575 -0.889
H6 -0.199 -3.432 0.000
H7 -1.207 -2.265 0.891
H8 -1.207 -2.265 -0.891

Atom - Atom Distances (Å)
  C1 C2 I3 H4 H5 H6 H7 H8
C11.54252.14441.09951.09952.17122.19132.1913
C21.54253.09792.18172.18171.09951.09741.0974
I32.14443.09792.68782.68784.07873.27113.2711
H41.09952.18172.68781.77812.50712.53523.0975
H51.09952.18172.68781.77812.50713.09752.5352
H62.17121.09954.07872.50712.50711.78131.7813
H72.19131.09743.27112.53523.09751.78131.7813
H82.19131.09743.27113.09752.53521.78131.7813

picture of Ethyl iodide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 109.384 C1 C2 H7 111.087
C1 C2 H8 111.087 C2 C1 I3 113.325
C2 C1 H4 110.207 C2 C1 H5 110.207
I3 C1 H4 107.491 I3 C1 H5 107.491
H4 C1 H5 107.925 H6 C2 H7 108.353
H6 C2 H8 108.353 H7 C2 H8 108.496
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.214      
2 C -0.229      
3 I -0.013      
4 H 0.098      
5 H 0.098      
6 H 0.086      
7 H 0.088      
8 H 0.088      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.441 -1.873 0.000 1.924
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -39.132 -0.771 0.000
y -0.771 -37.375 0.000
z 0.000 0.000 -39.336
Traceless
 xyz
x -0.777 -0.771 0.000
y -0.771 1.860 0.000
z 0.000 0.000 -1.083
Polar
3z2-r2-2.165
x2-y2-1.758
xy-0.771
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.915 -0.565 0.000
y -0.565 4.723 0.000
z 0.000 0.000 1.732


<r2> (average value of r2) Å2
<r2> 132.947
(<r2>)1/2 11.530