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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: mPW1PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at mPW1PW91/6-31G*
 hartrees
Energy at 0K-153.787276
Energy at 298.15K-153.791185
HF Energy-153.787276
Nuclear repulsion energy69.717313
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 mPW1PW91/6-31G*
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' 3201 3035 7.87 51.67 0.72 0.83
2 A' 3073 2914 1.92 123.61 0.01 0.03
3 A' 2938 2786 133.53 125.69 0.35 0.51
4 A' 1875 1778 163.67 7.35 0.54 0.70
5 A' 1492 1415 19.03 22.84 0.69 0.82
6 A' 1453 1378 13.74 7.88 0.62 0.77
7 A' 1406 1333 23.40 5.79 0.75 0.85
8 A' 1146 1087 25.37 3.12 0.45 0.62
9 A' 908 861 7.00 5.60 0.39 0.57
10 A' 510 483 13.27 1.10 0.49 0.65
11 A" 3140 2978 6.42 70.57 0.75 0.86
12 A" 1502 1424 11.28 14.57 0.75 0.86
13 A" 1151 1091 1.63 0.93 0.75 0.86
14 A" 782 741 1.24 7.52 0.75 0.86
15 A" 154 146 0.30 1.08 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12364.6 cm-1
Scaled (by 0.9483) Zero Point Vibrational Energy (zpe) 11725.4 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 mPW1PW91/6-31G*
ABC
1.90542 0.33894 0.30392

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.462 0.000
C2 -0.932 -0.715 0.000
O3 1.204 0.382 0.000
H4 -0.499 1.455 0.000
H5 -0.368 -1.648 0.000
H6 -1.586 -0.672 0.879
H7 -1.586 -0.672 -0.879

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50131.20661.11182.14152.13832.1383
C21.50132.40172.21331.09071.09611.0961
O31.20662.40172.01262.56753.10903.1090
H41.11182.21332.01263.10622.54572.5457
H52.14151.09072.56753.10621.79121.7912
H62.13831.09613.10902.54571.79121.7584
H72.13831.09613.10902.54571.79121.7584

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.426 C1 C2 H6 109.846
C1 C2 H7 109.846 C2 C1 O3 124.617
C2 C1 H4 114.960 O3 C1 H4 120.423
H5 C2 H6 109.991 H5 C2 H7 109.991
H6 C2 H7 106.670
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.251      
2 C -0.606      
3 O -0.383      
4 H 0.127      
5 H 0.211      
6 H 0.200      
7 H 0.200      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.678 -0.298 0.000 2.695
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.424 -0.805 0.000
y -0.805 -17.607 0.000
z 0.000 0.000 -17.536
Traceless
 xyz
x -2.853 -0.805 0.000
y -0.805 1.374 0.000
z 0.000 0.000 1.479
Polar
3z2-r22.959
x2-y2-2.818
xy-0.805
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.347 0.111 0.000
y 0.111 3.594 0.000
z 0.000 0.000 2.558


<r2> (average value of r2) Å2
<r2> 46.592
(<r2>)1/2 6.826