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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: BLYP/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at BLYP/3-21G
 hartrees
Energy at 0K-152.923401
Energy at 298.15K-152.927287
HF Energy-152.923401
Nuclear repulsion energy68.328888
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 BLYP/3-21G
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' 3080 3063 12.59 49.31 0.68 0.81
2 A' 2964 2948 1.80 112.01 0.02 0.03
3 A' 2767 2752 156.82 121.40 0.35 0.52
4 A' 1681 1672 82.57 2.41 0.42 0.59
5 A' 1484 1476 22.48 26.72 0.71 0.83
6 A' 1414 1406 2.91 13.84 0.70 0.83
7 A' 1385 1377 32.41 10.19 0.71 0.83
8 A' 1097 1091 25.91 3.68 0.55 0.71
9 A' 839 835 16.61 5.38 0.34 0.50
10 A' 476 473 8.38 1.44 0.56 0.72
11 A" 3010 2993 8.27 68.55 0.75 0.86
12 A" 1504 1496 11.85 19.42 0.75 0.86
13 A" 1124 1117 1.27 1.07 0.75 0.86
14 A" 789 785 2.93 8.07 0.75 0.86
15 A" 166 166 0.01 1.30 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11890.2 cm-1
Scaled (by 0.9945) Zero Point Vibrational Energy (zpe) 11824.8 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 BLYP/3-21G
ABC
1.87128 0.32280 0.29043

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.959 -0.726 0.000
O3 1.239 0.393 0.000
H4 -0.537 1.447 0.000
H5 -0.394 -1.668 0.000
H6 -1.614 -0.675 0.889
H7 -1.614 -0.675 -0.889

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.52851.24091.12032.16862.16602.1660
C21.52852.46592.21401.09871.10561.1056
O31.24092.46592.06572.62903.17263.1726
H41.12032.21402.06573.11902.54012.5401
H52.16861.09872.62903.11901.80741.8074
H62.16601.10563.17262.54011.80741.7786
H72.16601.10563.17262.54011.80741.7786

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.196 C1 C2 H6 109.587
C1 C2 H7 109.587 C2 C1 O3 125.532
C2 C1 H4 112.497 O3 C1 H4 121.971
H5 C2 H6 110.157 H5 C2 H7 110.157
H6 C2 H7 107.103
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.230      
2 C -0.612      
3 O -0.373      
4 H 0.134      
5 H 0.209      
6 H 0.206      
7 H 0.206      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.354 -0.334 0.000 2.378
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.447 -0.675 0.000
y -0.675 -18.093 0.000
z 0.000 0.000 -17.789
Traceless
 xyz
x -2.506 -0.675 0.000
y -0.675 1.024 0.000
z 0.000 0.000 1.481
Polar
3z2-r22.962
x2-y2-2.353
xy-0.675
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.201 0.137 0.000
y 0.137 3.470 0.000
z 0.000 0.000 2.309


<r2> (average value of r2) Å2
<r2> 48.230
(<r2>)1/2 6.945