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All results from a given calculation for Al(CH3)3 (trimethyl aluminum)

using model chemistry: B3LYP/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at B3LYP/CEP-31G*
 hartrees
Energy at 0K-24.389617
Energy at 298.15K-24.396918
HF Energy-24.389617
Nuclear repulsion energy55.452919
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 B3LYP/CEP-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3091 2985 0.00      
2 A' 3006 2903 0.00      
3 A' 1472 1421 0.00      
4 A' 1262 1218 0.00      
5 A' 585 565 0.00      
6 A' 509 491 0.00      
7 A" 3064 2958 101.72      
8 A" 1473 1422 11.59      
9 A" 721 696 99.34      
10 A" 182 175 6.93      
11 A" 44 43 0.03      
12 E' 3092 2986 58.78      
12 E' 3092 2986 58.81      
13 E' 3004 2901 18.41      
13 E' 3004 2901 18.41      
14 E' 1469 1419 3.42      
14 E' 1469 1419 3.42      
15 E' 1258 1215 57.02      
15 E' 1258 1215 57.01      
16 E' 759 733 167.00      
16 E' 759 733 167.01      
17 E' 637 615 12.38      
17 E' 637 615 12.37      
18 E' 167 162 4.25      
18 E' 167 162 4.25      
19 E" 3063 2958 0.00      
19 E" 3063 2958 0.00      
20 E" 1471 1420 0.00      
20 E" 1471 1420 0.00      
21 E" 555 536 0.00      
21 E" 555 536 0.00      
22 E" 15 14 0.00      
22 E" 15 14 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23191.5 cm-1
Scaled (by 0.9657) Zero Point Vibrational Energy (zpe) 22396.1 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 B3LYP/CEP-31G*
ABC
0.16208 0.16208 0.08490

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-31G*

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.983 0.000
C3 -1.717 -0.991 0.000
C4 1.717 -0.991 0.000
H5 -1.013 2.426 0.000
H6 -1.595 -2.090 0.000
H7 2.608 -0.336 0.000
H8 0.535 2.384 0.884
H9 0.535 2.384 -0.884
H10 -2.333 -0.729 0.884
H11 -2.333 -0.729 -0.884
H12 1.797 -1.656 0.884
H13 1.797 -1.656 -0.884

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.98301.98301.98302.62912.62912.62912.59872.59872.59872.59872.59872.5987
C21.98303.43463.43461.10574.37433.48941.10871.10873.68443.68444.15354.1535
C31.98303.43463.43463.48941.10574.37434.15354.15351.10871.10873.68443.6844
C41.98303.43463.43464.37433.48941.10573.68443.68444.15354.15351.10871.1087
H52.62911.10573.48944.37434.55374.55371.78341.78343.53203.53205.03395.0339
H62.62914.37431.10573.48944.55374.55375.03395.03391.78341.78343.53203.5320
H72.62913.48944.37431.10574.55374.55373.53203.53205.03395.03391.78341.7834
H82.59871.10874.15353.68441.78345.03393.53201.76814.23264.58704.23264.5870
H92.59871.10874.15353.68441.78345.03393.53201.76814.58704.23264.58704.2326
H102.59873.68441.10874.15353.53201.78345.03394.23264.58701.76814.23264.5870
H112.59873.68441.10874.15353.53201.78345.03394.58704.23261.76814.58704.2326
H122.59874.15353.68441.10875.03393.53201.78344.23264.58704.23264.58701.7681
H132.59874.15353.68441.10875.03393.53201.78344.58704.23264.58704.23261.7681

picture of trimethyl aluminum state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Al1 C2 H5 113.627 Al1 C2 H8 111.224
Al1 C2 H9 111.224 Al1 C3 H6 113.627
Al1 C3 H10 111.224 Al1 C3 H11 111.224
Al1 C4 H7 113.627 Al1 C4 H12 111.224
Al1 C4 H13 111.224 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.292 H5 C2 H9 107.292
H6 C3 H10 107.292 H6 C3 H11 107.292
H7 C4 H12 107.292 H7 C4 H13 107.292
H8 C2 H9 105.765 H10 C3 H11 105.765
H12 C4 H13 105.765
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.274      
2 C -0.594      
3 C -0.594      
4 C -0.594      
5 H 0.168      
6 H 0.168      
7 H 0.168      
8 H 0.167      
9 H 0.167      
10 H 0.167      
11 H 0.167      
12 H 0.167      
13 H 0.167      


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


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -35.113 0.000 0.000
y 0.000 -35.113 0.000
z 0.000 0.000 -29.345
Traceless
 xyz
x -2.884 0.000 0.000
y 0.000 -2.884 0.000
z 0.000 0.000 5.769
Polar
3z2-r211.538
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 8.589 0.000 0.000
y 0.000 8.587 0.000
z 0.000 0.000 6.902


<r2> (average value of r2) Å2
<r2> 129.171
(<r2>)1/2 11.365