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

using model chemistry: HF/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at HF/6-31+G**
 hartrees
Energy at 0K-360.774445
Energy at 298.15K-360.782120
HF Energy-360.774445
Nuclear repulsion energy150.189232
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 HF/6-31+G**
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' 3224 2916 0.00      
2 A' 3142 2841 0.00      
3 A' 1572 1421 0.00      
4 A' 1363 1233 0.00      
5 A' 640 578 0.00      
6 A' 530 479 0.00      
7 A" 3197 2891 93.27      
8 A" 1575 1424 8.50      
9 A" 778 703 102.56      
10 A" 194 175 15.00      
11 A" 48 43 0.03      
12 E' 3225 2916 48.90      
12 E' 3225 2916 48.90      
13 E' 3140 2839 30.18      
13 E' 3140 2839 30.18      
14 E' 1570 1420 1.40      
14 E' 1570 1420 1.40      
15 E' 1360 1229 51.08      
15 E' 1360 1229 51.08      
16 E' 813 735 156.79      
16 E' 813 735 156.79      
17 E' 666 602 24.68      
17 E' 666 602 24.68      
18 E' 177 160 6.98      
18 E' 177 160 6.98      
19 E" 3197 2890 0.00      
19 E" 3197 2890 0.00      
20 E" 1575 1424 0.00      
20 E" 1575 1424 0.00      
21 E" 609 551 0.00      
21 E" 609 551 0.00      
22 E" 25 23 0.00      
22 E" 25 23 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24487.6 cm-1
Scaled (by 0.9042) Zero Point Vibrational Energy (zpe) 22141.7 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 HF/6-31+G**
ABC
0.16337 0.16337 0.08549

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

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.979 0.000
C3 -1.714 -0.989 0.000
C4 1.714 -0.989 0.000
H5 -1.000 2.407 0.000
H6 -1.585 -2.069 0.000
H7 2.584 -0.338 0.000
H8 0.525 2.372 0.871
H9 0.525 2.372 -0.871
H10 -2.317 -0.732 0.871
H11 -2.317 -0.732 -0.871
H12 1.792 -1.640 0.871
H13 1.792 -1.640 -0.871

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.97881.97881.97882.60632.60632.60632.58092.58092.58092.58092.58092.5809
C21.97883.42743.42741.08764.34723.47051.09041.09043.67053.67054.13154.1315
C31.97883.42743.42743.47051.08764.34724.13154.13151.09041.09043.67053.6705
C41.97883.42743.42744.34723.47051.08763.67053.67054.13154.13151.09041.0904
H52.60631.08763.47054.34724.51424.51421.75621.75623.51343.51344.99334.9933
H62.60634.34721.08763.47054.51424.51424.99334.99331.75621.75623.51343.5134
H72.60633.47054.34721.08764.51424.51423.51343.51344.99334.99331.75621.7562
H82.58091.09044.13153.67051.75624.99333.51341.74264.20784.55444.20784.5544
H92.58091.09044.13153.67051.75624.99333.51341.74264.55444.20784.55444.2078
H102.58093.67051.09044.13153.51341.75624.99334.20784.55441.74264.20784.5544
H112.58093.67051.09044.13153.51341.75624.99334.55444.20781.74264.55444.2078
H122.58094.13153.67051.09044.99333.51341.75624.20784.55444.20784.55441.7426
H132.58094.13153.67051.09044.99333.51341.75624.55444.20784.55444.20781.7426

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 113.177 Al1 C2 H8 111.139
Al1 C2 H9 111.139 Al1 C3 H6 113.177
Al1 C3 H10 111.139 Al1 C3 H11 111.139
Al1 C4 H7 113.177 Al1 C4 H12 111.139
Al1 C4 H13 111.139 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.479 H5 C2 H9 107.479
H6 C3 H10 107.479 H6 C3 H11 107.479
H7 C4 H12 107.479 H7 C4 H13 107.479
H8 C2 H9 106.078 H10 C3 H11 106.078
H12 C4 H13 106.079
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 1.027      
2 C -0.742      
3 C -0.742      
4 C -0.742      
5 H 0.137      
6 H 0.137      
7 H 0.137      
8 H 0.131      
9 H 0.131      
10 H 0.131      
11 H 0.131      
12 H 0.131      
13 H 0.131      


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 -38.665 0.000 0.000
y 0.000 -38.665 0.000
z 0.000 0.000 -31.238
Traceless
 xyz
x -3.713 0.000 0.000
y 0.000 -3.713 0.000
z 0.000 0.000 7.427
Polar
3z2-r214.853
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 9.060 0.000 0.000
y 0.000 9.060 0.000
z 0.000 0.000 6.823


<r2> (average value of r2) Å2
<r2> 153.432
(<r2>)1/2 12.387