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

using model chemistry: HF/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-360.780543
Energy at 298.15K-360.788203
HF Energy-360.780543
Nuclear repulsion energy150.655088
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/6-31G(2df,p)
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' 3212 2909 0.00      
2 A' 3131 2835 0.00      
3 A' 1567 1419 0.00      
4 A' 1356 1228 0.00      
5 A' 631 571 0.00      
6 A' 536 485 0.00      
7 A" 3185 2884 80.01      
8 A" 1573 1425 1.36      
9 A" 763 691 110.15      
10 A" 197 178 11.14      
11 A" 49 44 0.08      
12 E' 3214 2910 43.81      
12 E' 3214 2910 43.81      
13 E' 3129 2833 16.93      
13 E' 3129 2833 16.93      
14 E' 1566 1418 0.09      
14 E' 1566 1418 0.09      
15 E' 1353 1225 29.44      
15 E' 1353 1225 29.44      
16 E' 803 727 162.04      
16 E' 803 727 162.04      
17 E' 668 605 17.90      
17 E' 668 605 17.90      
18 E' 179 162 5.09      
18 E' 179 162 5.09      
19 E" 3184 2883 0.00      
19 E" 3184 2883 0.00      
20 E" 1571 1423 0.00      
20 E" 1571 1423 0.00      
21 E" 594 538 0.00      
21 E" 594 538 0.00      
22 E" 25 22 0.00      
22 E" 25 22 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24383.2 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 22079.0 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 HF/6-31G(2df,p)
ABC
0.16459 0.16459 0.08615

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.970 0.000
C3 -1.706 -0.985 0.000
C4 1.706 -0.985 0.000
H5 -0.997 2.405 0.000
H6 -1.584 -2.066 0.000
H7 2.581 -0.339 0.000
H8 0.527 2.362 0.871
H9 0.527 2.362 -0.871
H10 -2.309 -0.725 0.871
H11 -2.309 -0.725 -0.871
H12 1.782 -1.637 0.871
H13 1.782 -1.637 -0.871

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.97041.97041.97042.60332.60332.60332.57202.57202.57202.57202.57202.5720
C21.97043.41293.41291.08744.33603.46361.09041.09043.65443.65444.11704.1170
C31.97043.41293.41293.46361.08744.33604.11704.11701.09041.09043.65443.6544
C41.97043.41293.41294.33603.46361.08743.65443.65444.11704.11701.09041.0904
H52.60331.08743.46364.33604.50914.50911.75531.75533.50373.50374.98204.9820
H62.60334.33601.08743.46364.50914.50914.98204.98201.75531.75533.50373.5037
H72.60333.46364.33601.08744.50914.50913.50373.50374.98204.98201.75531.7553
H82.57201.09044.11703.65441.75534.98203.50371.74154.19184.53914.19184.5391
H92.57201.09044.11703.65441.75534.98203.50371.74154.53914.19184.53914.1918
H102.57203.65441.09044.11703.50371.75534.98204.19184.53911.74154.19184.5391
H112.57203.65441.09044.11703.50371.75534.98204.53914.19181.74154.53914.1918
H122.57204.11703.65441.09044.98203.50371.75534.19184.53914.19184.53911.7415
H132.57204.11703.65441.09044.98203.50371.75534.53914.19184.53914.19181.7415

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 113.551 Al1 C2 H8 111.053
Al1 C2 H9 111.053 Al1 C3 H6 113.551
Al1 C3 H10 111.053 Al1 C3 H11 111.053
Al1 C4 H7 113.551 Al1 C4 H12 111.053
Al1 C4 H13 111.053 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.411 H5 C2 H9 107.411
H6 C3 H10 107.411 H6 C3 H11 107.411
H7 C4 H12 107.411 H7 C4 H13 107.411
H8 C2 H9 105.982 H10 C3 H11 105.982
H12 C4 H13 105.982
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.724      
2 C -0.655      
3 C -0.655      
4 C -0.655      
5 H 0.140      
6 H 0.140      
7 H 0.140      
8 H 0.137      
9 H 0.137      
10 H 0.137      
11 H 0.137      
12 H 0.137      
13 H 0.137      


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 -37.228 0.000 0.000
y 0.000 -37.228 0.000
z 0.000 0.000 -30.833
Traceless
 xyz
x -3.197 0.000 0.000
y 0.000 -3.197 0.000
z 0.000 0.000 6.395
Polar
3z2-r212.789
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 8.367 0.000 0.000
y 0.000 8.367 0.000
z 0.000 0.000 6.774


<r2> (average value of r2) Å2
<r2> 151.829
(<r2>)1/2 12.322