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

using model chemistry: HF/CEP-121G

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/CEP-121G
 hartrees
Energy at 0K-23.582644
Energy at 298.15K-23.590535
HF Energy-23.582644
Nuclear repulsion energy55.802338
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/CEP-121G
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' 3209 2928 0.00      
2 A' 3103 2831 0.00      
3 A' 1586 1447 0.00      
4 A' 1401 1278 0.00      
5 A' 694 633 0.00      
6 A' 519 473 0.00      
7 A" 3177 2899 120.32      
8 A" 1589 1450 18.27      
9 A" 843 769 128.77      
10 A" 200 182 14.78      
11 A" 48 43 0.01      
12 E' 3210 2929 63.05      
12 E' 3210 2929 63.05      
13 E' 3100 2828 47.75      
13 E' 3100 2828 47.75      
14 E' 1584 1445 5.09      
14 E' 1584 1445 5.09      
15 E' 1398 1276 76.42      
15 E' 1398 1276 76.42      
16 E' 864 789 164.73      
16 E' 864 789 164.73      
17 E' 668 609 36.17      
17 E' 668 609 36.17      
18 E' 172 157 8.02      
18 E' 172 157 8.02      
19 E" 3176 2898 0.00      
19 E" 3176 2898 0.00      
20 E" 1589 1450 0.00      
20 E" 1589 1450 0.00      
21 E" 672 614 0.00      
21 E" 672 614 0.00      
22 E" 35 32 0.00      
22 E" 35 32 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24650.2 cm-1
Scaled (by 0.9125) Zero Point Vibrational Energy (zpe) 22493.3 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/CEP-121G
ABC
0.16248 0.16248 0.08501

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-121G

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.985 0.000
C3 -1.719 -0.992 0.000
C4 1.719 -0.992 0.000
H5 -1.003 2.408 0.000
H6 -1.584 -2.073 0.000
H7 2.587 -0.336 0.000
H8 0.525 2.379 0.873
H9 0.525 2.379 -0.873
H10 -2.323 -0.735 0.873
H11 -2.323 -0.735 -0.873
H12 1.798 -1.645 0.873
H13 1.798 -1.645 -0.873

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.98481.98481.98482.60892.60892.60892.58792.58792.58792.58792.58792.5879
C21.98483.43783.43781.08874.35593.47541.09231.09233.68143.68144.14314.1431
C31.98483.43783.43783.47541.08874.35594.14314.14311.09231.09233.68143.6814
C41.98483.43783.43784.35593.47541.08873.68143.68144.14314.14311.09231.0923
H52.60891.08873.47544.35594.51884.51881.76021.76023.51893.51895.00315.0031
H62.60894.35591.08873.47544.51884.51885.00315.00311.76021.76023.51893.5189
H72.60893.47544.35591.08874.51884.51883.51893.51895.00315.00311.76021.7602
H82.58791.09234.14313.68141.76025.00313.51891.74544.21994.56664.21994.5666
H92.58791.09234.14313.68141.76025.00313.51891.74544.56664.21994.56664.2199
H102.58793.68141.09234.14313.51891.76025.00314.21994.56661.74544.21994.5666
H112.58793.68141.09234.14313.51891.76025.00314.56664.21991.74544.56664.2199
H122.58794.14313.68141.09235.00313.51891.76024.21994.56664.21994.56661.7454
H132.58794.14313.68141.09235.00313.51891.76024.56664.21994.56664.21991.7454

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 112.899 Al1 C2 H8 111.154
Al1 C2 H9 111.154 Al1 C3 H6 112.899
Al1 C3 H10 111.154 Al1 C3 H11 111.154
Al1 C4 H7 112.899 Al1 C4 H12 111.154
Al1 C4 H13 111.154 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.618 H5 C2 H9 107.618
H6 C3 H10 107.618 H6 C3 H11 107.618
H7 C4 H12 107.618 H7 C4 H13 107.618
H8 C2 H9 106.070 H10 C3 H11 106.070
H12 C4 H13 106.070
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 1.311      
2 C -0.922      
3 C -0.922      
4 C -0.922      
5 H 0.160      
6 H 0.160      
7 H 0.160      
8 H 0.163      
9 H 0.163      
10 H 0.163      
11 H 0.163      
12 H 0.163      
13 H 0.163      


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 -37.377 0.000 0.000
y 0.000 -37.377 0.000
z 0.000 0.000 -30.029
Traceless
 xyz
x -3.674 0.000 0.000
y 0.000 -3.674 0.000
z 0.000 0.000 7.348
Polar
3z2-r214.696
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 8.762 0.000 0.000
y 0.000 8.762 0.000
z 0.000 0.000 6.700


<r2> (average value of r2) Å2
<r2> 129.694
(<r2>)1/2 11.388