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

using model chemistry: HF/3-21G*

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/3-21G*
 hartrees
Energy at 0K-358.859849
Energy at 298.15K-358.867731
HF Energy-358.859849
Nuclear repulsion energy150.122020
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/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' 3217 2903 0.00      
2 A' 3139 2833 0.00      
3 A' 1630 1472 0.00      
4 A' 1427 1288 0.00      
5 A' 670 605 0.00      
6 A' 543 490 0.00      
7 A" 3186 2875 75.16      
8 A" 1633 1474 7.62      
9 A" 829 748 158.00      
10 A" 202 183 12.50      
11 A" 51 46 0.01      
12 E' 3217 2904 38.37      
12 E' 3217 2904 38.37      
13 E' 3137 2831 14.00      
13 E' 3137 2831 14.00      
14 E' 1629 1470 1.46      
14 E' 1629 1470 1.46      
15 E' 1425 1286 69.64      
15 E' 1425 1286 69.64      
16 E' 852 769 190.74      
16 E' 852 769 190.74      
17 E' 686 619 19.11      
17 E' 686 619 19.11      
18 E' 182 164 4.74      
18 E' 182 164 4.74      
19 E" 3185 2875 0.00      
19 E" 3185 2875 0.00      
20 E" 1632 1473 0.00      
20 E" 1632 1473 0.00      
21 E" 657 593 0.00      
21 E" 657 593 0.00      
22 E" 32 29 0.00      
22 E" 32 29 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24898.1 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 22473.0 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/3-21G*
ABC
0.16321 0.16321 0.08542

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

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.981 0.000
C3 -1.715 -0.990 0.000
C4 1.715 -0.990 0.000
H5 -1.004 2.400 0.000
H6 -1.577 -2.069 0.000
H7 2.580 -0.331 0.000
H8 0.524 2.371 0.874
H9 0.524 2.371 -0.874
H10 -2.315 -0.732 0.874
H11 -2.315 -0.732 -0.874
H12 1.792 -1.639 0.874
H13 1.792 -1.639 -0.874

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.98061.98061.98062.60162.60162.60162.58072.58072.58072.58072.58072.5807
C21.98063.43053.43051.08774.34603.46451.09101.09103.67193.67194.13234.1323
C31.98063.43053.43053.46451.08774.34604.13234.13231.09101.09103.67193.6719
C41.98063.43053.43054.34603.46451.08773.67193.67194.13234.13231.09101.0910
H52.60161.08773.46454.34604.50614.50611.75971.75973.50663.50664.98924.9892
H62.60164.34601.08773.46454.50614.50614.98924.98921.75971.75973.50663.5066
H72.60163.46454.34601.08774.50614.50613.50663.50664.98924.98921.75971.7597
H82.58071.09104.13233.67191.75974.98923.50661.74784.20594.55464.20594.5546
H92.58071.09104.13233.67191.75974.98923.50661.74784.55464.20594.55464.2059
H102.58073.67191.09104.13233.50661.75974.98924.20594.55461.74784.20594.5546
H112.58073.67191.09104.13233.50661.75974.98924.55464.20591.74784.55464.2059
H122.58074.13233.67191.09104.98923.50661.75974.20594.55464.20594.55461.7478
H132.58074.13233.67191.09104.98923.50661.75974.55464.20594.55464.20591.7478

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 112.693 Al1 C2 H8 110.973
Al1 C2 H9 110.973 Al1 C3 H6 112.693
Al1 C3 H10 110.973 Al1 C3 H11 110.973
Al1 C4 H7 112.693 Al1 C4 H12 110.973
Al1 C4 H13 110.973 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.739 H5 C2 H9 107.739
H6 C3 H10 107.739 H6 C3 H11 107.739
H7 C4 H12 107.739 H7 C4 H13 107.739
H8 C2 H9 106.447 H10 C3 H11 106.447
H12 C4 H13 106.447
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 1.138      
2 C -0.969      
3 C -0.969      
4 C -0.969      
5 H 0.198      
6 H 0.198      
7 H 0.198      
8 H 0.196      
9 H 0.196      
10 H 0.196      
11 H 0.196      
12 H 0.196      
13 H 0.196      


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 -37.469 0.000 0.000
y 0.000 -37.469 0.000
z 0.000 0.000 -30.961
Traceless
 xyz
x -3.254 0.000 0.000
y 0.000 -3.254 0.000
z 0.000 0.000 6.509
Polar
3z2-r213.017
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 7.550 0.000 0.000
y 0.000 7.550 0.000
z 0.000 0.000 6.101


<r2> (average value of r2) Å2
<r2> 152.925
(<r2>)1/2 12.366