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

using model chemistry: B3LYP/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 B3LYP/3-21G
 hartrees
Energy at 0K-360.229884
Energy at 298.15K-360.237678
HF Energy-360.229884
Nuclear repulsion energy149.117692
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/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' 3105 2996 0.00      
2 A' 3018 2912 0.00      
3 A' 1529 1476 0.00      
4 A' 1325 1279 0.00      
5 A' 665 642 0.00      
6 A' 517 499 0.00      
7 A" 3075 2967 47.21      
8 A" 1533 1480 9.13      
9 A" 812 783 144.16      
10 A" 188 182 7.11      
11 A" 62 60 0.10      
12 E' 3106 2997 27.12      
12 E' 3106 2997 27.13      
13 E' 3017 2911 9.95      
13 E' 3017 2911 9.95      
14 E' 1528 1474 2.20      
14 E' 1528 1474 2.20      
15 E' 1320 1274 51.53      
15 E' 1320 1274 51.53      
16 E' 830 801 170.36      
16 E' 830 801 170.35      
17 E' 665 642 13.26      
17 E' 665 642 13.26      
18 E' 168 162 3.62      
18 E' 168 162 3.61      
19 E" 3074 2966 0.00      
19 E" 3074 2966 0.00      
20 E" 1531 1477 0.00      
20 E" 1531 1477 0.00      
21 E" 650 627 0.00      
21 E" 650 627 0.00      
22 E" 42 41 0.00      
22 E" 42 41 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23846.6 cm-1
Scaled (by 0.9649) Zero Point Vibrational Energy (zpe) 23009.6 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/3-21G
ABC
0.16112 0.16112 0.08434

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/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 1.993 0.000
C3 -1.726 -0.997 0.000
C4 1.726 -0.997 0.000
H5 -1.013 2.412 0.000
H6 -1.582 -2.084 0.000
H7 2.596 -0.328 0.000
H8 0.528 2.387 0.881
H9 0.528 2.387 -0.881
H10 -2.331 -0.736 0.881
H11 -2.331 -0.736 -0.881
H12 1.803 -1.651 0.881
H13 1.803 -1.651 -0.881

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.99341.99331.99332.61632.61632.61632.59832.59832.59832.59832.59832.5983
C21.99343.45263.45261.09654.37323.48251.09981.09983.69593.69594.16004.1600
C31.99333.45263.45263.48251.09654.37324.16004.16001.09981.09983.69593.6959
C41.99333.45263.45264.37323.48251.09653.69593.69594.16004.16001.09981.0998
H52.61631.09653.48254.37324.53154.53151.77561.77563.52463.52465.02135.0213
H62.61634.37321.09653.48254.53154.53155.02135.02131.77561.77563.52463.5246
H72.61633.48254.37321.09654.53154.53153.52463.52465.02135.02131.77561.7756
H82.59831.09984.16003.69591.77565.02133.52461.76194.23394.58594.23394.5859
H92.59831.09984.16003.69591.77565.02133.52461.76194.58594.23394.58594.2339
H102.59833.69591.09984.16003.52461.77565.02134.23394.58591.76194.23394.5859
H112.59833.69591.09984.16003.52461.77565.02134.58594.23391.76194.58594.2339
H122.59834.16003.69591.09985.02133.52461.77564.23394.58594.23394.58591.7619
H132.59834.16003.69591.09985.02133.52461.77564.58594.23394.58594.23391.7619

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 112.448 Al1 C2 H8 110.957
Al1 C2 H9 110.957 Al1 C3 H6 112.448
Al1 C3 H10 110.957 Al1 C3 H11 110.957
Al1 C4 H7 112.448 Al1 C4 H12 110.957
Al1 C4 H13 110.957 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.887 H5 C2 H9 107.887
H6 C3 H10 107.887 H6 C3 H11 107.887
H7 C4 H12 107.887 H7 C4 H13 107.887
H8 C2 H9 106.452 H10 C3 H11 106.451
H12 C4 H13 106.451
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 1.113      
2 C -0.967      
3 C -0.967      
4 C -0.967      
5 H 0.199      
6 H 0.199      
7 H 0.199      
8 H 0.198      
9 H 0.198      
10 H 0.198      
11 H 0.198      
12 H 0.198      
13 H 0.198      


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 -36.596 0.000 0.000
y 0.000 -36.596 0.000
z 0.000 0.000 -31.100
Traceless
 xyz
x -2.748 0.000 0.000
y 0.000 -2.748 0.000
z 0.000 0.000 5.496
Polar
3z2-r210.993
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 8.315 0.000 0.000
y 0.000 8.315 0.000
z 0.000 0.000 6.272


<r2> (average value of r2) Å2
<r2> 154.277
(<r2>)1/2 12.421