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

using model chemistry: B3PW91/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at B3PW91/6-31G**
 hartrees
Energy at 0K-362.108612
Energy at 298.15K-362.116017
HF Energy-362.108612
Nuclear repulsion energy150.323824
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 B3PW91/6-31G**
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' 3134 3004 0.00      
2 A' 3036 2909 0.00      
3 A' 1463 1402 0.00      
4 A' 1253 1201 0.00      
5 A' 599 574 0.00      
6 A' 512 491 0.00      
7 A" 3108 2979 42.11      
8 A" 1467 1406 4.63      
9 A" 738 707 118.22      
10 A" 183 176 5.32      
11 A" 44 42 0.06      
12 E' 3135 3004 25.89      
12 E' 3135 3004 25.89      
13 E' 3034 2908 8.77      
13 E' 3034 2908 8.77      
14 E' 1461 1400 0.64      
14 E' 1461 1400 0.64      
15 E' 1249 1197 38.74      
15 E' 1249 1197 38.74      
16 E' 774 742 168.48      
16 E' 774 742 168.48      
17 E' 642 616 11.25      
17 E' 642 616 11.25      
18 E' 170 163 2.89      
18 E' 170 163 2.89      
19 E" 3108 2979 0.00      
19 E" 3108 2979 0.00      
20 E" 1464 1404 0.00      
20 E" 1464 1404 0.00      
21 E" 571 547 0.00      
21 E" 571 547 0.00      
22 E" 19 18 0.00      
22 E" 19 18 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23393.7 cm-1
Scaled (by 0.9584) Zero Point Vibrational Energy (zpe) 22420.5 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 B3PW91/6-31G**
ABC
0.16418 0.16418 0.08597

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G**

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.971 0.000
C3 -1.707 -0.986 0.000
C4 1.707 -0.986 0.000
H5 -1.005 2.408 0.000
H6 -1.583 -2.074 0.000
H7 2.587 -0.334 0.000
H8 0.530 2.367 0.876
H9 0.530 2.367 -0.876
H10 -2.316 -0.724 0.876
H11 -2.316 -0.724 -0.876
H12 1.785 -1.643 0.876
H13 1.785 -1.643 -0.876

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.97141.97141.97142.60872.60872.60872.57942.57942.57942.57942.57942.5794
C21.97143.41453.41451.09514.34373.46531.09801.09803.66003.66004.12534.1253
C31.97143.41453.41453.46531.09514.34374.12534.12531.09801.09803.66003.6600
C41.97143.41453.41454.34373.46531.09513.66003.66004.12534.12531.09801.0980
H52.60871.09513.46534.34374.51844.51841.76781.76783.50643.50644.99574.9957
H62.60874.34371.09513.46534.51844.51844.99574.99571.76781.76783.50643.5064
H72.60873.46534.34371.09514.51844.51843.50643.50644.99574.99571.76781.7678
H82.57941.09804.12533.66001.76784.99573.50641.75184.20224.55284.20224.5528
H92.57941.09804.12533.66001.76784.99573.50641.75184.55284.20224.55284.2022
H102.57943.66001.09804.12533.50641.76784.99574.20224.55281.75184.20224.5528
H112.57943.66001.09804.12533.50641.76784.99574.55284.20221.75184.55284.2022
H122.57944.12533.66001.09804.99573.50641.76784.20224.55284.20224.55281.7518
H132.57944.12533.66001.09804.99573.50641.76784.55284.20224.55284.20221.7518

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 113.471 Al1 C2 H8 111.146
Al1 C2 H9 111.146 Al1 C3 H6 113.471
Al1 C3 H10 111.146 Al1 C3 H11 111.146
Al1 C4 H7 113.471 Al1 C4 H12 111.146
Al1 C4 H13 111.146 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.428 H5 C2 H9 107.428
H6 C3 H10 107.428 H6 C3 H11 107.428
H7 C4 H12 107.428 H7 C4 H13 107.428
H8 C2 H9 105.834 H10 C3 H11 105.834
H12 C4 H13 105.834
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.755      
2 C -0.662      
3 C -0.662      
4 C -0.662      
5 H 0.138      
6 H 0.138      
7 H 0.138      
8 H 0.136      
9 H 0.136      
10 H 0.136      
11 H 0.136      
12 H 0.136      
13 H 0.136      


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 -35.790 0.000 0.000
y 0.000 -35.790 0.000
z 0.000 0.000 -30.820
Traceless
 xyz
x -2.485 0.000 0.000
y 0.000 -2.485 0.000
z 0.000 0.000 4.970
Polar
3z2-r29.940
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 8.742 0.000 0.000
y 0.000 8.741 0.000
z 0.000 0.000 6.768


<r2> (average value of r2) Å2
<r2> 151.611
(<r2>)1/2 12.313