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

using model chemistry: B3PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at B3PW91/3-21G
 hartrees
Energy at 0K-360.139539
Energy at 298.15K-360.147343
HF Energy-360.139539
Nuclear repulsion energy149.159722
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 B3PW91/3-21G
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' 3122 3001 0.00      
2 A' 3026 2908 0.00      
3 A' 1522 1463 0.00      
4 A' 1317 1266 0.00      
5 A' 664 638 0.00      
6 A' 521 501 0.00      
7 A" 3092 2972 39.04      
8 A" 1525 1466 12.59      
9 A" 812 781 154.93      
10 A" 189 182 6.98      
11 A" 63 61 0.13      
12 E' 3122 3001 23.24      
12 E' 3122 3001 23.23      
13 E' 3024 2907 7.93      
13 E' 3024 2907 7.93      
14 E' 1520 1461 3.23      
14 E' 1520 1461 3.23      
15 E' 1312 1261 64.68      
15 E' 1312 1261 64.67      
16 E' 831 798 177.21      
16 E' 831 798 177.21      
17 E' 670 644 11.91      
17 E' 670 644 11.90      
18 E' 167 161 3.43      
18 E' 167 161 3.43      
19 E" 3092 2972 0.00      
19 E" 3092 2972 0.00      
20 E" 1523 1464 0.00      
20 E" 1523 1464 0.00      
21 E" 652 627 0.00      
21 E" 652 627 0.00      
22 E" 43 41 0.00      
22 E" 43 41 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23882.8 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 22956.2 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 B3PW91/3-21G
ABC
0.16128 0.16128 0.08444

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.992 0.000
C3 -1.725 -0.996 0.000
C4 1.725 -0.996 0.000
H5 -1.015 2.410 0.000
H6 -1.580 -2.084 0.000
H7 2.594 -0.326 0.000
H8 0.528 2.386 0.882
H9 0.528 2.386 -0.882
H10 -2.330 -0.735 0.882
H11 -2.330 -0.735 -0.882
H12 1.802 -1.650 0.882
H13 1.802 -1.650 -0.882

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.99221.99221.99222.61492.61492.61492.59762.59762.59762.59762.59762.5976
C21.99223.45053.45051.09744.37143.47941.10071.10073.69393.69394.15844.1584
C31.99223.45053.45053.47941.09744.37144.15844.15841.10071.10073.69393.6939
C41.99223.45053.45054.37143.47941.09743.69393.69394.15844.15841.10071.1007
H52.61491.09743.47944.37144.52914.52911.77751.77753.52133.52135.01965.0196
H62.61494.37141.09743.47944.52914.52915.01965.01961.77751.77753.52133.5213
H72.61493.47944.37141.09744.52914.52913.52133.52135.01965.01961.77751.7775
H82.59761.10074.15843.69391.77755.01963.52131.76354.23204.58474.23204.5847
H92.59761.10074.15843.69391.77755.01963.52131.76354.58474.23204.58474.2320
H102.59763.69391.10074.15843.52131.77755.01964.23204.58471.76354.23204.5847
H112.59763.69391.10074.15843.52131.77755.01964.58474.23201.76354.58474.2320
H122.59764.15843.69391.10075.01963.52131.77754.23204.58474.23204.58471.7635
H132.59764.15843.69391.10075.01963.52131.77754.58474.23204.58474.23201.7635

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 112.380 Al1 C2 H8 110.939
Al1 C2 H9 110.939 Al1 C3 H6 112.380
Al1 C3 H10 110.939 Al1 C3 H11 110.939
Al1 C4 H7 112.380 Al1 C4 H12 110.939
Al1 C4 H13 110.939 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.933 H5 C2 H9 107.933
H6 C3 H10 107.933 H6 C3 H11 107.933
H7 C4 H12 107.933 H7 C4 H13 107.933
H8 C2 H9 106.468 H10 C3 H11 106.468
H12 C4 H13 106.468
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 1.159      
2 C -1.044      
3 C -1.044      
4 C -1.044      
5 H 0.220      
6 H 0.220      
7 H 0.220      
8 H 0.219      
9 H 0.219      
10 H 0.219      
11 H 0.219      
12 H 0.219      
13 H 0.219      


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 -36.325 0.000 0.000
y 0.000 -36.325 0.000
z 0.000 0.000 -30.889
Traceless
 xyz
x -2.718 0.000 0.000
y 0.000 -2.718 0.000
z 0.000 0.000 5.435
Polar
3z2-r210.871
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 8.281 0.000 0.000
y 0.000 8.280 0.000
z 0.000 0.000 6.283


<r2> (average value of r2) Å2
<r2> 153.991
(<r2>)1/2 12.409