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

using model chemistry: HF/CEP-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 HF/CEP-31G
 hartrees
Energy at 0K-23.569885
Energy at 298.15K-23.577700
HF Energy-23.569885
Nuclear repulsion energy55.695291
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-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' 3251 2930 0.00      
2 A' 3151 2840 0.00      
3 A' 1582 1426 0.00      
4 A' 1412 1272 0.00      
5 A' 684 616 0.00      
6 A' 518 467 0.00      
7 A" 3219 2901 178.18      
8 A" 1588 1432 17.42      
9 A" 834 752 127.74      
10 A" 198 178 12.84      
11 A" 49 44 0.04      
12 E' 3252 2931 93.08      
12 E' 3252 2931 93.08      
13 E' 3147 2837 68.17      
13 E' 3147 2837 68.17      
14 E' 1578 1422 4.71      
14 E' 1578 1422 4.71      
15 E' 1407 1268 77.67      
15 E' 1407 1268 77.67      
16 E' 858 773 159.75      
16 E' 858 773 159.75      
17 E' 666 600 42.92      
17 E' 666 600 42.92      
18 E' 176 159 8.68      
18 E' 176 159 8.68      
19 E" 3218 2900 0.00      
19 E" 3218 2900 0.00      
20 E" 1588 1431 0.00      
20 E" 1588 1431 0.00      
21 E" 658 593 0.00      
21 E" 658 593 0.00      
22 E" 32 29 0.00      
22 E" 32 29 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24821.1 cm-1
Scaled (by 0.9014) Zero Point Vibrational Energy (zpe) 22373.8 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-31G
ABC
0.16224 0.16224 0.08492

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-31G

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.985 0.000
C3 -1.719 -0.993 0.000
C4 1.719 -0.993 0.000
H5 -1.005 2.415 0.000
H6 -1.589 -2.078 0.000
H7 2.594 -0.337 0.000
H8 0.529 2.378 0.876
H9 0.529 2.378 -0.876
H10 -2.324 -0.731 0.876
H11 -2.324 -0.731 -0.876
H12 1.795 -1.648 0.876
H13 1.795 -1.648 -0.876

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.98551.98551.98552.61632.61632.61632.58952.58952.58952.58952.58952.5895
C21.98553.43903.43901.09334.36353.48231.09671.09673.68103.68104.14614.1461
C31.98553.43903.43903.48231.09334.36354.14614.14611.09671.09673.68103.6810
C41.98553.43903.43904.36353.48231.09333.68103.68104.14614.14611.09671.0967
H52.61631.09333.48234.36354.53154.53151.76751.76753.52263.52265.01195.0119
H62.61634.36351.09333.48234.53154.53155.01195.01191.76751.76753.52263.5226
H72.61633.48234.36351.09334.53154.53153.52263.52265.01195.01191.76751.7675
H82.58951.09674.14613.68101.76755.01193.52261.75294.22044.57004.22044.5700
H92.58951.09674.14613.68101.76755.01193.52261.75294.57004.22044.57004.2204
H102.58953.68101.09674.14613.52261.76755.01194.22044.57001.75294.22044.5700
H112.58953.68101.09674.14613.52261.76755.01194.57004.22041.75294.57004.2204
H122.58954.14613.68101.09675.01193.52261.76754.22044.57004.22044.57001.7529
H132.58954.14613.68101.09675.01193.52261.76754.57004.22044.57004.22041.7529

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 113.161 Al1 C2 H8 110.999
Al1 C2 H9 110.999 Al1 C3 H6 113.161
Al1 C3 H10 110.999 Al1 C3 H11 110.999
Al1 C4 H7 113.161 Al1 C4 H12 110.999
Al1 C4 H13 110.999 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.624 H5 C2 H9 107.624
H6 C3 H10 107.624 H6 C3 H11 107.624
H7 C4 H12 107.624 H7 C4 H13 107.624
H8 C2 H9 106.103 H10 C3 H11 106.103
H12 C4 H13 106.103
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.792      
2 C -0.705      
3 C -0.705      
4 C -0.705      
5 H 0.146      
6 H 0.146      
7 H 0.146      
8 H 0.148      
9 H 0.148      
10 H 0.148      
11 H 0.148      
12 H 0.148      
13 H 0.148      


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 -36.969 0.000 0.000
y 0.000 -36.969 0.000
z 0.000 0.000 -29.833
Traceless
 xyz
x -3.568 0.000 0.000
y 0.000 -3.568 0.000
z 0.000 0.000 7.136
Polar
3z2-r214.271
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 7.765 0.000 0.000
y 0.000 7.765 0.000
z 0.000 0.000 6.329


<r2> (average value of r2) Å2
<r2> 129.678
(<r2>)1/2 11.388