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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-23.630663
Energy at 298.15K-23.638271
HF Energy-23.630663
Nuclear repulsion energy55.697650
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' 3247 2916 0.00      
2 A' 3167 2844 0.00      
3 A' 1590 1428 0.00      
4 A' 1378 1238 0.00      
5 A' 628 564 0.00      
6 A' 528 474 0.00      
7 A" 3220 2892 160.98      
8 A" 1593 1431 7.88      
9 A" 769 691 94.64      
10 A" 194 174 13.22      
11 A" 47 42 0.03      
12 E' 3248 2917 84.19      
12 E' 3248 2917 84.19      
13 E' 3165 2842 40.14      
13 E' 3165 2842 40.14      
14 E' 1588 1426 1.95      
14 E' 1588 1426 1.95      
15 E' 1375 1234 40.77      
15 E' 1375 1234 40.77      
16 E' 805 723 150.48      
16 E' 805 723 150.48      
17 E' 664 596 21.15      
17 E' 664 596 21.15      
18 E' 175 157 6.64      
18 E' 175 157 6.64      
19 E" 3219 2891 0.00      
19 E" 3219 2891 0.00      
20 E" 1592 1429 0.00      
20 E" 1592 1429 0.00      
21 E" 595 534 0.00      
21 E" 595 534 0.00      
22 E" 26 23 0.00      
22 E" 26 23 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24630.3 cm-1
Scaled (by 0.898) Zero Point Vibrational Energy (zpe) 22118.0 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/CEP-31G*
ABC
0.16239 0.16239 0.08500

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 1.984 0.000
C3 -1.718 -0.992 0.000
C4 1.718 -0.992 0.000
H5 -1.004 2.418 0.000
H6 -1.592 -2.079 0.000
H7 2.597 -0.339 0.000
H8 0.528 2.379 0.877
H9 0.528 2.379 -0.877
H10 -2.324 -0.732 0.877
H11 -2.324 -0.732 -0.877
H12 1.796 -1.647 0.877
H13 1.796 -1.647 -0.877

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.98381.98381.98382.61862.61862.61862.58982.58982.58982.58982.58982.5898
C21.98383.43613.43611.09434.36363.48421.09711.09713.68053.68054.14464.1446
C31.98383.43613.43613.48421.09434.36364.14464.14461.09711.09713.68053.6805
C41.98383.43613.43614.36363.48421.09433.68053.68054.14464.14461.09711.0971
H52.61861.09433.48424.36364.53564.53561.76611.76613.52633.52635.01385.0138
H62.61864.36361.09433.48424.53564.53565.01385.01381.76611.76613.52633.5263
H72.61863.48424.36361.09434.53564.53563.52633.52635.01385.01381.76611.7661
H82.58981.09714.14463.68051.76615.01383.52631.75304.22094.57044.22094.5704
H92.58981.09714.14463.68051.76615.01383.52631.75304.57044.22094.57044.2209
H102.58983.68051.09714.14463.52631.76615.01384.22094.57041.75304.22094.5704
H112.58983.68051.09714.14463.52631.76615.01384.57044.22091.75304.57044.2209
H122.58984.14463.68051.09715.01383.52631.76614.22094.57044.22094.57041.7530
H132.58984.14463.68051.09715.01383.52631.76614.57044.22094.57044.22091.7530

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 113.398 Al1 C2 H8 111.108
Al1 C2 H9 111.108 Al1 C3 H6 113.398
Al1 C3 H10 111.108 Al1 C3 H11 111.108
Al1 C4 H7 113.398 Al1 C4 H12 111.108
Al1 C4 H13 111.108 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.401 H5 C2 H9 107.401
H6 C3 H10 107.401 H6 C3 H11 107.401
H7 C4 H12 107.401 H7 C4 H13 107.401
H8 C2 H9 106.056 H10 C3 H11 106.056
H12 C4 H13 106.056
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 0.305      
2 C -0.506      
3 C -0.506      
4 C -0.506      
5 H 0.137      
6 H 0.137      
7 H 0.137      
8 H 0.134      
9 H 0.134      
10 H 0.134      
11 H 0.134      
12 H 0.134      
13 H 0.134      


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 -36.259 0.000 0.000
y 0.000 -36.259 0.000
z 0.000 0.000 -29.227
Traceless
 xyz
x -3.516 0.000 0.000
y 0.000 -3.516 0.000
z 0.000 0.000 7.032
Polar
3z2-r214.065
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 7.827 0.000 0.000
y 0.000 7.827 0.000
z 0.000 0.000 6.500


<r2> (average value of r2) Å2
<r2> 129.223
(<r2>)1/2 11.368