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

using model chemistry: B1B95/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at B1B95/6-31G*
 hartrees
Energy at 0K-362.096436
Energy at 298.15K-362.103802
HF Energy-362.096436
Nuclear repulsion energy150.582588
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 B1B95/6-31G*
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' 3143 2983 0.00      
2 A' 3046 2892 0.00      
3 A' 1483 1408 0.00      
4 A' 1270 1206 0.00      
5 A' 596 566 0.00      
6 A' 519 493 0.00      
7 A" 3115 2957 42.65      
8 A" 1486 1410 5.68      
9 A" 740 703 120.94      
10 A" 181 172 5.42      
11 A" 42 40 0.06      
12 E' 3143 2984 26.02      
12 E' 3143 2984 26.08      
13 E' 3045 2890 8.07      
13 E' 3045 2890 8.05      
14 E' 1481 1406 1.01      
14 E' 1481 1406 1.01      
15 E' 1266 1202 41.33      
15 E' 1266 1202 41.22      
16 E' 777 737 172.12      
16 E' 777 737 172.04      
17 E' 649 616 8.84      
17 E' 649 616 8.82      
18 E' 166 158 2.88      
18 E' 166 158 2.87      
19 E" 3115 2957 0.00      
19 E" 3115 2957 0.00      
20 E" 1483 1408 0.00      
20 E" 1483 1408 0.00      
21 E" 571 542 0.00      
21 E" 571 542 0.00      
22 E" 14 13 0.00      
22 E" 14 13 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23519.3 cm-1
Scaled (by 0.9493) Zero Point Vibrational Energy (zpe) 22326.9 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 B1B95/6-31G*
ABC
0.16481 0.16481 0.08632

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31G*

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.967 0.000
C3 -1.704 -0.984 0.000
C4 1.704 -0.984 0.000
H5 -1.004 2.403 0.000
H6 -1.579 -2.071 0.000
H7 2.583 -0.332 0.000
H8 0.530 2.364 0.875
H9 0.530 2.364 -0.875
H10 -2.312 -0.723 0.875
H11 -2.312 -0.723 -0.875
H12 1.782 -1.641 0.875
H13 1.782 -1.641 -0.875

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.96721.96721.96722.60392.60392.60392.57572.57572.57572.57572.57572.5757
C21.96723.40733.40731.09444.33563.45761.09731.09733.65383.65384.11814.1181
C31.96723.40733.40733.45761.09444.33564.11814.11811.09731.09733.65383.6538
C41.96723.40733.40734.33563.45761.09443.65383.65384.11814.11811.09731.0973
H52.60391.09443.45764.33564.51014.51011.76631.76633.49963.49964.98774.9877
H62.60394.33561.09443.45764.51014.51014.98774.98771.76631.76633.49963.4996
H72.60393.45764.33561.09444.51014.51013.49963.49964.98774.98771.76631.7663
H82.57571.09734.11813.65381.76634.98773.49961.75074.19574.54634.19574.5463
H92.57571.09734.11813.65381.76634.98773.49961.75074.54634.19574.54634.1957
H102.57573.65381.09734.11813.49961.76634.98774.19574.54631.75074.19574.5463
H112.57573.65381.09734.11813.49961.76634.98774.54634.19571.75074.54634.1957
H122.57574.11813.65381.09734.98773.49961.76634.19574.54634.19574.54631.7507
H132.57574.11813.65381.09734.98773.49961.76634.54634.19574.54634.19571.7507

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 113.439 Al1 C2 H8 111.191
Al1 C2 H9 111.191 Al1 C3 H6 113.439
Al1 C3 H10 111.191 Al1 C3 H11 111.191
Al1 C4 H7 113.439 Al1 C4 H12 111.191
Al1 C4 H13 111.191 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.397 H5 C2 H9 107.397
H6 C3 H10 107.397 H6 C3 H11 107.397
H7 C4 H12 107.397 H7 C4 H13 107.397
H8 C2 H9 105.835 H10 C3 H11 105.835
H12 C4 H13 105.835
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.753      
2 C -0.772      
3 C -0.772      
4 C -0.772      
5 H 0.175      
6 H 0.175      
7 H 0.175      
8 H 0.173      
9 H 0.173      
10 H 0.173      
11 H 0.173      
12 H 0.173      
13 H 0.173      


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 -35.835 0.000 0.000
y 0.000 -35.835 0.000
z 0.000 0.000 -30.833
Traceless
 xyz
x -2.501 0.000 0.000
y 0.000 -2.501 0.000
z 0.000 0.000 5.002
Polar
3z2-r210.004
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 8.638 -0.001 0.000
y -0.001 8.635 0.000
z 0.000 0.000 6.655


<r2> (average value of r2) Å2
<r2> 151.145
(<r2>)1/2 12.294