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

using model chemistry: B1B95/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3H 1A'
Energy calculated at B1B95/3-21G*
 hartrees
Energy at 0K-360.185431
Energy at 298.15K-360.193043
HF Energy-360.185431
Nuclear repulsion energy150.400124
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 B1B95/3-21G*
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' 3124 2983 0.00      
2 A' 3027 2890 0.00      
3 A' 1521 1452 0.00      
4 A' 1301 1243 0.00      
5 A' 624 596 0.00      
6 A' 533 509 0.00      
7 A" 3093 2954 37.73      
8 A" 1523 1454 8.09      
9 A" 781 746 150.49      
10 A" 183 175 5.17      
11 A" 50 48 0.08      
12 E' 3125 2984 23.48      
12 E' 3125 2984 23.56      
13 E' 3025 2889 6.10      
13 E' 3025 2889 6.09      
14 E' 1519 1450 1.71      
14 E' 1519 1450 1.73      
15 E' 1299 1240 64.28      
15 E' 1299 1240 64.15      
16 E' 808 772 187.84      
16 E' 808 772 187.75      
17 E' 672 641 7.13      
17 E' 672 641 7.08      
18 E' 169 161 2.37      
18 E' 169 161 2.36      
19 E" 3093 2954 0.00      
19 E" 3093 2954 0.00      
20 E" 1521 1452 0.00      
20 E" 1521 1452 0.00      
21 E" 612 585 0.00      
21 E" 612 585 0.00      
22 E" 25 24 0.00      
22 E" 25 24 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23747.7 cm-1
Scaled (by 0.9549) Zero Point Vibrational Energy (zpe) 22676.7 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 B1B95/3-21G*
ABC
0.16441 0.16441 0.08614

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G*

Point Group is C3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 0.000
C2 0.000 1.971 0.000
C3 -1.707 -0.986 0.000
C4 1.707 -0.986 0.000
H5 -1.011 2.394 0.000
H6 -1.568 -2.072 0.000
H7 2.579 -0.322 0.000
H8 0.530 2.361 0.880
H9 0.530 2.361 -0.880
H10 -2.309 -0.721 0.880
H11 -2.309 -0.721 -0.880
H12 1.779 -1.639 0.880
H13 1.779 -1.639 -0.880

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.97121.97121.97122.59862.59862.59862.57452.57452.57452.57452.57452.5745
C21.97123.41433.41431.09564.33693.45051.09891.09893.65473.65474.12044.1204
C31.97123.41433.41433.45051.09564.33694.12044.12041.09891.09893.65473.6547
C41.97123.41433.41434.33693.45051.09563.65473.65474.12044.12041.09891.0989
H52.59861.09563.45054.33694.50094.50091.77501.77503.48783.48784.98264.9826
H62.59864.33691.09563.45054.50094.50094.98264.98261.77501.77503.48783.4878
H72.59863.45054.33691.09564.50094.50093.48783.48784.98264.98261.77501.7750
H82.57451.09894.12043.65471.77504.98263.48781.76064.19044.54524.19044.5452
H92.57451.09894.12043.65471.77504.98263.48781.76064.54524.19044.54524.1904
H102.57453.65471.09894.12043.48781.77504.98264.19044.54521.76064.19044.5452
H112.57453.65471.09894.12043.48781.77504.98264.54524.19041.76064.54524.1904
H122.57454.12043.65471.09894.98263.48781.77504.19044.54524.19044.54521.7606
H132.57454.12043.65471.09894.98263.48781.77504.54524.19044.54524.19041.7606

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 112.693 Al1 C2 H8 110.747
Al1 C2 H9 110.747 Al1 C3 H6 112.693
Al1 C3 H10 110.747 Al1 C3 H11 110.747
Al1 C4 H7 112.693 Al1 C4 H12 110.747
Al1 C4 H13 110.747 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.968 H5 C2 H9 107.968
H6 C3 H10 107.968 H6 C3 H11 107.968
H7 C4 H12 107.968 H7 C4 H13 107.968
H8 C2 H9 106.463 H10 C3 H11 106.463
H12 C4 H13 106.463
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Al 0.953      
2 C -0.939      
3 C -0.939      
4 C -0.939      
5 H 0.209      
6 H 0.209      
7 H 0.209      
8 H 0.207      
9 H 0.207      
10 H 0.207      
11 H 0.207      
12 H 0.207      
13 H 0.207      


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 -35.623 0.000 0.000
y 0.000 -35.623 0.000
z 0.000 0.000 -30.833
Traceless
 xyz
x -2.395 0.000 0.000
y 0.000 -2.395 0.000
z 0.000 0.000 4.789
Polar
3z2-r29.579
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 8.127 -0.001 0.000
y -0.001 8.126 0.000
z 0.000 0.000 6.376


<r2> (average value of r2) Å2
<r2> 151.223
(<r2>)1/2 12.297