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

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-361.259291
Energy at 298.15K-361.266778
HF Energy-360.754095
Nuclear repulsion energy150.001721
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 QCISD/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3126 2977 0.00      
2 A' 3036 2891 0.00      
3 A' 1505 1434 0.00      
4 A' 1319 1256 0.00      
5 A' 621 592 0.00      
6 A' 520 495 0.00      
7 A" 3101 2954 60.80      
8 A" 1508 1436 5.23      
9 A" 765 729 120.64      
10 A" 187 178 7.71      
11 A" 37 35 0.01      
12 E' 3127 2978 34.23      
12 E' 3127 2978 34.23      
13 E' 3035 2890 12.00      
13 E' 3035 2890 12.00      
14 E' 1504 1432 0.78      
14 E' 1504 1432 0.78      
15 E' 1314 1251 34.79      
15 E' 1314 1251 34.79      
16 E' 800 762 162.72      
16 E' 800 762 162.72      
17 E' 656 624 13.53      
17 E' 656 624 13.53      
18 E' 170 161 3.75      
18 E' 170 161 3.75      
19 E" 3101 2953 0.00      
19 E" 3101 2953 0.00      
20 E" 1506 1434 0.00      
20 E" 1506 1434 0.00      
21 E" 590 562 0.00      
21 E" 590 562 0.00      
22 E" 20 19 0.00      
22 E" 20 19 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 23685.0 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 22555.2 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 QCISD/6-31G*
ABC
0.16350 0.16350 0.08562

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/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 1.975 0.000
C3 -1.710 -0.987 0.000
C4 1.710 -0.987 0.000
H5 -1.008 2.411 0.000
H6 -1.584 -2.078 0.000
H7 2.592 -0.333 0.000
H8 0.530 2.376 0.878
H9 0.530 2.376 -0.878
H10 -2.322 -0.729 0.878
H11 -2.322 -0.729 -0.878
H12 1.793 -1.646 0.878
H13 1.793 -1.646 -0.878

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al11.97501.97501.97502.61332.61332.61332.58742.58742.58742.58742.58742.5874
C21.97503.42073.42071.09804.35183.47061.10071.10073.67093.67094.13504.1350
C31.97503.42073.42073.47061.09804.35184.13504.13501.10071.10073.67093.6709
C41.97503.42073.42074.35183.47061.09803.67093.67094.13504.13501.10071.1007
H52.61331.09803.47064.35184.52634.52631.77051.77053.51583.51585.00765.0076
H62.61334.35181.09803.47064.52634.52635.00765.00761.77051.77053.51583.5158
H72.61333.47064.35181.09804.52634.52633.51583.51585.00765.00761.77051.7705
H82.58741.10074.13503.67091.77055.00763.51581.75584.21564.56674.21564.5667
H92.58741.10074.13503.67091.77055.00763.51581.75584.56674.21564.56674.2156
H102.58743.67091.10074.13503.51581.77055.00764.21564.56671.75584.21564.5667
H112.58743.67091.10074.13503.51581.77055.00764.56674.21561.75584.56674.2156
H122.58744.13503.67091.10075.00763.51581.77054.21564.56674.21564.56671.7558
H132.58744.13503.67091.10075.00763.51581.77054.56674.21564.56674.21561.7558

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 113.408 Al1 C2 H8 111.345
Al1 C2 H9 111.345 Al1 C3 H6 113.408
Al1 C3 H10 111.345 Al1 C3 H11 111.345
Al1 C4 H7 113.408 Al1 C4 H12 111.345
Al1 C4 H13 111.345 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.270 H5 C2 H9 107.270
H6 C3 H10 107.270 H6 C3 H11 107.270
H7 C4 H12 107.270 H7 C4 H13 107.270
H8 C2 H9 105.796 H10 C3 H11 105.796
H12 C4 H13 105.796
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability