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

using model chemistry: CISD/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 CISD/3-21G
 hartrees
Energy at 0K-359.124298
Energy at 298.15K-359.132088
HF Energy-358.809845
Nuclear repulsion energy148.416944
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 CISD/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' 3144 2960 0.00      
2 A' 3064 2884 0.00      
3 A' 1563 1471 0.00      
4 A' 1384 1303 0.00      
5 A' 683 643 0.00      
6 A' 523 492 0.00      
7 A" 3119 2936 59.47      
8 A" 1567 1475 8.99      
9 A" 834 785 145.17      
10 A" 195 183 12.14      
11 A" 47 44 0.02      
12 E' 3145 2960 31.47      
12 E' 3145 2960 31.47      
13 E' 3060 2880 12.80      
13 E' 3060 2880 12.80      
14 E' 1563 1471 1.73      
14 E' 1563 1471 1.73      
15 E' 1378 1297 45.64      
15 E' 1378 1297 45.64      
16 E' 850 801 170.37      
16 E' 850 801 170.37      
17 E' 672 632 18.37      
17 E' 672 632 18.37      
18 E' 171 161 5.24      
18 E' 171 161 5.24      
19 E" 3118 2935 0.00      
19 E" 3118 2935 0.00      
20 E" 1565 1473 0.00      
20 E" 1565 1473 0.00      
21 E" 670 631 0.00      
21 E" 670 631 0.00      
22 E" 25 23 0.00      
22 E" 25 23 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 24277.4 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 22852.3 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 CISD/3-21G
ABC
0.15923 0.15923 0.08330

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/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 2.007 0.000
C3 -1.738 -1.003 0.000
C4 1.738 -1.003 0.000
H5 -1.014 2.422 0.000
H6 -1.590 -2.089 0.000
H7 2.604 -0.333 0.000
H8 0.524 2.403 0.880
H9 0.524 2.403 -0.880
H10 -2.343 -0.747 0.880
H11 -2.343 -0.747 -0.880
H12 1.819 -1.655 0.880
H13 1.819 -1.655 -0.880

Atom - Atom Distances (Å)
  Al1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
Al12.00672.00672.00672.62542.62542.62542.61212.61212.61212.61212.61212.6121
C22.00673.47573.47571.09554.39353.50071.09841.09843.72143.72144.18254.1825
C32.00673.47573.47573.50071.09554.39354.18254.18251.09841.09843.72143.7214
C42.00673.47573.47574.39353.50071.09553.72143.72144.18254.18251.09841.0984
H52.62541.09553.50074.39354.54734.54731.77231.77233.54743.54745.04195.0419
H62.62544.39351.09553.50074.54734.54735.04195.04191.77231.77233.54743.5474
H72.62543.50074.39351.09554.54734.54733.54743.54745.04195.04191.77231.7723
H82.61211.09844.18253.72141.77235.04193.54741.76034.25964.60904.25964.6090
H92.61211.09844.18253.72141.77235.04193.54741.76034.60904.25964.60904.2596
H102.61213.72141.09844.18253.54741.77235.04194.25964.60901.76034.25964.6090
H112.61213.72141.09844.18253.54741.77235.04194.60904.25961.76034.60904.2596
H122.61214.18253.72141.09845.04193.54741.77234.25964.60904.25964.60901.7603
H132.61214.18253.72141.09845.04193.54741.77234.60904.25964.60904.25961.7603

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 112.261 Al1 C2 H8 111.137
Al1 C2 H9 111.137 Al1 C3 H6 112.261
Al1 C3 H10 111.137 Al1 C3 H11 111.137
Al1 C4 H7 112.261 Al1 C4 H12 111.137
Al1 C4 H13 111.137 C2 Al1 C3 120.000
C2 Al1 C4 120.000 C3 Al1 C4 120.000
H5 C2 H8 107.768 H5 C2 H9 107.768
H6 C3 H10 107.768 H6 C3 H11 107.768
H7 C4 H12 107.768 H7 C4 H13 107.768
H8 C2 H9 106.512 H10 C3 H11 106.512
H12 C4 H13 106.512
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability