Difluoroamine,
NHF2 Molecule
The models presented are built using the best ab initio level of theory. The highest level of theory which is the large DVZ basis set of the molecule.
The bond lengths vary from basis to basis which provides an example of the differences in each basis. Therefore, it is important to do calculations progressing from basis to basis. The following present configurations in the three basis used displaing the minor differences. The literature values for N1-F2, N1-F3, N1-H4 are 1.3528, 1.3528, 1.024 respectfuly.
The models presented are built using the best ab initio level of theory. The highest level of theory which is the large DVZ basis set of the molecule.
Figure 1: NHF2 Molecule, Numbered Table 1: Bond lengths of NHF2 in each basis. Basis Type Bond Length Measurments (pm) |
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Bonds (pm) | 621G | 631G | DVZ |
N1-F2 | 140.3 | 142.6 | 140.3 |
N1-F3 | 140.3 | 142.6 | 140.3 |
N1-H4 | 100.7 | 101.5 | 100.7 |
The bond lengths vary from basis to basis which provides an example of the differences in each basis. Therefore, it is important to do calculations progressing from basis to basis. The following present configurations in the three basis used displaing the minor differences. The literature values for N1-F2, N1-F3, N1-H4 are 1.3528, 1.3528, 1.024 respectfuly.
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Bond lengths and Angles in 621G Basis
Bond lengths and Angles in 623G Basis |
Bond lengths and Angles in DVZ Basis |
The button LUMO will appear in the box below. Insert information for LUMO here and below.
Lowest Unoccupied Molecular Orbital |
Highest Occupied Molecular Orbital |
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Electrostatic Potential
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Partial Atomic Charges
Table 2: NHF2 frequencies and
intensities used to determine top 3 most occuring vibrational
configurations.
FREQUENCY: | IR INTENSITY: | |
1 | 25.87 | 0.75482 |
2 | 7.66 | 0.00815 |
3 | 2.73 | 0.01871 |
4 | 1.1 | 0.00176 |
5 | 3.11 | 0.00307 |
6 | 7.83 | 0.12393 |
7 | 527.28 | 0.16727 |
8 | 1068.34 | 0.8596 |
9 | 1082.15 | 3.7797 |
10 | 1371.56 | 1.56896 |
11 | 1591.77 | 0.20665 |
12 | 3726.92 | 0.2745 |
The vibrational configurations corisponding to the top 3 IR intensities are listed below.
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Vibrational Configuration at 1082 cm-1
Vibrational Configuration at 1371 cm-1 |
Vibrational Configuration at 1068 cm-1 |
Dipole moments at each level of theory for difluoroamine. The experimental value is 1.92 D. These values were relatively close to the experimental value found in the CRC Handbook.
Table 3: Dipole moments of
Difluoroamine
Theory Basis |
Dipole Moment (D) |
621G |
2.589398 |
631G |
2.693035 |
DZV |
2.699260 |
References:
(1) Lide, D. R., CRC Handbook of Chemistry and Physics, 77th Edition, CRC Press, 1996-1997
(2)http://webbook.nist.gov/. IR spectrum for P-xylene.
(3) Lide, D. R. CRC Handbook of Chemistry and Physics; CRC Press: Boca Raton, 1992.
(4) http://cccbdb.nist.gov/ experimental dipole moment of P-xylene
Hydrogen Fluorine
p-Xylene
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2011-08-06 04:51 on Mar 1, 2012.