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All results from a given calculation for CH3PHCH3 (dimethylphosphine)

using model chemistry: QCISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-418.654507
Energy at 298.15K-418.662191
HF Energy-418.362363
Nuclear repulsion energy109.838917
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/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 3027 11.99      
2 A' 3120 3024 23.21      
3 A' 3038 2944 16.01      
4 A' 2137 2071 102.10      
5 A' 1557 1509 6.22      
6 A' 1554 1506 13.29      
7 A' 1408 1365 0.54      
8 A' 1047 1015 26.49      
9 A' 1006 975 36.15      
10 A' 724 702 4.72      
11 A' 610 591 0.86      
12 A' 249 242 0.27      
13 A' 176 170 0.05      
14 A" 3123 3027 5.33      
15 A" 3120 3023 2.37      
16 A" 3039 2946 17.18      
17 A" 1547 1500 11.93      
18 A" 1544 1496 0.16      
19 A" 1389 1347 0.28      
20 A" 1042 1009 24.19      
21 A" 888 860 0.75      
22 A" 741 719 1.09      
23 A" 655 635 6.17      
24 A" 171 165 0.02      

Unscaled Zero Point Vibrational Energy (zpe) 18502.8 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 17932.9 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 QCISD/3-21G
ABC
0.49018 0.22039 0.16778

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
P1 -0.040 -0.702 0.000
H2 1.396 -0.957 0.000
C3 -0.040 0.560 1.464
C4 -0.040 0.560 -1.464
H5 -1.040 1.007 1.537
H6 -1.040 1.007 -1.537
H7 0.177 0.024 2.397
H8 0.177 0.024 -2.397
H9 0.704 1.352 1.314
H10 0.704 1.352 -1.314

Atom - Atom Distances (Å)
  P1 H2 C3 C4 H5 H6 H7 H8 H9 H10
P11.45831.93301.93302.50632.50632.51392.51392.54952.5495
H21.45832.55092.55093.48583.48582.86252.86252.74552.7455
C31.93302.55092.92871.09733.19501.09723.90441.09772.9831
C41.93302.55092.92873.19501.09733.90441.09722.98311.0977
H52.50633.48581.09733.19503.07431.78474.23361.79173.3596
H62.50633.48583.19501.09733.07434.23361.78473.35961.7917
H72.51392.86251.09723.90441.78474.23364.79401.79343.9763
H82.51392.86253.90441.09724.23361.78474.79403.97631.7934
H92.54952.74551.09772.98311.79173.35961.79343.97632.6272
H102.54952.74552.98311.09773.35961.79173.97631.79342.6272

picture of dimethylphosphine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
P1 C3 H5 108.427 P1 C3 H7 108.976
P1 C3 H9 111.548 P1 C4 H6 108.427
P1 C4 H8 108.976 P1 C4 H10 111.548
H2 P1 C3 96.557 H2 P1 C4 96.557
C3 P1 C4 98.497 H5 C3 H7 108.825
H5 C3 H9 109.430 H6 C4 H8 108.825
H6 C4 H10 109.430 H7 C3 H9 109.584
H8 C4 H10 109.584
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability