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All results from a given calculation for Li2S (dilithium sulfide)

using model chemistry: QCISD(TQ)=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no D*H 1Σg
1 2 yes C2V 1A1

Conformer 1 (D*H)

Jump to S1C2
Energy calculated at QCISD(TQ)=FULL/6-31G*
 hartrees
Energy at 0K-412.649740
Energy at 298.15K 
HF Energy-412.479997
Nuclear repulsion energy25.411029
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(TQ)=FULL/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 590 590        
2 Σu 654 654        
3 Πu 26i 26i        
3 Πu 26i 26i        

Unscaled Zero Point Vibrational Energy (zpe) 596.1 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 596.1 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(TQ)=FULL/6-31G*
B
0.27432

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(TQ)=FULL/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.000
Li2 0.000 0.000 2.093
Li3 0.000 0.000 -2.093

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.09272.0927
Li22.09274.1854
Li32.09274.1854

picture of dilithium sulfide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Li2 S1 Li3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at QCISD(TQ)=FULL/6-31G*
 hartrees
Energy at 0K-412.652698
Energy at 298.15K-412.653059
HF Energy-412.478564
Nuclear repulsion energy25.330605
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(TQ)=FULL/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 588 588        
2 A1 138 138        
3 B2 633 633        

Unscaled Zero Point Vibrational Energy (zpe) 679.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 679.7 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 QCISD(TQ)=FULL/6-31G*
ABC
1.20849 0.39241 0.29622

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(TQ)=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.326
Li2 0.000 1.750 -0.870
Li3 0.000 -1.750 -0.870

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.11942.1194
Li22.11943.4994
Li32.11943.4994

picture of dilithium sulfide state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Li2 S1 Li3 111.292
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability