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All results from a given calculation for Mg(OH)2 (Magnesium dihydroxide)

using model chemistry: HF/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 3 yes D*H 1Σg

Conformer 1 (C2H)

Jump to S1C2 S1C3
Vibrational Frequencies calculated at HF/3-21G*
Rotational Constants (cm-1) from geometry optimized at HF/3-21G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G*
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C2)

Jump to S1C1 S1C3
Energy calculated at HF/3-21G*
 hartrees
Energy at 0K-348.657228
Energy at 298.15K 
HF Energy-348.657228
Nuclear repulsion energy85.561038
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 HF/3-21G*
Rotational Constants (cm-1) from geometry optimized at HF/3-21G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G*
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 3 (D*H)

Jump to S1C1 S1C2
Energy calculated at HF/3-21G*
 hartrees
Energy at 0K-348.660554
Energy at 298.15K-348.662730
HF Energy-348.660554
Nuclear repulsion energy84.674154
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 HF/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 Σg 4068 3672 0.00      
2 Σg 710 641 0.00      
3 Σu 4069 3673 93.60      
4 Σu 1068 964 142.77      
5 Πg 354 319 0.00      
5 Πg 354 319 0.00      
6 Πu 374 337 482.64      
6 Πu 374 337 482.64      
7 Πu 185 167 16.66      
7 Πu 185 167 16.66      

Unscaled Zero Point Vibrational Energy (zpe) 5870.0 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 5298.2 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 HF/3-21G*
B
0.15493

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

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Mg1 0.000 0.000 0.000
O2 0.000 0.000 1.718
O3 0.000 0.000 -1.718
H4 0.000 0.000 2.669
H5 0.000 0.000 -2.669

Atom - Atom Distances (Å)
  Mg1 O2 O3 H4 H5
Mg11.71831.71832.66942.6694
O21.71833.43650.95114.3876
O31.71833.43654.38760.9511
H42.66940.95114.38765.3387
H52.66944.38760.95115.3387

picture of Magnesium dihydroxide state 1 conformation 3
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Mg1 O2 H4 180.000 Mg1 O3 H5 180.000
O2 Mg1 O3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Mg 0.950      
2 O -0.851      
3 O -0.851      
4 H 0.376      
5 H 0.376      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.985 0.000 0.000
y 0.000 -18.985 0.000
z 0.000 0.000 -16.517
Traceless
 xyz
x -1.234 0.000 0.000
y 0.000 -1.234 0.000
z 0.000 0.000 2.468
Polar
3z2-r24.936
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.809 0.000 0.000
y 0.000 1.809 0.000
z 0.000 0.000 3.376


<r2> (average value of r2) Å2
<r2> 72.834
(<r2>)1/2 8.534