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All results from a given calculation for HCN (Hydrogen cyanide)

using model chemistry: mPW1PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 1Σ
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-92.875592
Energy at 298.15K-92.875806
HF Energy-92.875592
Nuclear repulsion energy23.824518
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 mPW1PW91/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 3520 3342 59.85 24.42 0.22 0.36
2 Σ 2195 2084 0.60 27.15 0.26 0.41
3 Π 910 865 59.48 0.08 0.75 0.86
3 Π 910 865 59.48 0.08 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3767.5 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 3577.6 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 mPW1PW91/3-21G*
B
1.47256

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.504
H2 0.000 0.000 -1.567
N3 0.000 0.000 0.656

Atom - Atom Distances (Å)
  C1 H2 N3
C11.06321.1593
H21.06322.2225
N31.15932.2225

picture of Hydrogen cyanide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 N3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.069      
2 H 0.339      
3 N -0.409      


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 -2.794 2.794
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.405 0.000 0.000
y 0.000 -11.405 0.000
z 0.000 0.000 -9.927
Traceless
 xyz
x -0.739 0.000 0.000
y 0.000 -0.739 0.000
z 0.000 0.000 1.478
Polar
3z2-r22.955
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 0.917 0.000 0.000
y 0.000 0.917 0.000
z 0.000 0.000 2.706


<r2> (average value of r2) Å2
<r2> 13.802
(<r2>)1/2 3.715