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

using model chemistry: PBE1PBE/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 PBE1PBE/3-21G
 hartrees
Energy at 0K-92.791269
Energy at 298.15K-92.791484
HF Energy-92.791269
Nuclear repulsion energy23.802532
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 PBE1PBE/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 3513 3373 59.96 24.67 0.22 0.36
2 Σ 2192 2105 0.56 27.26 0.26 0.42
3 Π 909 873 59.10 0.06 0.75 0.86
3 Π 909 873 59.10 0.06 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3761.1 cm-1
Scaled (by 0.9604) Zero Point Vibrational Energy (zpe) 3612.1 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 PBE1PBE/3-21G
B
1.46985

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/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 -1.569
N3 0.000 0.000 0.656

Atom - Atom Distances (Å)
  C1 H2 N3
C11.06461.1603
H21.06462.2249
N31.16032.2249

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 PBE1PBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.070      
2 H 0.338      
3 N -0.408      


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 -2.785 2.785
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.427 0.000 0.000
y 0.000 -11.427 0.000
z 0.000 0.000 -9.945
Traceless
 xyz
x -0.741 0.000 0.000
y 0.000 -0.741 0.000
z 0.000 0.000 1.482
Polar
3z2-r22.963
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 0.918 0.000 0.000
y 0.000 0.918 0.000
z 0.000 0.000 2.714


<r2> (average value of r2) Å2
<r2> 13.828
(<r2>)1/2 3.719