return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: PBEPBEultrafine/6-31G(2df,p)

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 PBEPBEultrafine/6-31G(2df,p)
 hartrees
Energy at 0K-93.312824
Energy at 298.15K-93.312952
HF Energy-93.312824
Nuclear repulsion energy23.695244
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 PBEPBEultrafine/6-31G(2df,p)
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 3407 3372 48.63 30.84 0.25 0.41
2 Σ 2118 2097 0.46 35.99 0.20 0.33
3 Π 766 758 29.71 0.00 0.75 0.86
3 Π 766 758 29.71 0.00 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3528.3 cm-1
Scaled (by 0.9897) Zero Point Vibrational Energy (zpe) 3492.0 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 PBEPBEultrafine/6-31G(2df,p)
B
1.45674

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBEultrafine/6-31G(2df,p)

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.505
H2 0.000 0.000 -1.581
N3 0.000 0.000 0.659

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07571.1642
H21.07572.2400
N31.16422.2400

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 PBEPBEultrafine/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.018      
2 H 0.233      
3 N -0.215      


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 -2.801 2.801
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.392 0.000 0.000
y 0.000 -11.392 0.000
z 0.000 0.000 -9.529
Traceless
 xyz
x -0.932 0.000 0.000
y 0.000 -0.932 0.000
z 0.000 0.000 1.863
Polar
3z2-r23.726
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 1.445 0.000 0.000
y 0.000 1.445 0.000
z 0.000 0.000 3.025


<r2> (average value of r2) Å2
<r2> 13.799
(<r2>)1/2 3.715