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

using model chemistry: PBEPBE/6-31+G**

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 PBEPBE/6-31+G**
 hartrees
Energy at 0K-93.315672
Energy at 298.15K-93.315759
HF Energy-93.315672
Nuclear repulsion energy23.597888
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 PBEPBE/6-31+G**
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 3385 3346 59.02 36.12 0.23 0.38
2 Σ 2124 2099 0.35 50.54 0.15 0.26
3 Π 716 708 52.21 0.67 0.75 0.86
3 Π 716 708 52.21 0.67 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3469.9 cm-1
Scaled (by 0.9886) Zero Point Vibrational Energy (zpe) 3430.3 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 PBEPBE/6-31+G**
B
1.44478

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-31+G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.508
H2 0.000 0.000 -1.586
N3 0.000 0.000 0.662

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07881.1693
H21.07882.2481
N31.16932.2481

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 PBEPBE/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.074      
2 H 0.243      
3 N -0.318      


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 -2.981 2.981
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.908 0.000 0.000
y 0.000 -11.908 0.000
z 0.000 0.000 -9.867
Traceless
 xyz
x -1.020 0.000 0.000
y 0.000 -1.020 0.000
z 0.000 0.000 2.041
Polar
3z2-r24.082
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 1.571 0.000 0.000
y 0.000 1.571 0.000
z 0.000 0.000 3.487


<r2> (average value of r2) Å2
<r2> 14.140
(<r2>)1/2 3.760