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All results from a given calculation for C4N2 (2-Butynedinitrile)

using model chemistry: B1B95/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at B1B95/3-21G*
 hartrees
Energy at 0K-260.279815
Energy at 298.15K-260.278580
Nuclear repulsion energy143.977251
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 B1B95/3-21G*
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 2443 2333 0.00      
2 Σg 2233 2132 0.00      
3 Σg 626 598 0.00      
4 Σu 2366 2259 3.67      
5 Σu 1203 1149 0.07      
6 Πg 950 907 0.00      
6 Πg 950 907 0.00      
7 Πg 353 337 0.00      
7 Πg 353 337 0.00      
8 Πu 714 682 1.71      
8 Πu 714 682 1.71      
9 Πu 123 117 6.57      
9 Πu 123 117 6.57      

Unscaled Zero Point Vibrational Energy (zpe) 6575.3 cm-1
Scaled (by 0.9549) Zero Point Vibrational Energy (zpe) 6278.8 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 B1B95/3-21G*
B
0.04491

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.606
C2 0.000 0.000 -0.606
C3 0.000 0.000 1.961
C4 0.000 0.000 -1.961
N5 0.000 0.000 3.129
N6 0.000 0.000 -3.129

Atom - Atom Distances (Å)
  C1 C2 C3 C4 N5 N6
C11.21151.35522.56672.52363.7351
C21.21152.56671.35523.73512.5236
C31.35522.56673.92181.16845.0902
C42.56671.35523.92185.09021.1684
N52.52363.73511.16845.09026.2586
N63.73512.52365.09021.16846.2586

picture of 2-Butynedinitrile state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C4 180.000 C1 C3 N5 180.000
C2 C1 C3 180.000 C2 C4 N6 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.229      
2 C 0.229      
3 C 0.211      
4 C 0.211      
5 N -0.440      
6 N -0.440      


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 -31.652 0.000 0.000
y 0.000 -31.652 0.000
z 0.000 0.000 -48.539
Traceless
 xyz
x 8.444 0.000 0.000
y 0.000 8.444 0.000
z 0.000 0.000 -16.887
Polar
3z2-r2-33.775
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 2.156 0.000 0.000
y 0.000 2.156 0.000
z 0.000 0.000 16.268


<r2> (average value of r2) Å2
<r2> 210.926
(<r2>)1/2 14.523