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

using model chemistry: B1B95/6-31G**

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 B1B95/6-31G**
 hartrees
Energy at 0K-261.722092
Energy at 298.15K-261.720175
Nuclear repulsion energy143.592544
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 B1B95/6-31G**
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 2422 2313 0.00      
2 Σg 2248 2146 0.00      
3 Σg 625 597 0.00      
4 Σu 2383 2275 10.18      
5 Σu 1206 1151 0.00      
6 Πg 559 534 0.00      
6 Πg 559 534 0.00      
7 Πg 292 279 0.00      
7 Πg 292 279 0.00      
8 Πu 522 499 5.27      
8 Πu 522 499 5.27      
9 Πu 120 114 10.18      
9 Πu 120 114 10.18      

Unscaled Zero Point Vibrational Energy (zpe) 5935.4 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 5667.1 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 B1B95/6-31G**
B
0.04459

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31G**

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.607
C2 0.000 0.000 -0.607
C3 0.000 0.000 1.973
C4 0.000 0.000 -1.973
N5 0.000 0.000 3.138
N6 0.000 0.000 -3.138

Atom - Atom Distances (Å)
  C1 C2 C3 C4 N5 N6
C11.21471.36582.58052.53073.7454
C21.21472.58051.36583.74542.5307
C31.36582.58053.94631.16495.1112
C42.58051.36583.94635.11121.1649
N52.53073.74541.16495.11126.2760
N63.74542.53075.11121.16496.2760

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 B1B95/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.395      
2 C 0.395      
3 C 0.020      
4 C 0.020      
5 N -0.415      
6 N -0.415      


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 -31.090 0.000 0.000
y 0.000 -31.090 0.000
z 0.000 0.000 -48.948
Traceless
 xyz
x 8.929 0.000 0.000
y 0.000 8.929 0.000
z 0.000 0.000 -17.858
Polar
3z2-r2-35.716
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 2.811 0.000 0.000
y 0.000 2.811 0.000
z 0.000 0.000 17.612


<r2> (average value of r2) Å2
<r2> 212.142
(<r2>)1/2 14.565