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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: G4

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 G4
 hartrees
Energy at 0K-2650.316816
Energy at 298.15K-2650.312250
HF Energy-2650.598222
Nuclear repulsion energy123.963063
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 B3LYP/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 3520 3397 98.01      
2 Σ 2207 2130 17.69      
3 Σ 630 608 1.30      
4 Π 650 628 43.85      
4 Π 650 628 43.85      
5 Π 356 343 4.80      
5 Π 356 343 4.80      

Unscaled Zero Point Vibrational Energy (zpe) 4184.2 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 4037.7 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 B3LYP/6-31G(2df,p)
B
0.13583

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G(2df,p)

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.294
C2 0.000 0.000 -1.093
Br3 0.000 0.000 0.677
H4 0.000 0.000 -3.356

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.20142.97071.0615
C21.20141.76932.2628
Br32.97071.76934.0321
H41.06152.26284.0321

picture of bromoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br3 180.000 C2 C1 H4 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.494      
2 C 0.091      
3 Br 0.188      
4 H 0.216      


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 -0.291 0.291
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 83.131
(<r2>)1/2 9.118