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All results from a given calculation for HCCN (cyanomethylene)

using model chemistry: QCISD(TQ)/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 3A"
Energy calculated at QCISD(TQ)/cc-pVDZ
 hartrees
Energy at 0K-131.076584
Energy at 298.15K-131.075974
HF Energy-130.690802
Nuclear repulsion energy46.455309
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 QCISD(TQ)/cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3325 3325        
2 A' 1831 1831        
3 A' 1134 1134        
4 A' 661 661        
5 A' 380 380        
6 A" 413 413        

Unscaled Zero Point Vibrational Energy (zpe) 3871.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 3871.4 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 QCISD(TQ)/cc-pVDZ
ABC
45.99984 0.35536 0.35264

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(TQ)/cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.079 -1.257 0.000
C2 0.000 0.095 0.000
N3 -0.182 1.291 0.000
H4 0.805 -2.069 0.000

Atom - Atom Distances (Å)
  C1 C2 N3 H4
C11.35432.56181.0891
C21.35431.21022.3087
N32.56181.21023.5022
H41.08912.30873.5022

picture of cyanomethylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 174.663 C2 C1 H4 141.526
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability