return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CCH (propyne)

using model chemistry: M06-2X/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at M06-2X/3-21G
 hartrees
Energy at 0K-115.956712
Energy at 298.15K 
HF Energy-115.956712
Nuclear repulsion energy58.618829
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 M06-2X/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 A1 3529 3383 55.55 29.63 0.18 0.31
2 A1 3084 2957 5.52 141.92 0.00 0.01
3 A1 2288 2193 1.29 67.52 0.33 0.50
4 A1 1476 1415 2.92 22.95 0.58 0.73
5 A1 937 899 1.67 3.17 0.23 0.37
6 E 3149 3019 3.96 73.63 0.75 0.86
6 E 3149 3019 3.88 73.62 0.75 0.86
7 E 1553 1489 10.22 23.39 0.75 0.86
7 E 1553 1489 10.23 23.40 0.75 0.86
8 E 1112 1066 5.54 0.07 0.75 0.86
8 E 1112 1066 5.53 0.07 0.75 0.86
9 E 792 759 47.57 1.66 0.75 0.86
9 E 792 759 47.58 1.66 0.75 0.86
10 E 366 351 13.35 10.94 0.75 0.86
10 E 366 351 13.34 11.01 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12628.7 cm-1
Scaled (by 0.9587) Zero Point Vibrational Energy (zpe) 12107.1 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 M06-2X/3-21G
ABC
5.30638 0.28442 0.28442

See section I.F.4 to change rotational constant units
Geometric Data calculated at M06-2X/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.245
C2 0.000 0.000 0.221
C3 0.000 0.000 1.425
H4 0.000 0.000 2.487
H5 0.000 1.025 -1.629
H6 0.888 -0.513 -1.629
H7 -0.888 -0.513 -1.629

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46612.67053.73221.09461.09461.0946
C21.46611.20442.26612.11492.11492.1149
C32.67051.20441.06183.22173.22173.2217
H43.73222.26611.06184.24184.24184.2418
H51.09462.11493.22174.24181.77541.7754
H61.09462.11493.22174.24181.77541.7754
H71.09462.11493.22174.24181.77541.7754

picture of propyne state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 180.000 C2 C1 H5 110.528
C2 C1 H6 110.528 C2 C1 H7 110.528
C2 C3 H4 180.000 H5 C1 H6 108.394
H5 C1 H7 108.394 H6 C1 H7 108.394
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at M06-2X/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.639      
2 C 0.037      
3 C -0.383      
4 H 0.261      
5 H 0.241      
6 H 0.241      
7 H 0.241      


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 -0.716 0.716
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.528 0.000 0.000
y 0.000 -19.528 0.000
z 0.000 0.000 -13.534
Traceless
 xyz
x -2.997 0.000 0.000
y 0.000 -2.997 0.000
z 0.000 0.000 5.994
Polar
3z2-r211.989
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 2.250 0.000 0.000
y 0.000 2.253 -0.002
z 0.000 -0.002 6.146


<r2> (average value of r2) Å2
<r2> 50.031
(<r2>)1/2 7.073