CH- ion, (see note*)

H1 - C2
The ion charge is -1.

Tell me about the atomic charges, dipole moment, bond lengths, angles, bond orders,
molecular orbital energies, or total energy.
Tell me about the best Lewis structure.

Atomic Charges and Dipole Moment

H1 charge= 0.171
C2 charge=-1.171
with a dipole moment of 1.64214 Debye

Bond Lengths:

between H1 and C2: distance=1.159 ang___

Bond Orders (Mulliken):

between H1 and C2: order=0.882___

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Best Lewis Structure

The Lewis structure that is closest to your structure is determined. The hybridization of the atoms in this idealized Lewis structure is given in the table below.

Hybridization in the Best Lewis Structure

1. A bonding orbital for H1-C2 with 2.0000 electrons
__has 52.28% H 1 character in a s orbital
__has 47.72% C 2 character in a s0.68 p3 hybrid

3. A lone pair orbital for C2 with 1.9993 electrons
__made from a p-pi orbital ( 99.97% p)

4. A lone pair orbital for C2 with 1.9990 electrons
__made from a sp0.22 hybrid

-With core pairs on: C 2 -

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Molecular Orbital Energies

The orbital energies are given in eV, where 1 eV=96.49 kJ/mol. Orbitals with very low energy are core 1s orbitals. More antibonding orbitals than you might expect are sometimes listed, because d orbitals are always included for heavy atoms and p orbitals are included for H atoms. Up spins are shown with a ^ and down spins are shown as v.

8 ----- 11.04
7 ----- 10.42
6 ----- 9.697

5 ----- 2.962

4 -^-v- 3.786

3 -^-v- 0.996


2 -^-v- -6.600


1 -^-v- -259.6

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Total Electronic Energy

The total electronic energy is a very large number, so by convention the units are given in atomic units, that is Hartrees (H). One Hartree is 2625.5 kJ/mol. The energy reference is for totally dissociated atoms. In other words, the reference state is a gas consisting of nuclei and electrons all at infinite distance from each other. The electronic energy includes all electric interactions and the kinetic energy of the electrons. This energy does not include translation, rotation, or vibration of the the molecule.

Total electronic energy = -38.4775360326 Hartrees

Note: This singlet state is higher in energy than the triplet state CH- triplet ion.

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